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Articles 121 - 143 of 143
Full-Text Articles in Engineering
Behaviour Of Eccentric Loading Of Frp Confined Fibre Steel Reinforced Concrete Columns, Muhammad N. S Hadi
Behaviour Of Eccentric Loading Of Frp Confined Fibre Steel Reinforced Concrete Columns, Muhammad N. S Hadi
Faculty of Engineering - Papers (Archive)
This paper presents results of testing 16 specimens, 12 of which as columns under different eccentricitiesand four as beams under four point loading regime. All 16 specimens were circular in cross section andwere made of reinforced concrete. Four specimens served as reference specimens and were just made ofreinforced concrete. The next four specimens were wrapped with carbon fibre reinforced polymers(CFRP). The next four specimens had steel fibres added to the concrete. The final four specimens werereinforced with steel fibres and wrapped with CFRP. From each group of specimens, one specimen wastested as a column under a concentric load, the second …
Survey Response As Organisational Behaviour: An Analysis Of The Annual Enterprise Survey, 2003-2007, Walter R. Davis, Nathaniel Pihama
Survey Response As Organisational Behaviour: An Analysis Of The Annual Enterprise Survey, 2003-2007, Walter R. Davis, Nathaniel Pihama
Faculty of Engineering and Information Sciences - Papers: Part A
Non-response is a matter of great concern to national statistical offices and a key issue for any survey because it can introduce bias to survey estimation. However, in this presentation, we focus on a business's decision to participate in a survey as an example of organisational behaviour and draw on basic organisational theory to explain why businesses may not respond to surveys (eg Tomaskovic-Devey et al 1994). The data are drawn from the Statistics New Zealand Respondent Management System, which links the response history of individual businesses in all Statistics NZ surveys with information from the Statistics NZ Business Frame. …
Behaviour Of Fibre Reinforced Concrete Slabs, Muhammad N. S Hadi
Behaviour Of Fibre Reinforced Concrete Slabs, Muhammad N. S Hadi
Faculty of Engineering - Papers (Archive)
This paper presents a comparison of the properties of concrete slabs when two types of fibres are added. One specimen had no fibres and acted as a control specimen. The remaining four specimens had steel and polypropylene fibres added in the volumetric ratio of 0.5% and 1.0%. The dimensions of the slab specimens were 82082080 mm and were supported by four rollers at their edges. A displacement controlled point load was applied at the centre of the slabs. The ductilities of the tested slabs were calculated and compared so as their load carrying capacities. Results of the experimental programme were …
The Effect Of Helical Pitch On The Behaviour Of Helically Confined Hsc Beams, Muhammad N. S Hadi, Nuri Elbasha
The Effect Of Helical Pitch On The Behaviour Of Helically Confined Hsc Beams, Muhammad N. S Hadi, Nuri Elbasha
Faculty of Engineering - Papers (Archive)
The strength and ductility of HSC beams are enhanced through the application of helical reinforcement located in the compressionregion of the beams. The pitch of helix is an important parameter controlling the level of strength and ductility enhancement of overreinforcedhigh strength concrete beams. This paper presents an experimental investigation of the effect of helix pitch on the beam behaviourthrough testing five helically confined full-scale beams. The helix pitches were 25, 50, 75, 100 and 160 mm. Beams cross section was200 · 300 mm, and with a length of 4 m and a clear span 3.6 m subjected to four point …
Assessment Of Drucker-Prager Type Plasticity Models For Predicting The Behaviour Of Frp-Confined Concrete, T Yu, J G. Teng, Y L. Wong, S L. Dong
Assessment Of Drucker-Prager Type Plasticity Models For Predicting The Behaviour Of Frp-Confined Concrete, T Yu, J G. Teng, Y L. Wong, S L. Dong
Faculty of Engineering and Information Sciences - Papers: Part A
This paper presents a critical assessment of the ability of existing Drucker-Prager (D-P) type plasticity models to predict the behaviour of confined concrete using both experimental observations and a recent analytical model. This assessment shows that for a D-P plasticity model to succeed in predicting the behaviour of FRP-confined and other passively-confined concrete, it needs to possess the following three features: (a) a yield criterion which includes the third deviatoric stress invariant, (b) a hardening/softening rule which is dependent on the confining pressure; and (c) a flow rule which is dependent on both the confining pressure and the rate of …
Enhanced Numerical Analysis Of Ground Behaviour Influenced By Tree Root Suction, Behzad Fatahi, Buddhima Indraratna, Hadi Khabbaz
Enhanced Numerical Analysis Of Ground Behaviour Influenced By Tree Root Suction, Behzad Fatahi, Buddhima Indraratna, Hadi Khabbaz
Faculty of Engineering - Papers (Archive)
