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Articles 211 - 240 of 701
Full-Text Articles in Civil Engineering
A Review Of Probabilistic Methods Of Assessment Of Load Effects In Bridges, Eugene J. Obrien, F Schmidt, Donya Hajializadeh, X-Y Zhou, Bernard Enright, Colin C. Caprani, Simon Wilson, Emma Sheils
A Review Of Probabilistic Methods Of Assessment Of Load Effects In Bridges, Eugene J. Obrien, F Schmidt, Donya Hajializadeh, X-Y Zhou, Bernard Enright, Colin C. Caprani, Simon Wilson, Emma Sheils
Articles
This paper reviews a range of statistical approaches to illustrate the influence of data quality and quantity on the probabilistic modelling of traffic load effects. It also aims to demonstrate the importance of long-run simulations in calculating characteristic traffic load effects. The popular methods of Peaks Over Threshold and Generalized Extreme Value are considered but also other methods including the Box-Cox approach, fitting to a Normal distribution and the Rice formula. For these five methods, curves are fitted to the tails of the daily maximum data. Bayesian Updating and Predictive Likelihood are also assessed, which require the entire data for …
Lighting Design In Europe: Aligning The Demands For Lower Energy Usage With Better Quality., Kevin Kelly, James Duff
Lighting Design In Europe: Aligning The Demands For Lower Energy Usage With Better Quality., Kevin Kelly, James Duff
Articles
Lighting design is one of the fastest changing areas in building engineering. It has evolved significantly in recent years due to changing technology and demands for improved quality, better control, reduced energy and sustainability. This paper is an overview of what is happening in Europe and elsewhere and examines the literature to find that latest recommendations in the Code for Lighting issued by the SLL (Society of Light and Lighting) in the UK change previous demands for equal illuminance across a working plane to more specific and demanding criteria. There are recommendations for qualitative metrics and better distribution of light …
Effects Of Posttensioning Slippage On 2-Way Spanning Concrete Slabs, Niall Holmes, Eoin Byrne
Effects Of Posttensioning Slippage On 2-Way Spanning Concrete Slabs, Niall Holmes, Eoin Byrne
Articles
This paper investigates the effect of improper posttensioning of a 2-way spanning concrete slab subject to a central point load. Due to plate slippage alone, the support conditions only offered a 1-way spanning action which could have led to premature failure with dangerous consequences. Posttensioning can strengthen a flat slab against punching shear by controlling deflections and cracking under service loads compared with traditional punching shear reinforcing methods leading to more slender structures and economic solutions for longer spans. However, if the method is not properly applied, these thinner floor plates can fail in a brittle and sudden manner by …
Nonlinear Analysis Of Isotropic Slab Bridges Under Extreme Traffic Loading, Donya Hajializadeh, A. Salam Al-Sabah, Eugene J. Obrien, Debra F. Laefer, Bernard Enright
Nonlinear Analysis Of Isotropic Slab Bridges Under Extreme Traffic Loading, Donya Hajializadeh, A. Salam Al-Sabah, Eugene J. Obrien, Debra F. Laefer, Bernard Enright
Articles
Probabilistic analysis of traffic loading on a bridge traditionally involves an extrapolation from measured or simulated load effects to a characteristic maximum value. In recent years, Long Run Simulation, whereby thousands of years of traffic are simulated, has allowed researchers to gain new insights into the nature of the traffic scenarios that govern at the limit state. For example, mobile cranes and low-loaders, sometimes accompanied by a common articulated truck, have been shown to govern in most cases. In this paper, the extreme loading scenarios identified in the Long Run Simulation are applied to a non-linear, two-dimensional (2D) plate finite …
Geographic Information System-Based Tools In Environmental Management, Zeinab Bedri, Michael Bruen
Geographic Information System-Based Tools In Environmental Management, Zeinab Bedri, Michael Bruen
Articles
The authors reviewed existing modelling platforms as part of a large study of water and pollution pathways through catchments in Ireland (Irish EPA Pathways project). Worldwide, work on producing catchment management tools (CMTs) has been underway for some time and some of the tools identified here date from as early as 1989. Some of the management problems and model conceptualisations have not changed very much but now there is a stronger emphasis on water quality and more concern about a wider range of contaminants. What has changed substantially is the use of Geographical Information System and Graphical Windows interfaces as …
Water At The Centre Of Environmental Issues – Research At The Ucd Dooge Centre For Water Resources Research, Zeinab Bedri, Eva M. Mockler, Michael Bruen, Yaqian Zhao, Pj Purcell, John O'Sullivan, M. Alsaji, Aisling Corkery, Liam Doherty, M. Dzakpasu, M. Martins, A. Rymszewicz, L. Willuwet
Water At The Centre Of Environmental Issues – Research At The Ucd Dooge Centre For Water Resources Research, Zeinab Bedri, Eva M. Mockler, Michael Bruen, Yaqian Zhao, Pj Purcell, John O'Sullivan, M. Alsaji, Aisling Corkery, Liam Doherty, M. Dzakpasu, M. Martins, A. Rymszewicz, L. Willuwet
Conference papers
Since 1988, the UCD Dooge Centre for Water Resources Research has been conducting research in a wide range of water topics including hydraulics, hydrology, coastal dynamics and wastewater with an emphasis on multi-disciplinary collaboration. This paper presents an overview of this research, both past and present, and provides an outlook to the future research directions of the Centre.
