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Faculty of Engineering - Papers (Archive)

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Full-Text Articles in Engineering

Effects Of Membrane Fouling On N-Nitrosamine Rejection By Nanofiltration And Reverse Osmosis Membranes, Takahiro Fujioka, Stuart J. Khan, James A. Mcdonald, Rita K. Henderson, Yvan Poussade, Jorg E. Drewes, Long Nghiem Jan 2013

Effects Of Membrane Fouling On N-Nitrosamine Rejection By Nanofiltration And Reverse Osmosis Membranes, Takahiro Fujioka, Stuart J. Khan, James A. Mcdonald, Rita K. Henderson, Yvan Poussade, Jorg E. Drewes, Long Nghiem

Faculty of Engineering - Papers (Archive)

The impact of fouling on N-nitrosamine rejection by nanofiltration (NF) and reverse osmosis (RO) membranes was investigated in this study. Membrane fouling was simulated using tertiary treated effluent and several model fouling solutions (that contained sodium alginate, bovine serum albumin, humic acid or colloidal silica) to elucidate the changes in rejection behaviour of N-nitrosamines. In general, the rejection of N-nitrosamines increased when the membranes were fouled by tertiary effluent. The rejection of small molecular weight N-nitrosamines was most affected by membrane fouling. In particular, the rejection of N-nitrosodimethylamine (NDMA) by the ESPA2 membrane increased from 34 to 73% after membrane ...


Stabilization Of Nazn(Bh4)3 Via Nanoconfinement In Sba-15 Towards Enhanced Hydrogen Release, Guanglin Xia, Li Li, Zaiping Guo, Qinfen Gu, Yanhui Guo, Xuebin Yu, Hua-Kun Liu, Zongwen Liu Jan 2013

Stabilization Of Nazn(Bh4)3 Via Nanoconfinement In Sba-15 Towards Enhanced Hydrogen Release, Guanglin Xia, Li Li, Zaiping Guo, Qinfen Gu, Yanhui Guo, Xuebin Yu, Hua-Kun Liu, Zongwen Liu

Faculty of Engineering - Papers (Archive)

In the present work, the decomposition behaviour of NaZn(BH4)3 nanoconfined in mesoporous SBA-15 has been investigated in detail and compared to bulk NaZn(BH4)3 that was ball milled with SBA-15, but not nanoconfined. The successful incorporation of nanoconfined NaZn(BH4)3 into mesopores of SBA-15 was confirmed by scanning electron microscopy, transmission electron microscopy, energy dispersive X-ray spectroscopy, 11B nuclear magnetic resonance, nitrogen absorption/desorption isotherms, and Fourier transform infrared spectroscopy measurements. It is demonstrated that the dehydrogenation of the space-confined NaZn(BH4)3 is free of emission of boric by-products, and significantly improved hydrogen release kinetics ...


Effect Of Eccentric Load On Retrofitted Reinforced Concrete Columns Confined With Frp, Thong M. Pham, X Lei, Muhammad N. S Hadi Jan 2013

Effect Of Eccentric Load On Retrofitted Reinforced Concrete Columns Confined With Frp, Thong M. Pham, X Lei, Muhammad N. S Hadi

Faculty of Engineering - Papers (Archive)

Different behaviour of diverse sections of confined Reinforced Concrete (RC) columns under eccentric load is investigated in this study. Three types of sections are considered, which include square columns, square with rounded corners and modified circular columns. Twelve reinforced square concrete columns were made from normal strength concrete and subdivided into four groups. The first three columns were the Reference Group and had no modification.The next three columnswere modified with round corners and wrapped with three layers of Carbon Fibre Reinforced Polymer (CFRP), another three were bonded with four pieces of segmental circular concrete covers and wrapped with three ...


Effect Of Ply Configuration On Hollow Square Reinforced Concrete Columns Confined With Carbon Fibre-Reinforced Polymer (Cfrp), T D. Le, M T. Lester, Muhammad N. S Hadi Jan 2013

Effect Of Ply Configuration On Hollow Square Reinforced Concrete Columns Confined With Carbon Fibre-Reinforced Polymer (Cfrp), T D. Le, M T. Lester, Muhammad N. S Hadi

Faculty of Engineering - Papers (Archive)

This paper presents results of testing twelve hollow square reinforced concrete specimens wrapped with Carbon fibre reinforced polymer CFRP. The effect of ply configuration on the behaviour of the specimens is investigated. All specimens were 800mm high and had the dimensions of 200mm×200mm in cross-section and a hollow core of 80mm×80 mm. The specimens were divided into four groups with three specimens each. The specimens in the first group without bonding CFRP served as references. While the remaining three groups of specimens were externally wrapped with CFRP in three different ply configurations of hoop, vertical and 45◦ angle ...