Tree roots provide three stabilising functions: (a) reinforcement of the soil, (b) dissipation of excess pore pressures, (c) establishing sufficient matric suction to increase the shear strength. This paper looks at the way that vegetation influences soil moisture content distribution, and ground settlement. A theoretical model previously developed by the authors for the rate of tree root water uptake together with an associated numerical simulation is used in this study. Field measurements taken from literature published previously are compared with the authors' numerical model. The predicted results obtained from the numerical analysis, compared favourably with the field measurements, justifying the …
Behaviour Of Frp Strengthened Concrete Columns Under Eccentric Compression Loading, Muhammad N. S Hadi
Behaviour Of Frp Strengthened Concrete Columns Under Eccentric Compression Loading, Muhammad N. S Hadi
Faculty of Engineering - Papers (Archive)
This paper presents results of testing eccentrically loaded columns externally wrapped with two types of materials. Six cylindrical (205 mm diameter and 925 mm height) plain columns were cast and tested. Half of the columns were wrapped with GFRP and the other half with CFRP. All columns were tested by applying an axial load at 50 mm eccentricity. In each group (GFRP or CFRP wrapped) of columns, one column did not have any vertical straps, one had vertical straps made of one layer of wrapping material and one column had vertical straps made of three layers of wrapping material. All …
The Behaviour Of Frp Wrapped Hsc Columns Under Different Eccentric Loads, Muhammad N. S Hadi
The Behaviour Of Frp Wrapped Hsc Columns Under Different Eccentric Loads, Muhammad N. S Hadi
Faculty of Engineering - Papers (Archive)
The majority of columns are subjected to a combination of an axial load and a bending moment in one or two directions. With a few exceptions, most of the research in the area of FRP wrapped columns have concentrated on the behaviour of concentrically loaded columns. This paper presents results of testing nine reinforced high strength concrete col-umns. The column specimens are circular in shape with 205 mm diameter and 925 mm height. Concrete compressive strength was 65 MPa. All columns were reinforced with steel. Three columns were not wrapped, three columns were wrapped with three layers of carbon FRP …
Behaviour Of Frp Wrapped Circular Concrete Columns Under Eccentric Loading, Muhammad N. S Hadi
Behaviour Of Frp Wrapped Circular Concrete Columns Under Eccentric Loading, Muhammad N. S Hadi
Faculty of Engineering - Papers (Archive)
The use of steel reinforcement in concrete construction has proven to be very effective due to the excellent properties that the reinforcing steel has that compliment the concrete properties, for example increase in tensile strength and ductility. However, one of the drawbacks of steel is its long-term behaviour especially in areas where the humidity is high. In such areas, the steel usually suffers from rust and oxidation which eventually lead to the deterioration of the concrete structure. One method to reduce this effect is to protect the reinforcing bars, for example wrapping or using cathodic protection. This paper investigates the …
Numerical Simulation Of Pile Group Behaviour In Liquefying Sloping Ground, Deepa S. Liyanapathirana
Numerical Simulation Of Pile Group Behaviour In Liquefying Sloping Ground, Deepa S. Liyanapathirana
Faculty of Engineering - Papers (Archive)
This paper investigates pile group behaviour in liquefying sloping ground. The numerical procedure utilised involves two main steps. First a ground response analysis is carried out using a stress path model to obtain the maximum ground displacements along the pile and the degraded soil modulus over the depth of the soil deposit. Next a dynamic analysis is carried out for a single pile in the group assuming that each pile in the group behaves in the same way during the earthquake loading. The method has been verified using centrifuge data, where soil liquefaction has been observed in laterally spreading sloping …
Embracing Knowledge And Behaviour Management To Improve Performance Of Software Intensive Projects, Ricardo Peculis, Derek Rogers, Peter Campbell
Embracing Knowledge And Behaviour Management To Improve Performance Of Software Intensive Projects, Ricardo Peculis, Derek Rogers, Peter Campbell
SMART Infrastructure Facility - Papers
Many reasons have been offered to explain why software projects fail. Still, software intensive projects often present schedule delays, cost overruns and delivering products with reduced functionality. This paper argues that lack of knowledge is yet another factor that causes projects to under perform, which in turn drives undesirable social behaviour that worsens the situation. Software intensive projects develop solutions highly dependent on software that should satisfy a need. The engineering process to develop such complex solutions comprises of a series of transformations that transform products from one domain into products in another domain, requiring knowledge pertinent to both input …