Hydro-Environmental Modeling Of Sewage And Riverine Discharges Into A Coastal Area: Comparison Of Depth-Averaged And Three-Dimensional Models, Zeinab Bedri, John O'Sullivan, Aisling Corkery, Louise Deering, Katalin Demeter, Wim Meijer, Gregory O'Hare, Bartholomew Masterson
Hydro-Environmental Modeling Of Sewage And Riverine Discharges Into A Coastal Area: Comparison Of Depth-Averaged And Three-Dimensional Models, Zeinab Bedri, John O'Sullivan, Aisling Corkery, Louise Deering, Katalin Demeter, Wim Meijer, Gregory O'Hare, Bartholomew Masterson
Conference papers
This study applies and compares two hydrodynamic and water quality models; a depth-averaged (TELEMAC-2D) and a three-dimensional model (TELEMAC-3D) on their performance in simulating the transport and fate of Escherichia coli (a main microbial bathing water quality indicator) in the coastal waters of Bray, Ireland subjected to sewage discharges and freshwater inflows from the River Dargle. The models first calibrated and validated against hydrodynamic and water quality data, were used to simulate Escherichia coli distribution patterns based on mean spring and mean neap tides for dry and wet weather scenarios. The hydrodynamic calibration yielded a good match between both models …
Enhancing Building Performance And Environmental Learning: A Case Study Of Virginia Beach City Public Schools, Shannon Chance, John Timothy Cole
Enhancing Building Performance And Environmental Learning: A Case Study Of Virginia Beach City Public Schools, Shannon Chance, John Timothy Cole
Books/Book Chapters
School buildings directly affect their natural and socio-cultural environments. They do this through their construction, maintenance, operation, and demolition. Most of the school buildings we have in stock today drain natural resources and inadvertently perpetuate a culture of environmental, social, and long-term economic ignorance and misuse. When approached thoughtfully, however, the design of school buildings can help inform and enrich society. Well-designed buildings can impart environmental knowledge and values. They can foster more effective behaviors among the people who learn in and from them. Effectively designed buildings can also conserve natural resources and—at their best—even help replenish the natural environment. …
Active Confinement Of Weakened Concrete Columns, Niall Holmes, Dervilla Niall, C. O’Shea
Active Confinement Of Weakened Concrete Columns, Niall Holmes, Dervilla Niall, C. O’Shea
Articles
This paper investigates the advantages of using of external active confinement to improve the compression load capacity of concrete cylinders using mild steel band clamps. For this, passive and actively pre-stressed steel bands have been attached to concrete cylinders to mimic real structural columns which may otherwise have to be removed and replaced due to poor strength performance. The experimental programme included compression load testing a number of unreinforced concrete cylindrical specimens to establish the effect the confinement had on the compressive load-carrying capacity and the stress-strain behaviour. A number of parameters were investigated in the study including the effect …
Experimental Design Of Photo-Fenton Reactions For The Treatment Of Car Wash Wastewater Effluents By Response Surface Methodological Analysis, Maha Tony, Zeinab Bedri
Experimental Design Of Photo-Fenton Reactions For The Treatment Of Car Wash Wastewater Effluents By Response Surface Methodological Analysis, Maha Tony, Zeinab Bedri
Articles
Establishing a treatment process for practical and economic disposal of car wash wastewater has become an urgent environmental concern. Photo-Fenton’s process as one of the advanced oxidation processes is a potentially useful oxidation process in treating such wastewater. Lab-scale experiments with UV source, coupled with Fenton’s reagent, showed that hydrocarbon oil is degradable through such a process. The feasibility of photo-Fenton’s process to treat wastewater from a car wash is investigated in the present study. A factorial design based on the response surface methodology was applied to optimize the photo-Fenton oxidation process conditions using chemical oxygen demand (COD) reduction as …
Equity And Fairness In Transport Planning: The State Of Play, Sarah Rock, Aoife Ahern Prof., Brian Caulfield Dr.