An Elasto-Plastic Model For Liquefiable Sands Subjected To Torsional Shear Loadings, Gabriele Chiaro, Junichi Koseki, Nalin L. I De Silva Jan 2013

An Elasto-Plastic Model For Liquefiable Sands Subjected To Torsional Shear Loadings, Gabriele Chiaro, Junichi Koseki, Nalin L. I De Silva

Faculty of Engineering - Papers (Archive)

This paper presents a modeling procedure for simulating the monotonic undrained torsional shear behavior of sands, including stress-strain relationship, and excess pore water pressure generation, while considering the void ratio and stress level dependence of stress-strain-dilatancy behavior of sand. A unique set of soil parameters is required by the model to satisfactorily predict the undrained behavior of loose and dense Toyoura sand over a wide range of initial void ratios and confining pressures, as proven by simulating experimental data produced by the authors and found in the literature.


Influence Of Ti/N Ratio On Simulated Cghaz Microstructure And Toughness In X70 Steels, Z X. Zhu, M Marimuthu, L Kuzmikova, H J. Li, F Barbaro, L Zheng, M Z. Bai, C Jones Jan 2013

Influence Of Ti/N Ratio On Simulated Cghaz Microstructure And Toughness In X70 Steels, Z X. Zhu, M Marimuthu, L Kuzmikova, H J. Li, F Barbaro, L Zheng, M Z. Bai, C Jones

Faculty of Engineering - Papers (Archive)

Three API 5L X70 steels with different Ti and N contents and otherwise identical chemistry were selected to investigate the effect of Ti/N ratio on the toughness in coarse grained heat affected zone (CGHAZ). A Gleeble 3500 thermomechanical simulator was used to simulate the thermal profile of CGHAZ of double submerged arc welding process. The microstructure was examined by optical microscopy. Statistics of CGHAZ grain coarsening were compiled by measuring the prior austenite grain size. Toughness of the simulated CGHAZ regions was evaluated by Charpy V-notch testing at -20 and -40°C. Morphology of the impact fracture surface was ...


Microstructure Evolution And Alloying Elements Distribution Between The Phases In Powder Near-B Titanium Alloys During Thermo-Mechanical Processing, Mansur Ahmed, Azdiar A. Gazder, Dmytro G. Savvakin, Orest M. Ivasishin, E V. Pereloma Jun 2012

Microstructure Evolution And Alloying Elements Distribution Between The Phases In Powder Near-B Titanium Alloys During Thermo-Mechanical Processing, Mansur Ahmed, Azdiar A. Gazder, Dmytro G. Savvakin, Orest M. Ivasishin, E V. Pereloma

Faculty of Engineering - Papers (Archive)

In the present study, two powders near-β Ti alloys having a nominal composition of Ti-5Al-5Mo-5V-XCr-1Fe (X = 1–2, wt%) were studied. The alloys were produced via the blended elemental powder metallurgy technique using hydrogenated Ti powder. Microstructure evolution and the distribution of the alloying elements between the phases were investigated after each step of thermo-mechanical processing (TMP). Microstructures were refined through the TMP in both alloys. Porosity was reduced with deformation at 1173 K (900 °C) in the β phase field. The β → α phase transformation occurred during soaking at 1023 K (750 °C) in the α + β phase field ...


Development Of Reliability-Based Design For Railway Prestressed Concrete Sleepers, Sakdirat Kaewunruen, Alexander Remennikov, Martin H. Murray May 2012

Development Of Reliability-Based Design For Railway Prestressed Concrete Sleepers, Sakdirat Kaewunruen, Alexander Remennikov, Martin H. Murray

Faculty of Engineering - Papers (Archive)

Faster and heavier train services are a driven improvement aspect for leaner and more profitable transport logistics of either passengers or freights. Ballasted rail track has been adopted for modern railways because of its many superior advantages in design, construction, short- and long-term maintenance, sustainability, financial capital and life cycle cost. An important element of the railway track system, which distributes the wheel load to the formation and holds the rail gauge, is the railway sleeper. Field data has raised concerns about design techniques for prestressed concrete (PC) sleepers. Most current design codes for these rely on allowable stresses and ...