An Investigation Into The Behaviour Of Sheet Metal Workpieces When Subjected To Simultaneous Double Bending, Arthur Henry
An Investigation Into The Behaviour Of Sheet Metal Workpieces When Subjected To Simultaneous Double Bending, Arthur Henry
Masters
Simultaneous double bending, where two 90° bends are formed in a single workpiece, in close proximity to each other and in alternate directions, are common in the metal forming industry, especially so in small production batches where press brakes and their associated tooling is extensively used. This bending process, resulting in what is commonly called a ‘joggle’ bend, is executed using specially shaped forming dies. The geometry of these dies determines the geometry of the bend and also the amount of sliding and /or stretching that takes place in the workpiece during the forming process. This in turn determines the …
Flexural Behaviour Of Hybrid Frp-Concrete-Steel Double Skin Tubular Members, T Yu, Y L. Wong, J G. Teng, S L. Dong, E S.S Lam
Flexural Behaviour Of Hybrid Frp-Concrete-Steel Double Skin Tubular Members, T Yu, Y L. Wong, J G. Teng, S L. Dong, E S.S Lam
Faculty of Engineering and Information Sciences - Papers: Part A
This paper presents the results of an experimental study on the flexural behavior of a new type of hybrid FRP-concrete-steel member as well as results from a corresponding theoretical model based on the plane section assumption and the fiber element approach. This new type of hybrid member is in the form of a double-skin tube, composed of a steel inner tube and an FRP outer tube with a concrete infill between the two tubes, and may be employed as columns or beams. The parameters examined in this study include the section configuration, the concrete strength, and the thicknesses of the …
Human Behaviour Recognition With Segmented Inertial Data, Chao Sun, David A. Stirling, Fazel Naghdy
Human Behaviour Recognition With Segmented Inertial Data, Chao Sun, David A. Stirling, Fazel Naghdy
Faculty of Engineering - Papers (Archive)
The development and recent advancements of integrated inertial sensors has afforded substantive new possibilities for the acquisition and study of complex human motor skills and ultimately their imitation within robotic systems. This paper describes continuing work on kinetic models that are derived through unsupervised learning from a continuous stream of signals, including Euler angles and accelerations in three spatial dimensions, acquired from motions of a human arm. An intrinsic classification algorithm, MML (Minimum Message Length encoding) is used to segment the complex data, formulating a Gaussian Mixture Model of the dynamic modes it represents. Subsequent representation and analysis as FSM …
Numerical Prediction Of Vadose Zone Behaviour Influenced By Vegetation, Buddhima Indraratna, Behzad Fatahi, Mohammad Hadi Khabbaz
Numerical Prediction Of Vadose Zone Behaviour Influenced By Vegetation, Buddhima Indraratna, Behzad Fatahi, Mohammad Hadi Khabbaz
Faculty of Engineering - Papers (Archive)
Bioengineering aspects of native vegetation are currently, and rapidly, being evolved to improve soil stiffness, slope stabilisation, and erosion control. Apart from the reinforcement effect, tree roots establish sufficient matric suction to increase the shear strength and stiffness of the soil. This paper looks at the way, vegetation influences soil matric suction, shrinkage, and ground settlement. A mathematical model for the rate of root water uptake that considers ground conditions, type of vegetation and climatic parameters, has been developed. Based on this proposed model, the distribution of moisture and the matric suction profile adjacent to the tree are numerically analysed. …
Comparison Of Small-Field Behaviour In Mgb2, Low And High Temperature Superconductors, Alexey V. Pan, S X. Dou
Comparison Of Small-Field Behaviour In Mgb2, Low And High Temperature Superconductors, Alexey V. Pan, S X. Dou
Australian Institute for Innovative Materials - Papers
Different types of superconductors have been investigated at small magnetic fields (Ba) over wide temperature (T) ranges at different Ba orientations. It has been shown that the temperature dependence of the characteristic field (B*), separating the Ba-independent critical current density (Jc) plateau (single vortex pinning regime) and the region with Jc(Ba) (collective pinning), can be attributed either to the temperature dependence of the magnetic penetration depth for Nb-film and MgB2bulk superconductors, or to thermally activated processes for Bi-based superconductors and YBa2Cu3O7−δ superconducting …
Deformation Behaviour Of A New Type Al-Mg-Si-Cu Alloy, Lizi He, A. K. Tieu, Cheng Lu, Yanbo Chen, Hongtao Zhu
Deformation Behaviour Of A New Type Al-Mg-Si-Cu Alloy, Lizi He, A. K. Tieu, Cheng Lu, Yanbo Chen, Hongtao Zhu
Faculty of Engineering - Papers (Archive)
No abstract provided.
