A close-range blast event can cause severe damage to building structures due to its ability to pr... more A close-range blast event can cause severe damage to building structures due to its ability to produce very high localised impulsive loads. Such events can result from explosives that are attached to the critical elements of a structure, backpack and suitcase explosives, and vehicle or parcel bombs targeting the key structural elements of buildings and bridges. Steel hollow sections are among the most commonly used prefabricated structural element types that are widely used in Australia. Therefore, adopting the necessary precautionary measures in the design of such elements against close-range blast is worthwhile to explore. This paper focuses on an experimental and numerical study performed on concrete-filled and hollow square tubular columns (100 x 5 mm SHS Grade C350) made out of cold-formed structural steel hollow sections (SHS) that were subjected to highly explosive TNT charges. The charges were placed above the top surface of the column at two different scaled stand-off dista...
In this study, a new turning rapid diffuser has been developed using CFD analyses. Typically the ... more In this study, a new turning rapid diffuser has been developed using CFD analyses. Typically the diffuser angle should be less than seven degrees, to avoid flow separation. This angle requirement cannot be satisfied when the diffuser length is restricted, such as in the design of a wind tunnel circuit, as a result of its overall dimension. A parametric investigation using ANSYS CFX 10 has found that the diffuser angle can be much larger, without creating flow separation, when the flow is diffused in a circular turning path. With this turning rapid diffuser, the flow has been shown to attach to the diffuser’s sidewalls, even when the diffuser angle is as large as 12 degrees. Flow separation still occurs from the inner surface in the turning direction, however further CFD analyses have indicated that this separation can be reduced by the addition of guide vanes along the turning flow path. The CFD results have been validated with a physical model before being used successfully in the construction of a closed circuit boundary layer wind tunnel at the Institute of Building Science and Technology (IBST) in Vietnam
This paper describes the blast loading trials on steel tubular members with and without concrete ... more This paper describes the blast loading trials on steel tubular members with and without concrete infill. The standoffs considered in this trial were selected to demonstrate the response of these steel sections to contact and very close-range detonations of high explosive (HE). The main objective of the trials was to investigate the effects of contact and near-field explosions on steel square tubular members and to demonstrate the effect of standoff variation on the mode of response and failure of steel square sections. The experimental data collected during these trials can be used for verification of theoretical and numerical models of response of steel tubular columns subjected to contact and close-range blasts. Due to difficulties with collecting quantitative data (displacements, blast pressures etc.) in the close proximity of a detonating HE charge, analysis of the steel tubes in this paper is confined mostly to qualitative assessment based on visual observations of the structur...
Http Dx Doi Org 10 1080 17538947 2015 1034201, Mar 26, 2015
ABSTRACT Flood damage assessment (FDA) is a key component of risk-based method for flood manageme... more ABSTRACT Flood damage assessment (FDA) is a key component of risk-based method for flood management. In the current FDA approaches, generally the uniqueness of the building is disregarded in the analysis. Therefore, they are unfit for detailed applications in which case-by-case analysis of building damage is an essential requirement. This limitation is compounded by the use of incomplete and often low quality data inputs about the building and the assumptions and approximations made regarding the geometry and materials of its components. Such shortcomings may result in an incomplete and uncertain outcomes. Considering the benefits and increasing use of 3D urban modeling and BIM in various urban management processes, in this paper, an integrated framework for utilization of detailed 3D building models for the assessment and 3D visualization of flood damage to building according to its distinct behavior against flood is presented. A proof-of-concept demonstration of the framework in a case study underlined the feasibility of implementation of the framework which can potentially benefit a variety of users and be used as a complementary approach to the current FDA methods for improving the resilience of the community towards floods and their adverse impacts.
The duration of blast pressure is significantly important along with its magnitude for dynamic re... more The duration of blast pressure is significantly important along with its magnitude for dynamic response of concrete elements. Pressure-Impulse (PI) diagrams which include both blast pressure magnitude and duration are often used in concrete damage assessment. Available ...
... This study is continuing at the University of Melbourne. Acknowledgments The data preparation... more ... This study is continuing at the University of Melbourne. Acknowledgments The data preparation for this study by Mr. Denny Teo is greatly appreciated. References ... 105, No. 11, November 1979, pp. 2243-2260. [3] MENDIS, P., and NGO, T., (2002) Assessment of tall buildings ...