High Strength Thin-Walled Rectangular Concrete-Filled Tubular Slender Beam-Columns, Part Ii: Behaviour, Muhammad N. S Hadi, Qing Quan Liang, Vipulkumar I. Patel Jan 2012

High Strength Thin-Walled Rectangular Concrete-Filled Tubular Slender Beam-Columns, Part Ii: Behaviour, Muhammad N. S Hadi, Qing Quan Liang, Vipulkumar I. Patel

Faculty of Engineering - Papers (Archive)

Experimental and numerical research on full-scale high strength thin-walled rectangular steel slender tubes filled with high strength concrete has not been reported in the literature. In a companion paper, a new numerical model was presented that simulates the nonlinear inelastic behavior of uniaxially loaded high strength thin-walled rectangular concrete-filled steel tubular (CFST) slender beam-columns with local buckling effects. The progressive local and post-local buckling of thin steel tube walls under stress gradients was incorporated in the numerical model. This paper presents the verification of the numerical model developed and its applications to the investigation into the fundamental behavior of high ...


Effect Of Grain Size On The Hydrogen Diffusion Process In Steel Using Cellular Automaton Approach, Druce P. Dunne, E V. Pereloma, Nima Yazdipour Jan 2012

Effect Of Grain Size On The Hydrogen Diffusion Process In Steel Using Cellular Automaton Approach, Druce P. Dunne, E V. Pereloma, Nima Yazdipour

Faculty of Engineering - Papers (Archive)

The role of microstructure in susceptibility to hydrogen uptake and property degradation is being evaluated using a number of high strength pipeline steels. To do so, a cellular automaton (CA) model has been used to examine the effect of grain size, as a first step in assessing the influence of microstructure. The simulation results of hydrogen diffusion into microstructures with different grain sizes are presented.


Net Section Tension Capacity Of Bolted Connections In Cold-Reduced Steel Sheets, Lip H. Teh, Benoit P. Gilbert Jan 2012

Net Section Tension Capacity Of Bolted Connections In Cold-Reduced Steel Sheets, Lip H. Teh, Benoit P. Gilbert

Faculty of Engineering - Papers (Archive)

This paper examines the accuracy of design equations specified in the North American, European and Australasian codes for coldformed steel structures in determining the net section tension capacity of bolted connections in flat steel sheets. It points out that the shear lag factors embedded in the code equations either yield “anomalous” results or become irrelevant when they exceed unity. The “anomaly” was demonstrated through laboratory tests and is explained by using simple calculus. The configurations of specimens tested in the laboratory include single shear- and double-shear connections, with single or double bolts in a line parallel or perpendicular to the ...


Numerical Prediction Of Unsaturated Ground Behavior Influenced By Vegetation And Vacuum Consolidation, Cholachat Rujikiatkamjorn, Buddhima Indraratna, B Fatahi Jan 2012

Numerical Prediction Of Unsaturated Ground Behavior Influenced By Vegetation And Vacuum Consolidation, Cholachat Rujikiatkamjorn, Buddhima Indraratna, B Fatahi

Faculty of Engineering - Papers (Archive)

Bioengineering including native vegetation is an ancient method of improving the stability of slopes. In modern railway engineering, this technique is re-captured for increasing the soil stiffness and shear strength of subgrade beneath rail tracks. Currently this practice has become increasingly popular in Australia for stabilising railway corridors built over expansive clays and compressive soft soils. This paper looks at the stabilisation role by suction generated by both the natural vegetation and the artificial vacuum application using the numerical analysis. For demonstrating the role of native vegetation, a mathematical model for the rate of root water uptake was incorporated in ...