Actuation Behaviour Of Polyaniline Films And Tubes Prepared By Phase Inversion Technique, Binbin Xi, Van-Tan Truong, Vahid Mottaghitalab, Philip G. Whitten, Geoffrey M. Spinks, G G. Wallace
Actuation Behaviour Of Polyaniline Films And Tubes Prepared By Phase Inversion Technique, Binbin Xi, Van-Tan Truong, Vahid Mottaghitalab, Philip G. Whitten, Geoffrey M. Spinks, G G. Wallace
Faculty of Engineering - Papers (Archive)
The phase inversion technique was used to produce polyaniline (PAn) actuators with different geometries that cannot be obtained by PAn cast from N -methyl-2-pyrrolidinone (NMP) solution in a conventional way. PAn was cast and coagulated in a water bath forming films and tubes with or without a platinum (Pt) wire helix as an interconnect. PAn was doped with hydrochloric solution (HCl, 1 M) (PAn/HCl) or methanesulfonic acid (MSA, 1 M) (PAn/MSA). In nitric acid (HNO3, 1 M) aqueous electrolyte, the actuation strain of PAn/HCl was 0.9% which increased to 2.0% and 2.7% for the tubes without and with …
Modeling Of Bolted Joint Behaviour Under Constant Normal Stiffness Conditions - Laboratory Study, Buddhima Indraratna, Najdat I. Aziz, A Dey
Modeling Of Bolted Joint Behaviour Under Constant Normal Stiffness Conditions - Laboratory Study, Buddhima Indraratna, Najdat I. Aziz, A Dey
Faculty of Engineering - Papers (Archive)
The shear behaviour of grouted joints has been studied in the recent past using the conventional direct shear apparatus, where the normal load on the joint plane is kept constant during testing. The Constant Normal Stiffness (CNS) condition is adopted in this study of shear behaviour of bolted joints, as the CNS condition represents a better approximation of the deformation behaviour of grouted joints in underground excavations as compared to the conventional Constant Normal Load (CNL) condition. A series of tests were conducted to study the behaviour of these stabilised joints under constant normal stiffness condition at an initial normal …
Predicted And Observed Behaviour Of Soft Clay Foundations Stabilised With Vertical Drains, Buddhima Indraratna, Wadud Salim, I W Redana
Predicted And Observed Behaviour Of Soft Clay Foundations Stabilised With Vertical Drains, Buddhima Indraratna, Wadud Salim, I W Redana
Faculty of Engineering - Papers (Archive)
A novel plane strain approach is introduced to model the behaviour of embankment foundations on soft clay stabilised with vertical drains, where the classical axisymmetric solutions are converted to an equivalent plane strain model, incorporating the effects of smear and well resistance. This paper describes the behaviour of an embankment stabilised with vertical drains, where a specific case history is selected from Malaysia. The consolidation of soft clay is modelled on the basis of the modified Cam-clay. The settlement behaviour at various stages of embankment loading is analysed using the finite element technique, and the numerical results are compared with …
Experimental And Numerical Modeling Of Shear Behaviour Of Rock Joints, Buddhima Indraratna, A Haque
Experimental And Numerical Modeling Of Shear Behaviour Of Rock Joints, Buddhima Indraratna, A Haque
Faculty of Engineering - Papers (Archive)
The shear behaviour of soft rock joints is investigated in laboratory under both Constant Normal Load (CNL) and Constant Normal Stiffness (CNS) conditions. The laboratory behaviour is modelled numerically using the Universal Distinct Element Code (UDEC). The predicted shear stress, normal stress and dilation behaviour with shear displacements are compared with the laboratory results. It is observed that UDEC can predict the peak shear stress of unfilled joints under CNS, however, it overestimates the joint dilation as well as the normal stress. The maximum peak shear stress in UDEC is attained at a greater shear displacement in contrast to the …
Superplastic Behaviour And Cavitation Formation Of A1-2li-1.9cu-1.5mg-0.09zr Alloy, Ali Mohamed Farah
Superplastic Behaviour And Cavitation Formation Of A1-2li-1.9cu-1.5mg-0.09zr Alloy, Ali Mohamed Farah
Archived Theses and Dissertations
No abstract provided.
A Study On The Behaviour Of Sandwich Beams Under Three Point Bending, Sherif Sami
A Study On The Behaviour Of Sandwich Beams Under Three Point Bending, Sherif Sami
Archived Theses and Dissertations
No abstract provided.