The Experts below are selected from a list of 2100 Experts worldwide ranked by ideXlab platform
P T Townsend - One of the best experts on this subject based on the ideXlab platform.
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analysis and experimental evaluation of in fill steel Stud Wall systems under blast loading
Journal of Structural Engineering-asce, 2005Co-Authors: H Salim, R Dina, P T TownsendAbstract:To be able to develop and advance blast-retrofit technologies, it is crucial first to be able to develop prediction methodologies and engineering design tools. Therefore, this paper will present the analytical modeling and experimental evaluation of steel-Stud Wall systems under blast loads. The results of the static full-scale Wall tests, as well as the component tests, are used to evaluate the structural performance of the Walls and provide recommendations for blast-retrofit systems. The analytical and experimental static results are used to develop the static resistance function for the Wall systems, which is incorporated into a single degree of freedom dynamic model. The dynamic model will enable designers to predict the level of performance of the Wall system under any explosion threat level. The analytical model conservatively predicted the measured field results with a maximum difference of 20%. The paper will discuss the performance of blast-retrofit Wall systems under static and dynamic field tests simulating large vehicle bombs.
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blast retrofit Wall systems using cold formed steel Studs
2003Co-Authors: H Salim, P T Townsend, Robe J Dina, Sam A Kiga, Jonatha ShullAbstract:Abstract : Blast-retrofit of in-fill Wall systems such as steel-Stud Walls is of current interest to the engineering community and government agencies. To be able to develop and advance blast-retrofit technologies, it is crucial first to be able to develop prediction methodologies and engineering design tools. Therefore, this paper will present the analytical modeling and experimental evaluation of steel-Stud Wall systems under blast loads. The results of the static full-scale Wall tests as well as the component tests are used to evaluate the structural performance of the Walls and provide recommendations for blast-retrofit systems. The analytical and experimental results are used to develop the static resistance function for the Wall systems, which is incorporated into a single degree of freedom (SDOF) dynamic model. The SDOF dynamic model of the Walls will enable designers to predict the level of performance of the Wall system under any explosion threat level. Such information is very valuable to engineers designing for explosion protection. The paper will discuss the performance of the blast-retrofit Wall systems under static and dynamic field tests.
H Salim - One of the best experts on this subject based on the ideXlab platform.
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analysis and experimental evaluation of in fill steel Stud Wall systems under blast loading
Journal of Structural Engineering-asce, 2005Co-Authors: H Salim, R Dina, P T TownsendAbstract:To be able to develop and advance blast-retrofit technologies, it is crucial first to be able to develop prediction methodologies and engineering design tools. Therefore, this paper will present the analytical modeling and experimental evaluation of steel-Stud Wall systems under blast loads. The results of the static full-scale Wall tests, as well as the component tests, are used to evaluate the structural performance of the Walls and provide recommendations for blast-retrofit systems. The analytical and experimental static results are used to develop the static resistance function for the Wall systems, which is incorporated into a single degree of freedom dynamic model. The dynamic model will enable designers to predict the level of performance of the Wall system under any explosion threat level. The analytical model conservatively predicted the measured field results with a maximum difference of 20%. The paper will discuss the performance of blast-retrofit Wall systems under static and dynamic field tests simulating large vehicle bombs.
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blast retrofit Wall systems using cold formed steel Studs
2003Co-Authors: H Salim, P T Townsend, Robe J Dina, Sam A Kiga, Jonatha ShullAbstract:Abstract : Blast-retrofit of in-fill Wall systems such as steel-Stud Walls is of current interest to the engineering community and government agencies. To be able to develop and advance blast-retrofit technologies, it is crucial first to be able to develop prediction methodologies and engineering design tools. Therefore, this paper will present the analytical modeling and experimental evaluation of steel-Stud Wall systems under blast loads. The results of the static full-scale Wall tests as well as the component tests are used to evaluate the structural performance of the Walls and provide recommendations for blast-retrofit systems. The analytical and experimental results are used to develop the static resistance function for the Wall systems, which is incorporated into a single degree of freedom (SDOF) dynamic model. The SDOF dynamic model of the Walls will enable designers to predict the level of performance of the Wall system under any explosion threat level. Such information is very valuable to engineers designing for explosion protection. The paper will discuss the performance of the blast-retrofit Wall systems under static and dynamic field tests.