Effect Of Compaction Energy On Shear Wave Velocity Of Dynamically Compacted Silty Sand Soil, Buddhima Indraratna, Ana Heitor, Cholachat Rujikiatkamjorn Jan 2012

Effect Of Compaction Energy On Shear Wave Velocity Of Dynamically Compacted Silty Sand Soil, Buddhima Indraratna, Ana Heitor, Cholachat Rujikiatkamjorn

Faculty of Engineering - Papers (Archive)

This study was focused on the effects of compaction energy on the dynamic properties of a silty sand in its as-compacted state in relation to the measured values of matric suction. The influence of the imparted energy on the shear wave velocity and the small-strain shear modulus of the compacted soil was studied for three different energy levels that correspond to the standard Proctor as well as reduced and enhanced. The specimens were prepared with moisture contents ranging from the dry to wet of optimum, and subsequently compacted to known dry unit weights for which the corresponding matric suction and ...


Carbothermal Reduction And Nitridation Of Ilmenite Concentrates, Sheikh Abdul Rezan, Guangqing Zhang, Oleg Ostrovski Jan 2012

Carbothermal Reduction And Nitridation Of Ilmenite Concentrates, Sheikh Abdul Rezan, Guangqing Zhang, Oleg Ostrovski

Faculty of Engineering - Papers (Archive)

Carbothermal reduction and nitridation of ilmenite concentrates of different grades and synthetic rutile were studied in isothermal experiments in hydrogen – nitrogen gas atmosphere and pure nitrogen in a tube reactor. Concentrations of CO and CO2 in the off gas were measured online using infrared gas analyser. The reaction products were analysed by X-ray diffraction. Iron oxides in ilmenite concentrates were reduced to metallic iron, and titanium oxides were converted to titanium oxycarbonitride. Reduction of ilmenite concentrates and synthetic rutile in hydrogen containing gas was significantly faster than in pure nitrogen. The rate of conversion of titania to titanium oxycarbonitride in ...


Effect Of Gas Atmosphere On Carbothermal Reduction And Nitridation Of Titanium Dioxide, Sheikh A. Rezan, Guangqing Zhang, Oleg Ostrovski Jan 2012

Effect Of Gas Atmosphere On Carbothermal Reduction And Nitridation Of Titanium Dioxide, Sheikh A. Rezan, Guangqing Zhang, Oleg Ostrovski

Faculty of Engineering - Papers (Archive)

This article examined the reduction/nitridation of rutile in the He-N2, Ar-N2, and He (Ar)-H2- N2 gas mixtures, as well as pure nitrogen, in the temperature-programmed and isothermal experiments in a fixed-bed reactor. The extents of reduction and nitridation were determined from the off gas composition and LECO analysis. The off-gas composition was monitored using the infrared sensor (CO, CO2, and CH4) and dew point analyzer (H2O). The phase composition of the reduced samples was analyzed using X-ray diffraction (XRD). The temperature and gas composition had a strong effect on the rutile reduction. The reduction was the fastest in ...


Limit States Design Of Railway Concrete Sleepers, Sakdirat Kaewunruen, Alexander Remennikov, Martin H. Murray Jan 2012

Limit States Design Of Railway Concrete Sleepers, Sakdirat Kaewunruen, Alexander Remennikov, Martin H. Murray

Faculty of Engineering - Papers (Archive)

The recently updated information has raised a concern in not only the existing costineffective design method but also the unrealistic analysis mode of railroad prestressed concrete sleepers. Because of the deficient knowledge in the past, railway civil engineers have been mostly aware of the over conservative design methods for structural components in any railway track, which rely on allowable stresses and material strength reductions. Based on a number of proven experiments and field data, it is believed that the concrete sleepers complied with the allowable stress concept possess the unduly untapped fracture toughness. A collaborative research run by the Australian ...


Removal Of Trace Organic Contaminants By A Membrane Bioreactor-Granular Activated Carbon (Mbr -Gac) System, Luong N. Nguyen, Faisal I. Hai, Jinguo Kang, William E. Price, Long Nghiem Jan 2012

Removal Of Trace Organic Contaminants By A Membrane Bioreactor-Granular Activated Carbon (Mbr -Gac) System, Luong N. Nguyen, Faisal I. Hai, Jinguo Kang, William E. Price, Long Nghiem

Faculty of Engineering - Papers (Archive)

The removal of trace organics by a membrane bioreactor–granular activated carbon (MBR–GAC) integrated system were investigated. The results confirmed that MBR treatment can be effective for the removal of hydrophobic (logD > 3.2) and readily biodegradable trace organics. The data also highlighted the limitation of MBR in removing hydrophilic and persistent compounds (e.g. carbamazepine, diclofenac, and fenoprop) and that GAC could complement MBR very well as a post-treatment process. The MBR– GAC system showed high removal of all selected trace organics including those that are hydrophilic and persistent to biological degradation at up to 406 bed volumes ...