Equity And Fairness In Transport Planning: The State Of Play, Sarah Rock, Aoife Ahern Prof., Brian Caulfield Dr.
Conference Papers
This paper explores the concept of equity, or fairness, in transport. As a pillar of sustainable development, social equity is an important objective of transport planning. The provision of transport infrastructure can have significant equity impacts on society through the distribution of costs and benefits. In recent years, there has been an increase in research interest in transportation related equity issues. The paper outlines the primary theoretical traditions that relate to equity and transport equity, and how equity concerns are currently addressed and evaluated in academia and in practice. Recent research has attempted to establish stronger principles from which to …
Longitudinal Shear Resistance Of Composite Slabs Containing Crumb Rubber In Concrete Toppings, Niall Holmes, Kevin Dunne, John O'Donnell
Longitudinal Shear Resistance Of Composite Slabs Containing Crumb Rubber In Concrete Toppings, Niall Holmes, Kevin Dunne, John O'Donnell
Articles
This paper investigates the behaviour and longitudinal shear capacity of metal deck composite slabs with the inclusion of crumb rubber in the concrete toppings. The ability of the slabs to act compositely is governed by the shear interaction between the concrete topping and the profiled steel deck. Results here show that crumb rubber concrete (CRC) improve the overall shear bond capacity between the steel deck and topping following an experimental study on full scale loading tests in accordance with Eurocode 4. The results confirm that composite slabs incorporating crumb rubber had no effect on the longitudinal shear resistance with similar …
A Review Of The Hl-93 Bridge Traffic Load Model Using An Extensive Wim Database, Cathal Leahy, Eugene J. Obrien, Bernard Enright, Donya Hajializadeh
A Review Of The Hl-93 Bridge Traffic Load Model Using An Extensive Wim Database, Cathal Leahy, Eugene J. Obrien, Bernard Enright, Donya Hajializadeh
Articles
HL-93, the current bridge traffic load model used in the United States, is examined here. Weigh-in-motion from 17 sites in 16 states, and containing 74 million truck records, is used to assess the level of consistency in the characteristic load effects implied by the HL-93 model. The load effects of bending moment and shear force are considered on single-lane and two-lane same-direction slab and girder bridges with a range of spans. It is found that the ratio of WIM-implied to HL-93 load effect varies considerably from one load effect to another. An alternative model is proposed which achieves improvements in …
Acoustic Properties Of Concrete Panels With Crumb Rubber As A Fine Aggregate Replacement, Niall Holmes, Alex Browne, Christopher Montague
Acoustic Properties Of Concrete Panels With Crumb Rubber As A Fine Aggregate Replacement, Niall Holmes, Alex Browne, Christopher Montague
Articles
This paper presents the acoustic performance of small scale crumb rubber concrete (CRC) panels in terms of the sound absorbance and insulation at low (63, 125, 250 & 500 Hz) and high (1000, 2000, 4000 and 5000 Hz) frequencies. Acoustic tests were conducted with differing levels of fine aggregate replacement with crumb rubber (7.5 and 15%) with four different grades following freezing and heating. Analysis of the workability, compressive strength and density are also presented. The results found that CRC performed well in terms of sound absorbance particularly with higher proportions (15% here) and grades of crumb rubber. As an …
Public / Private Bim: An Irish Perspective, Barry Mcauley, Alan V. Hore, John Deeney
Public / Private Bim: An Irish Perspective, Barry Mcauley, Alan V. Hore, John Deeney
Conference papers
The current economic difficulties have affected most practitioners within the industry and, as a result, many firms and contractors are bidding for fewer projects, resulting in below-cost tenders. It is clear that, many firms and contractors are now operating on thin margins; which makes it increasingly difficult for them to commit to the introduction of new software applications and system upgrades. The transition to Building Information Modelling (BIM) from traditional 2D CAD by Irish firms and contractors has been a relatively slow process compared with our international colleagues. There are many reasons for this, including lack of resources, lack of …
