Prediction of Time-dependent Deformations in Post-tensioned Concrete Suspended Slabs in Tall Buildings. The proposed project aims to develop an analytical model that can predict the time-dependent deformations in post-tensioned concrete slabs considering concrete shrinkage and creep, cracking, and bond-slip behaviour. Over the past several years, numerous cases have been reported in Australia and elsewhere, of flexural elements for which the calculated deflection is far less than the actual defl ....Prediction of Time-dependent Deformations in Post-tensioned Concrete Suspended Slabs in Tall Buildings. The proposed project aims to develop an analytical model that can predict the time-dependent deformations in post-tensioned concrete slabs considering concrete shrinkage and creep, cracking, and bond-slip behaviour. Over the past several years, numerous cases have been reported in Australia and elsewhere, of flexural elements for which the calculated deflection is far less than the actual deflection leading to serviceability problems. The significance of this investigation hence lies in its potential to provide a solution to more accurately predict service-life deflections in post-tensioned concrete suspended slabs and validate the model with real-life deflections monitored over time on a current building project.Read moreRead less
Composite Beams using Fibre Reinforced Concrete (FRC) Profiled Slabs. The Australian construction industry is currently introducing long-span trapezoidal profiled steel sheeting for the composite floor slabs in composite steel-concrete framed buildings, in order improve efficiency and economy. When the ribs in the sheeting are orthogonal to the steel beam (the secondary beam), the integrity of the shear connection between the steel beam and the composite slab is compromised by premature failur ....Composite Beams using Fibre Reinforced Concrete (FRC) Profiled Slabs. The Australian construction industry is currently introducing long-span trapezoidal profiled steel sheeting for the composite floor slabs in composite steel-concrete framed buildings, in order improve efficiency and economy. When the ribs in the sheeting are orthogonal to the steel beam (the secondary beam), the integrity of the shear connection between the steel beam and the composite slab is compromised by premature failures. This project aims to research the innovative use of steel fibre reinforced concrete in these slabs, which has been shown (at UNSW and elsewhere) in other applications to possess superior strength properties when subjected to a variety of loading regimes.Read moreRead less
A Re-evaluation of the Safety and Reliability Indices for Reinforced Concrete Structures. The use of concrete in Australian building structures exceeds 13 million tonnes per year and its impact on the environment is considerable. With 5% of total CO2 emissions coming from cement production, one of the main components of concrete, it is imperative that Australian standards produce efficient design solutions. Preliminary modelling shows that a minimum 5% efficiency gain is possible through a re-ev ....A Re-evaluation of the Safety and Reliability Indices for Reinforced Concrete Structures. The use of concrete in Australian building structures exceeds 13 million tonnes per year and its impact on the environment is considerable. With 5% of total CO2 emissions coming from cement production, one of the main components of concrete, it is imperative that Australian standards produce efficient design solutions. Preliminary modelling shows that a minimum 5% efficiency gain is possible through a re-evaluation of reliability indices with contemporary construction practices and materials, giving an immediate 180,000 tonne per annum reduction in carbon emissions. Added to this are savings through reduced transport and reduced water, sand and aggregate consumption, the potential saving on the environment, and economy, are considerable.Read moreRead less
Time-dependent in-service behaviour of composite concrete slabs with profiled steel decking. At present, the in-service behaviour of composite floor slabs is incompletely understood, and structural designers have no reliable means to assess the effects on structural behaviour of shrinkage warping, time-dependent cracking, temperature gradients and the influence of prestress on bond-slip at the concrete-deck interface. This project will, through laboratory testing and theoretical analysis, provid ....Time-dependent in-service behaviour of composite concrete slabs with profiled steel decking. At present, the in-service behaviour of composite floor slabs is incompletely understood, and structural designers have no reliable means to assess the effects on structural behaviour of shrinkage warping, time-dependent cracking, temperature gradients and the influence of prestress on bond-slip at the concrete-deck interface. This project will, through laboratory testing and theoretical analysis, provide the necessary data to develop and calibrate models to simulate structural behaviour and provide rational guidance for design engineers. The project will result in more serviceable and more economical composite floor slabs in Australian buildings, thereby reducing the costs of construction, maintenance and repair.Read moreRead less
Bridge Health Monitoring using an Intelligent System based on Bragg Grating Fibre Optic Sensors. Use of Fibre Optic Sensors for monitoring bridges is an imerging technology. Recent advances in Bragg grating fibre optic sensors make it possible to monitor structural behaviour of over a period of long time. This technology is further being developed by the University of New South Wales. In conjunction with Roads and Traffic Authorities, these sensors will be further developed and used in major bri ....Bridge Health Monitoring using an Intelligent System based on Bragg Grating Fibre Optic Sensors. Use of Fibre Optic Sensors for monitoring bridges is an imerging technology. Recent advances in Bragg grating fibre optic sensors make it possible to monitor structural behaviour of over a period of long time. This technology is further being developed by the University of New South Wales. In conjunction with Roads and Traffic Authorities, these sensors will be further developed and used in major bridges for both remote and contact monitoring techniques. In this project an Intelligent Bridge Monitoring Remote System will be developed an implemented.Read moreRead less