Permeable Reactive Barrier (Prb) Technology For The Remediation Of Acidic Groundwater From Acid Sulphate Soil Floodplain In South East New South Wales, L J. Banasiak, B Indraratna, A. Golab Jan 2012

Permeable Reactive Barrier (Prb) Technology For The Remediation Of Acidic Groundwater From Acid Sulphate Soil Floodplain In South East New South Wales, L J. Banasiak, B Indraratna, A. Golab

Faculty of Engineering - Papers (Archive)

The release of acidic water contaminated with toxic metals such as aluminium (Al) and iron (Fe) resulting from pyrite oxidation within acid sulphate soils (ASSs) is a major environmental issue in Australia. Groundwater manipulation using weirs and modified floodgates is not effective in low-lying floodplains due to the high risk of flooding and their inability to prevent pyrite oxidation. Permeable reactive barrier (PRB) technology has been looked at as an alternative remediation technique in ASS terrain. Batch and short-term column tests were used to choose a suitable reactive material for the remediation of acidic water and the removal of Al ...


Performance Of Cfrp Wrapped Square Reinforced Concrete Columns Subjected To Eccentric Loading, Ida Bagus Rai Widiarsa, Muhammad N. S Hadi Jan 2012

Performance Of Cfrp Wrapped Square Reinforced Concrete Columns Subjected To Eccentric Loading, Ida Bagus Rai Widiarsa, Muhammad N. S Hadi

Faculty of Engineering - Papers (Archive)

Strengthening concrete columns with fibre-reinforced polymer (FRP) has been tudied extensively, but the majority of published tudies have focllsed on circular column. Most concrete columns in the field have square 01' r ctangul3r cross ections and resist ecc nt.ric loading as well. The objective of this study i to investigate the performance of square reinforced concrete (RC) columns wrapped with carbon FRP subjected to eccentric Loading. The influence of two parameters was studied including the number of FRP layers and the magnitude of eccentricity. Compression testing was conducted on twe Ive short quare RC columns wrapped with CFRP composites ...


Probing And Modelling The Localized Self-Mixing In A Gan/Algan Field-Effect Terahertz Detector, J D. Sun, H Qin, R A. Lewis, Y F. Sun, X Y. Zhang, Y Cai, D M. Wu, B S. Zhang Jan 2012

Probing And Modelling The Localized Self-Mixing In A Gan/Algan Field-Effect Terahertz Detector, J D. Sun, H Qin, R A. Lewis, Y F. Sun, X Y. Zhang, Y Cai, D M. Wu, B S. Zhang

Faculty of Engineering - Papers (Archive)

In our previous work, we inferred the existence of localized self-mixing in an antenna-coupled field-effect terahertz detector. In this Letter, we report a quasistatic self-mixing model taking into account the localized terahertz fields and its verification by comparing the simulated results with the experimental data in a two-dimensional space of the gate voltage and the drain/source bias. The model well describes the detector characteristics: not only the magnitude, but also the polarity, of the photocurrent can be tuned. The existence of strongly localized self-mixing in such detectors is confirmed.


Pesticide Removal By A Mixed Culture Of Bacteria And White-Rot Fungi, Faisal I. Hai, Oska Modin, Kazuo Yamamoto, Kensuke Fukushi, Fumiyuki Nakajiam, Long Nghiem Jan 2012

Pesticide Removal By A Mixed Culture Of Bacteria And White-Rot Fungi, Faisal I. Hai, Oska Modin, Kazuo Yamamoto, Kensuke Fukushi, Fumiyuki Nakajiam, Long Nghiem

Faculty of Engineering - Papers (Archive)

Combining activated sludge cultures with microbes harboring specific degradation pathways could constitute a relevant process for the removal of toxic and recalcitrant organic substances from wastewater. Enhanced removal of three widely used recalcitrant pesticides from their liquid mixture was demonstrated by implementing a non-acclimated mixed culture of bacteria and white-rot fungus. During an incubation period of 14 days, the mixed fungus–bacteria culture achieved 47, 98, and 62% removal of aldicarb, atrazine and alachlor from the liquid phase, respectively. This compared favorably to batches containing only non-acclimated fungus or previously published removal rates with nonacclimated bacterial cultures. Biosorption along with ...