Establishing Key Performance Indicators To Measure The Benefit Of Introducing The Facilities Manager At An Early Stage In The Building Information Modelling Process, Barry Mcauley, Alan V. Hore, Roger West
Establishing Key Performance Indicators To Measure The Benefit Of Introducing The Facilities Manager At An Early Stage In The Building Information Modelling Process, Barry Mcauley, Alan V. Hore, Roger West
Conference papers
The Facilities Manager occupies a unique position within the lifecycle of a building asset, as he/she is one of the only Architectural, Engineering, and Construction/Facilities Management (AEC / FM) professionals who is in a position to view the product of the entire design and build process. Despite the potential benefits that the Facilities Manager offers, this profession still remains largely undeveloped and still does not command the recognition it deserves within the AEC/FM sector. This is beginning to change through the introduction of Building Information Modelling (BIM) which can offer a new level of functionality for the management of buildings …
Environmental Consequences Of A Power Plant Shut-Down: A Three-Dimensional Water Quality Model Of Dublin Bay, Zeinab Bedri, Michael Bruen, Aodh Dowley, Barthelomew Masterson
Environmental Consequences Of A Power Plant Shut-Down: A Three-Dimensional Water Quality Model Of Dublin Bay, Zeinab Bedri, Michael Bruen, Aodh Dowley, Barthelomew Masterson
Articles
A hydro-environmental model is used to investigate the effect of cessation of thermal discharges from a power plant on the bathing water quality of Dublin Bay. Before closing down, cooling water from the plant was mixed with sewage effluent prior to its discharge, creating a warmer, less-saline buoyant pollutant plume that adversely affects the water quality of Dublin Bay. The model, calibrated to data from the period prior to the power-plant shut-down (Scenario 1), assessed the water quality following its shut-down under two scenarios; (i) Scenario 2: continued abstraction of water to dilute sewage effluents before discharge, and (ii) Scenario …
Bathing Water Quality Prediction Using An Integrated Catchment And 3-D Coastal Hydrodynamic Model, John O'Sullivan, Zeinab Bedri, Aisling Corkery, Louise Deering, Katalin Demeter, Wim Meijer, Barthelomew Masterson, Gregory O'Hare
Bathing Water Quality Prediction Using An Integrated Catchment And 3-D Coastal Hydrodynamic Model, John O'Sullivan, Zeinab Bedri, Aisling Corkery, Louise Deering, Katalin Demeter, Wim Meijer, Barthelomew Masterson, Gregory O'Hare
Conference papers
Under the new European Union Bathing Water Directive (2006/7/EC) which comes into force in 2014, more stringent bathing water quality standards, defined in terms of Escherichia coli (E.coli) and Intestinal Enterococci (I.E.), will apply in Irish bathing waters. Compliance with these standards is ensured through a structured water quality monitoring programme that is published by Authorities with responsibility for bathing water areas in advance of each bathing season. The directive recognises that elevated levels of faecal coliform bacteria in bathing areas can derive from the overland transport of waste from livestock in the rural fraction of river catchments. On days …
The Effect Of Truck Permitting Policy On Us Bridge Loading, Eugene J. Obrien, Bernard Enright, Cathal Leahy
The Effect Of Truck Permitting Policy On Us Bridge Loading, Eugene J. Obrien, Bernard Enright, Cathal Leahy
Conference papers
No abstract provided.
Reliability-Based Bridge Assessment Using Enhanced Monte Carlo To Simulate Extreme Traffic Loading, Bernard Enright, Donya Hajializadeh, Eugene J. Obrien
Reliability-Based Bridge Assessment Using Enhanced Monte Carlo To Simulate Extreme Traffic Loading, Bernard Enright, Donya Hajializadeh, Eugene J. Obrien
Conference papers
A framework is presented for the assessment of the safety of a bridge deck under actual traffic loading using an enhanced Monte Carlo method which attempts to reduce computational cost while preserving the advantages of more conventional, computationally intensive, simulation. To generate the bridge loading scenarios, an extensive Weigh-in-Motion (WIM) database is used to calibrate a sophisticated simulation model of two-directional traffic. Traffic and vehicle characteristics are generated from statistical distributions derived from measured traffic data. Two examples are used in this study to assess the usefulness and accuracy of the enhanced method. In the first, a simple example is …