Foundation remediation using resin injection. The aim of this research project is to explore the application of injected expanded polyurethane resins as a new option for the re-levelling and stabilisation of deflected foundations on reactive clay soils. It will identify the physical and behavioural characteristics of resin-injected reactive clay foundations, in the context of both shallow and deep injection, and will identify any limitations to the applicability of the approach. Based on detaile ....Foundation remediation using resin injection. The aim of this research project is to explore the application of injected expanded polyurethane resins as a new option for the re-levelling and stabilisation of deflected foundations on reactive clay soils. It will identify the physical and behavioural characteristics of resin-injected reactive clay foundations, in the context of both shallow and deep injection, and will identify any limitations to the applicability of the approach. Based on detailed laboratory and field testing, and advanced numerical modelling, the outcome will be the ability to confidently assess various foundation remediation strategies in reactive clay soils, and provide much needed design guidance to the geotechnical profession and building industry.Read moreRead less
Strength of two-way steel fibre reinforced composite flooring systems. The construction industry in Australia is introducing efficient and economical long-span profiled steel sheeting for composite flooring systems, and Steel Fibre Reinforced Concrete (SFRC) applications are becoming widespread. Australia is a recognised world leader in the research of both composite structures and SFRC. Using SFRC in composite decks to eliminate conventional reinforcement is very efficient and cost-effective, b ....Strength of two-way steel fibre reinforced composite flooring systems. The construction industry in Australia is introducing efficient and economical long-span profiled steel sheeting for composite flooring systems, and Steel Fibre Reinforced Concrete (SFRC) applications are becoming widespread. Australia is a recognised world leader in the research of both composite structures and SFRC. Using SFRC in composite decks to eliminate conventional reinforcement is very efficient and cost-effective, but surprisingly little relevant research aimed at the Australian industry has been reported. Comprehensive design guidance is much needed to advance this technology. This project will give designers confidence and expertise to advance these technologies, while maintaining Australian research and practice in composite structures at the forefront.Read moreRead less
Time-Dependent Response and Deformations of Composite Beams with Innovative Deep Trapezoidal Decks. The construction industry in Australia is introducing efficient and economical long-span trapezoidal profiled steel sheeting for composite flooring systems. Australia is a world leader in the research of composite structures. Composite beams undergo deformations because the concrete creeps and shrinks, and because the slab slips relative to the steel joist. Surprisingly little research has address ....Time-Dependent Response and Deformations of Composite Beams with Innovative Deep Trapezoidal Decks. The construction industry in Australia is introducing efficient and economical long-span trapezoidal profiled steel sheeting for composite flooring systems. Australia is a world leader in the research of composite structures. Composite beams undergo deformations because the concrete creeps and shrinks, and because the slab slips relative to the steel joist. Surprisingly little research has addressed these issues collectively; they are of paramount significance with trapezoidal decks and research is much-needed. This research will investigate the interaction of creep, shrinkage and partial interaction in these composite beams, producing valuable design guidance to keep Australian research and practice at the forefront internationally.Read moreRead less
Improvement of the performance of water-sensitive geomaterials using hydrophobic additives. Geo-structures such as road and railway bases suffer from water induced damage because they readily interact with the atmosphere and shallow water tables. Under traffic loading, damage to geo-structures occurs as cracking, rutting and roughness, when the strength and stiffness of the geomaterials are compromised by on-going moisture variations. Substantial cost savings to the community can be made if ef ....Improvement of the performance of water-sensitive geomaterials using hydrophobic additives. Geo-structures such as road and railway bases suffer from water induced damage because they readily interact with the atmosphere and shallow water tables. Under traffic loading, damage to geo-structures occurs as cracking, rutting and roughness, when the strength and stiffness of the geomaterials are compromised by on-going moisture variations. Substantial cost savings to the community can be made if effective methods can be found to minimise such damage. This project proposes to study a novel technique, in which blends of hydrophobic polymer additives are used to increase the stability of geomaterials subjected to varying moisture levels and traffic loading.Read moreRead less
Behaviour of Tunnels in Sedimentary Rocks of the Sydney Basin. The aim of this project is to gain understanding of ground behaviour around tunnels in the Sydney region, how the ground interacts with fibre reinforced shotcrete tunnel linings, and how changes in material performance affect risk to users and the reliability of the tunnel structures. These aims will be met by a combination of field and laboratory experiments and theoretical modelling. The outcome will be a rational and reliable de ....Behaviour of Tunnels in Sedimentary Rocks of the Sydney Basin. The aim of this project is to gain understanding of ground behaviour around tunnels in the Sydney region, how the ground interacts with fibre reinforced shotcrete tunnel linings, and how changes in material performance affect risk to users and the reliability of the tunnel structures. These aims will be met by a combination of field and laboratory experiments and theoretical modelling. The outcome will be a rational and reliable design method for shotcrete lined tunnels in the Sydney basin.Read moreRead less