Indoor Localisation Using A Context-Aware Dynamic Position Tracking Model, Montserrat Ros, Joshua Boom, Gavin De Hosson, Matthew D'Souza Jan 2012

Indoor Localisation Using A Context-Aware Dynamic Position Tracking Model, Montserrat Ros, Joshua Boom, Gavin De Hosson, Matthew D'Souza

Faculty of Engineering - Papers (Archive)

This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Indoor wireless localisation is a widely sought feature for use in logistics, health, and social networking applications. Low-powered localisation will become important for the next generation of pervasive media applications that operate on mobile platforms. We present an inexpensive and robust context-aware tracking system that can track the position of users in an indoor environment, using a wireless smart meter network. Our context-aware tracking system combines wireless trilateration with a ...


Illustrative Sections Depicting Landslide Susceptibility Of The Illawarra Escarpment, Andrew Leventhal, Phillip Flentje Jan 2012

Illustrative Sections Depicting Landslide Susceptibility Of The Illawarra Escarpment, Andrew Leventhal, Phillip Flentje

Faculty of Engineering - Papers (Archive)

The challenge that land landslides pose to infrastructure and to domestic and commercial development in the Illawarra region haa been recognised in land-use planning for decades. The seminal regional mapping undertaken by Bowman (1974) and, before him the work reported by Shellshear (1890), set the technical benchmarks for others to follow. The challenges presenled to development and road and rail infrastructure were recognised by both Wollongong City Council and major infrastructure providers in the NSW Road and Maritime Services (previously NSW Roads and Traffic Authority) and NSW Rail orp (previouIy State Rail uthority). Continuing support from this group has permitted ...


Performance And Prediction Of Surcharge And Vacuum Consolidation Via Prefabricated Vertical Drains With Special Reference To Highways, Railways And Ports, Buddhima Indraratna, Cholachat Rujikiatkamjorn, Xueyu Geng Jan 2012

Performance And Prediction Of Surcharge And Vacuum Consolidation Via Prefabricated Vertical Drains With Special Reference To Highways, Railways And Ports, Buddhima Indraratna, Cholachat Rujikiatkamjorn, Xueyu Geng

Faculty of Engineering - Papers (Archive)

Much of the world’s essential infrastructure is built along congested coastal belts that are composed of highly compressible and weak soils up to significant depths. Soft alluvial and marine clay deposits have very low bearing capacity and excessive settlement characteristics, with obvious design and maintenance implications on tall structures and large commercial buildings, as well as port and transport infrastructure. Stabilising these soft soils before commencing construction is essential for both long term and short term stability. A system of vertical drains combined with vacuum pressure and surcharge preloading has become an attractive ground improvement alternative in terms of ...


Radial Consolidation Modelling Incorporating Downdrag Effect For A Multi-Layer Soil, Cholachat Rujikiatkamjorn, Buddhima Indraratna Jan 2012

Radial Consolidation Modelling Incorporating Downdrag Effect For A Multi-Layer Soil, Cholachat Rujikiatkamjorn, Buddhima Indraratna

Faculty of Engineering - Papers (Archive)

A system of vertical drains (PVDs) with preloading is a successful method for promoting horizontal drainage and accelerating soil consolidation. A piecewise technique is used to capture the radial consolidation in the multi-layer soil system to incorporate (a) the effect of soil downdrag and (b) smear zone where soil permeability varying linearly. The effect of soil dragged down from the upper soil layer into the lower layer has been analysed in terms of required time for consolidation. It can be seen that the consolidation of the multi layer soil depends on the interaction between 2 adjacent layer, penetration depth, and ...


Inelastic Stability Analysis Of High Strength Rectangular Concrete-Filled Steel Tubular Slender Beam-Columns, Vipulkumar Ishvarbhai Patel, Qing Quan Liang, Muhammad N. S Hadi Jan 2012

Inelastic Stability Analysis Of High Strength Rectangular Concrete-Filled Steel Tubular Slender Beam-Columns, Vipulkumar Ishvarbhai Patel, Qing Quan Liang, Muhammad N. S Hadi

Faculty of Engineering - Papers (Archive)

There is relatively little numerical study on the behavior of eccentrically loaded high strength rectangular concrete-filled steel tubular (CFST) slender beam-columns with large depth-to-thickness ratios, which may undergo local and global buckling. This paper presents a multi scale numerical model for simulating the interaction local and global buckling behavior of hlgh strength thin-walled rectangular CFST slender beam-columns under eccentric loading. The effects of progressive local buckling are taken into account in the mesoscale model based on fiber element formulations. Computational algorithms based on the Muller's method are developed to obtain complete load-deflection responses of CFST slender beam-columns at the ...