This paper reviews current understanding of fluid-structure interaction effects that may be assoc... more This paper reviews current understanding of fluid-structure interaction effects that may be associated with Tsunami waves impacting on structural forms. Force models for wave-structure interaction currently adopted by coastal engineers for analysis and design of coastal structures are presented and their relative merits, shortcomings and applicability discussed in the context of Tsunami wave force effects on structures. In addition, the
A close-range blast event can cause severe damage to building structures due to its ability to pr... more A close-range blast event can cause severe damage to building structures due to its ability to produce very high localised impulsive loads. Such events can result from explosives that are attached to the critical elements of a structure, backpack and suitcase explosives, and vehicle or parcel bombs targeting the key structural elements of buildings and bridges. Steel hollow sections are among the most commonly used prefabricated structural element types that are widely used in Australia. Therefore, adopting the necessary precautionary measures in the design of such elements against close-range blast is worthwhile to explore. This paper focuses on an experimental and numerical study performed on concrete-filled and hollow square tubular columns (100 x 5 mm SHS Grade C350) made out of cold-formed structural steel hollow sections (SHS) that were subjected to highly explosive TNT charges. The charges were placed above the top surface of the column at two different scaled stand-off dista...
In this study, a new turning rapid diffuser has been developed using CFD analyses. Typically the ... more In this study, a new turning rapid diffuser has been developed using CFD analyses. Typically the diffuser angle should be less than seven degrees, to avoid flow separation. This angle requirement cannot be satisfied when the diffuser length is restricted, such as in the design of a wind tunnel circuit, as a result of its overall dimension. A parametric investigation using ANSYS CFX 10 has found that the diffuser angle can be much larger, without creating flow separation, when the flow is diffused in a circular turning path. With this turning rapid diffuser, the flow has been shown to attach to the diffuser’s sidewalls, even when the diffuser angle is as large as 12 degrees. Flow separation still occurs from the inner surface in the turning direction, however further CFD analyses have indicated that this separation can be reduced by the addition of guide vanes along the turning flow path. The CFD results have been validated with a physical model before being used successfully in the construction of a closed circuit boundary layer wind tunnel at the Institute of Building Science and Technology (IBST) in Vietnam
This paper describes the blast loading trials on steel tubular members with and without concrete ... more This paper describes the blast loading trials on steel tubular members with and without concrete infill. The standoffs considered in this trial were selected to demonstrate the response of these steel sections to contact and very close-range detonations of high explosive (HE). The main objective of the trials was to investigate the effects of contact and near-field explosions on steel square tubular members and to demonstrate the effect of standoff variation on the mode of response and failure of steel square sections. The experimental data collected during these trials can be used for verification of theoretical and numerical models of response of steel tubular columns subjected to contact and close-range blasts. Due to difficulties with collecting quantitative data (displacements, blast pressures etc.) in the close proximity of a detonating HE charge, analysis of the steel tubes in this paper is confined mostly to qualitative assessment based on visual observations of the structur...
Http Dx Doi Org 10 1080 17538947 2015 1034201, Mar 26, 2015
ABSTRACT Flood damage assessment (FDA) is a key component of risk-based method for flood manageme... more ABSTRACT Flood damage assessment (FDA) is a key component of risk-based method for flood management. In the current FDA approaches, generally the uniqueness of the building is disregarded in the analysis. Therefore, they are unfit for detailed applications in which case-by-case analysis of building damage is an essential requirement. This limitation is compounded by the use of incomplete and often low quality data inputs about the building and the assumptions and approximations made regarding the geometry and materials of its components. Such shortcomings may result in an incomplete and uncertain outcomes. Considering the benefits and increasing use of 3D urban modeling and BIM in various urban management processes, in this paper, an integrated framework for utilization of detailed 3D building models for the assessment and 3D visualization of flood damage to building according to its distinct behavior against flood is presented. A proof-of-concept demonstration of the framework in a case study underlined the feasibility of implementation of the framework which can potentially benefit a variety of users and be used as a complementary approach to the current FDA methods for improving the resilience of the community towards floods and their adverse impacts.
The duration of blast pressure is significantly important along with its magnitude for dynamic re... more The duration of blast pressure is significantly important along with its magnitude for dynamic response of concrete elements. Pressure-Impulse (PI) diagrams which include both blast pressure magnitude and duration are often used in concrete damage assessment. Available ...
... This study is continuing at the University of Melbourne. Acknowledgments The data preparation... more ... This study is continuing at the University of Melbourne. Acknowledgments The data preparation for this study by Mr. Denny Teo is greatly appreciated. References ... 105, No. 11, November 1979, pp. 2243-2260. [3] MENDIS, P., and NGO, T., (2002) Assessment of tall buildings ...
This paper reviews current understanding of fluid-structure interaction effects that may be assoc... more This paper reviews current understanding of fluid-structure interaction effects that may be associated with Tsunami waves impacting on structural forms. Force models for wave-structure interaction currently adopted by coastal engineers for analysis and design of coastal structures are presented and their relative merits, shortcomings and applicability discussed in the context of Tsunami wave force effects on structures. In addition, the
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