Mahendran Mahen - One of the best experts on this subject based on the ideXlab platform.
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Load-bearing Walls made of cold-formed steel hollow section Studs exposed to fire
Independent Publishing Network, 2019Co-Authors: Tao Yunxiang, Mahendran Mahen, Ariyanayagam AnthonyAbstract:Light gauge steel frame (LSF) Walls are used as primary load-bearing components in cold -formed steel (CFS) buildings. With the use of CFS structures in the construction of mid-rise buildings, fire safety of LSF Walls has become a more critical issue for designers. This research project has investigated the fire performance of LSF Walls made of cold-formed square hollows section (SHS) Studs.A full-scale fire test was first conducted under standard fire conditions, and finite element (FE) models were then developed and validated. This paper presents the details of the fire test and FE modelling of SHS Stud Wall in fire and the results. Detailed comparisons between the results from the fire test and FE modelling, such as time-temperature profiles of SHS Studs and plasterboards, fire resistance level of the LSF Wall, Stud failure mode and deflections, are also presented in the paper
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Behaviour of load bearing double Stud LSF Walls in fire
'Elsevier BV', 2019Co-Authors: Magarabooshanam Harikrishnan, Ariyanayagam Anthony, Mahendran MahenAbstract:In the residential sector single Stud LSF Walls are commonly used as load bearing and non-load bearing Walls. But in situations where higher acoustic insulation levels and load bearing capacities are required, double Stud LSF Walls are used. However, fire performance of double Stud LSF Walls has not been investigated adequately unlike in the case of single Stud LSF Walls. There is insufficient research data on the fire performance of double Stud Wall systems. Therefore, this research investigated the fire performance of double Stud Walls under standard fire conditions using full scale test panels (3 m × 3 m) made of 90 mm lipped channel Studs. Three full-scale fire tests were conducted to investigate the fire performance of load bearing double Stud LSF Walls. The fire test results of double Stud LSF Walls were then compared with those of single Stud LSF Walls with varying Stud depth. The results revealed the presence of a unique heat transfer mechanism, resulting in an enhanced fire performance for double Stud Walls. The discontinuous Stud arrangement within the cavity of double Stud LSF Walls was identified as the main contributor for the delayed heat transfer mechanism. This paper presents the details of this research and its results. It has also shown that the Direct Strength Method (DSM) based fire design equations developed for single Stud LSF Walls can be used to predict the failure times of double Stud LSF Walls exposed to fire
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Fire tests of load bearing double Stud LSF Walls
Ulster University, 2018Co-Authors: Magarabooshanam Harikrishnan, Ariyanayagam Anthony, Mahendran MahenAbstract:Single Stud LSF Walls are commonly used as load bearing and non-load bearing structures in the residential sector. But in situations such as partition Walls, town houses, places where acoustic insulation and load carrying capacities required are higher, double Stud LSF Walls are used. Extensive research has been conducted on the fire performance of single Stud LSF Walls under various load ratios and the data is readily available. It included the effects of different layers of plasterboard, joint arrangements, various steel grades and thicknesses of lipped channel section Studs under standard and realistic design fire curves. However, there is inadequate research data on the fire performance of double Stud Wall systems. This research therefore investigated the fire and structural performance of double Stud Walls using full scale ISO834-1 standard fire tests of two 3m x 3m LSF Walls made of 90mm lipped channel Studs. The fire test results of the double Stud LSF Wall systems are then compared with the fire test results of single Stud LSF Walls with varying Stud depth. This paper presents the results of this investigation and the results
Lin Wang - One of the best experts on this subject based on the ideXlab platform.