Compaction And Strength Testing Of Industrial Waste Blends As Potential Port Reclamation Fill, Cholachat Rujikiatkamjorn, Buddhima Indraratna, Gabriele Chiaro, S Naeeni, S M. A Tasalloti Jan 2012

Compaction And Strength Testing Of Industrial Waste Blends As Potential Port Reclamation Fill, Cholachat Rujikiatkamjorn, Buddhima Indraratna, Gabriele Chiaro, S Naeeni, S M. A Tasalloti

Faculty of Engineering - Papers (Archive)

This paper reports on preliminary laboratory geotechnical investigations conducted to explore the compaction and unconfined compression strength (qu) behaviour of granular waste mixtures of coal wash (CW) and steel furnace slag (SFS). Compaction was conducted under relatively dry and submerged conditions. Proctor compaction test results show that the higher the SFS content, the greater the maximum dry density of mixtures, while the optimum moisture content (OMC) is rather constant. However, for mixtures compacted at their OMC, qu decreases with increasing SFS content. In contrast, for mixtures compacted under submergence and cured in seawater for up to 28 days, qu increases ...


Geotechnics In The 21st Century, Uncertainties And Other Challenges, With Particular References To Landslide Hazard And Risk Assessment, Robin Chowdhury, Phillip Flentje, Gautam Bhattacharya Jan 2012

Geotechnics In The 21st Century, Uncertainties And Other Challenges, With Particular References To Landslide Hazard And Risk Assessment, Robin Chowdhury, Phillip Flentje, Gautam Bhattacharya

Faculty of Engineering - Papers (Archive)

There are significant challenges for the future development and application of geotechnical engineering. Developments in research, analysis and practice have taken place to advance knowledge and practice. While the scope of the profession and its discipline areas is already vast, significant extension is required in the areas of hazard and risk assessment and management. In particular, the field of natural disaster reduction requires the development of innovative approaches within a multi-disciplinary framework. Very useful and up-to-date information on the occurrence frequency and impact of different natural disasters is being assessed and analyzed by a number of organizations around the world ...


Characterising Compacted Soil Using Shear Wave Velocity And Matric Suction, Ana Heitor, Buddhima Indraratna, Cholachat Rujikiatkamjorn Jan 2012

Characterising Compacted Soil Using Shear Wave Velocity And Matric Suction, Ana Heitor, Buddhima Indraratna, Cholachat Rujikiatkamjorn

Faculty of Engineering - Papers (Archive)

The manner in which soil compacts governs the practical and reliable criteria in controlling compaction in the field. A nuclear density meter, based on radioactive isotopes, is the method most commonly used for field compaction, and while it performs well for controlling placement, its localised natnre is not suitable for deeper fills or for assessing larger surface areas. In those types of conditions, alternative non-destrnctive methods should be considered. Numerous resea,:ch studies have focused on the characteristics of compacted soil at its optimum moisture content under saturated conditions, but only a few have evaluated compacted soil under unsaturated conditions ...


Behaviour Of Cfrp Wrapped Square Rc Columns Under Eccentric Loading, X Lei, Thong M. Pham, Muhammad N. S Hadi Jan 2012

Behaviour Of Cfrp Wrapped Square Rc Columns Under Eccentric Loading, X Lei, Thong M. Pham, Muhammad N. S Hadi

Faculty of Engineering - Papers (Archive)

Fibre Reinforced Polymer (FRP) is an excellent material to strengthen existing structures. However, the confinement efficiency of FRP-confined square columns is relatively low compared to circular columns due to stress concentration at the sharp corners. This paper presents a new technique aimed to maximise the efficiency of FRP confinement for square concrete columns: circularisation using segmental circular concrete covers. Sixteen square reinforced concrete columns were cast. Four were used as a reference group; four were rounded 20 mm at each corner and wrapped with three layers of CFRP simulating the conventional methods; the rest eight columns were bonded with four ...