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Stochastic modelling of hygrothermal performance of highly insulated wood framed Walls
Building and Environment, 2018Co-Authors: Lin WangAbstract:Abstract As energy consumption has become an important issue in building design, most building codes require a higher insulation level for building envelopes to improve the building's energy efficiency. However, the highly insulated Walls may lead to a higher risk of moisture problems. Although hygrothermal simulation has been widely used to investigate the moisture performance of wood framed Walls, the uncertainties of input parameters such as material properties, boundary conditions and moisture loads, may lead to discrepancies between simulation results and actual performance of the envelope. This paper investigates the hygrothermal performance of highly insulated wood framed Walls using a stochastic approach, which combines the Latin Hypercube Sampling method and Factorial Design to take into account the uncertainties of material properties, boundary conditions and moisture loads (air leakage and rain leakage). The investigated Walls include an I-joist deep cavity Wall, two exterior insulated Walls, and a conventional 2 × 6 Stud Wall as the baseline. It is found that under the moisture loads introduced (i.e. air leakage and rain leakage), the exterior insulated Walls have a lower mold growth risk than the deep cavity Wall and the 2 × 6 Stud baseline Wall. The uncertainties of material properties do not result in significant variations in simulation results such as moisture content and mold growth index as uncertainties of moisture loads do. The hygrothermal performance of these highly insulated Walls is more sensitive to moisture loads and the significance of the moisture loads (air leakage and rain leakage) depends on climatic conditions.
Mahen Mahendran - One of the best experts on this subject based on the ideXlab platform.
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experimental Studies of non load bearing steel Wall systems under fire conditions
Fire Safety Journal, 2012Co-Authors: Prakash Kolarkar, Mahen MahendranAbstract:Fire safety of buildings has been recognised as very important by the building industry and the community at large. Traditionally, increased fire rating is provided by simply adding more plasterboards to light gauge steel frame (LSF) Walls, which is inefficient. Many research Studies have been undertaken to investigate the thermal behaviour of traditional LSF Stud Wall systems under standard fire conditions. However, no research has been undertaken on the thermal behaviour of LSF Stud Walls using the recently proposed composite panel. Extensive fire testing of both non-load bearing and load bearing Wall panels was conducted in this research based on the standard time-temperature curve in AS1530.4. Three groups of LSF Wall specimens were tested with no insulation, cavity insulation and the new composite panel based on an external insulation layer between plasterboards. This paper presents the details of this experimental Study into the thermal performance of non-load bearing Walls lined with various configurations of plasterboard and insulation. Extensive descriptive and numerical results of the tested non-load bearing Wall panels given in this paper provide a thorough understanding of their thermal behaviour, and valuable time-temperature data that can be used to validate numerical models. Test results showed that the innovative composite Stud Wall systems outperformed the traditional Stud Wall systems in terms of their thermal performance, giving a much higher fire rating.
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fire tests of load bearing steel Stud Walls exposed to real building fires
Science & Engineering Faculty, 2012Co-Authors: Anthony Deloge Ariyanayagam, Mahen MahendranAbstract:Abstract. Fire resistance has become an important part in structural design due to the ever increasing loss of properties and lives every year. Conventionally the fire rating of load bearing Light gauge Steel Frame (LSF) Walls is determined using standard fire tests based on the time-temperature curve given in ISO 834 [1]. Full scale fire testing based on this standard time-temperature curve originated from the application of wood burning furnaces in the early 1900s and it is questionable whether it truly represents the fuel loads in modern buildings. Hence a detailed fire research Study into the performance of LSF Walls was undertaken using real design fires based on Eurocode parametric curves [2] and Barnett’s ‘BFD’ curves [3]. This paper presents the development of these real fire curves and the results of full scale experimental Study into the structural and fire behaviour of load bearing LSF Stud Wall systems.
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thermal performance of plasterboard lined steel Stud Walls
Recent research and developments in cold-formed steel design and construction, 2008Co-Authors: Prakash Kolarkar, Mahen MahendranAbstract:In response to the market demand for fire separations in the light industrial, commercial and residential buildings, a research project is currently under way to improve the thermal performance of cold-formed steel Stud Wall systems used in these buildings. Extensive fire testing of both non-load-bearing and load-bearing Wall panels has been completed to date in the Fire Research Laboratory of Queensland University of Technology. This paper presents the details of this experimental Study into the thermal performance of some small scale non-load-bearing Walls lined with dual layers of plasterboard and insulation. The first two Wall panels were built traditionally using lipped channels with two plasterboard linings on both sides and the cavity filled with and without glass fibre insulation. The third panel tested was built similarly, but with the insulation sandwiched between the plasterboards on either side of the steel Wall frame instead of being placed in the cavity. Fire tests undertaken were based on the standard time-temperature curve recommended by AS 1530.4 (SA, 2005). Experimental results showed that the new Stud Wall system outperformed the traditional Stud Wall system giving a much higher fire rating.
