The Experts below are selected from a list of 25173 Experts worldwide ranked by ideXlab platform
Richard Sause - One of the best experts on this subject based on the ideXlab platform.
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finite element analysis of curved steel girders with tubular Flanges
Engineering Structures, 2010Co-Authors: Jun Dong, Richard SauseAbstract:A tubular Flange girder is an I-shaped steel girder with either rectangular or round tubes as Flanges. A tubular Flange girder has a much larger torsional stiffness than a conventional I-shaped plate girder and less potential for cross section distortion than a box-girder, and is, therefore, an interesting alternative girder for horizontally curved steel bridges. Finite element (FE) models of curved tubular Flange girders are presented in this paper, considering material inelasticity, second-order effects, initial geometric imperfections, and residual stresses. A parametric study is performed using the FE models to study the effects of stiffeners, tube diaphragms, geometric imperfections, residual stresses, and cross section dimensions on the load capacity of curved tubular Flange girders. Finally, the FE results for curved tubular Flange girders are compared with results for corresponding curved I-shaped plate girders, and the advantages of tubular Flange girders are summarized.
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flexural strength of tubular Flange girders
Journal of Constructional Steel Research, 2009Co-Authors: Jun Dong, Richard SauseAbstract:Abstract A tubular Flange girder is an I-shaped steel girder with either rectangular or round tubes as Flanges. A tubular Flange girder has a much larger torsional stiffness than a conventional I-shaped plate girder of similar weight, which results in a much larger lateral–torsional buckling strength. Finite element (FE) models of tubular Flange girders with hollow tubes (HTFGs) are developed in this paper, considering material inelasticity, instability, initial geometric imperfections, and residual stresses. A parametric study is performed using the FE models to study the effects of stiffeners, geometric imperfections, residual stresses, cross section dimensions, and bending moment distribution on the lateral–torsional buckling flexural strength of HTFGs. These analytical results are used to evaluate formulas for determining the flexural strength of HTFGs.
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lateral torsional buckling strength of tubular Flange girders
Journal of Structural Engineering-asce, 2008Co-Authors: Bonggyun Kim, Richard SauseAbstract:I-shaped steel girders with tubular Flanges have been studied for application in highway bridges because of their large lateral torsional buckling (LTB) strength relative to conventional I-shaped steel plate girders. This paper discusses the LTB strength of tubular Flange girders, focusing on concrete-filled tubular Flange girders (CFTFGs) where the concrete-filled tube is the compression Flange. Using finite-element (FE) models of CFTFGs, a parametric study was conducted to investigate the influence of girder geometry and material strength on the LTB strength. Design flexural strength formulas, considering LTB, for construction conditions and for ultimate strength in the final constructed condition, were developed based on the results of the parametric study. These formulas estimate the LTB strength of CFTFGs that are perfectly braced laterally and torsionally at brace points. A similar FE study of conventional I-girders was conducted and the results are compared with those of CFTFGs.
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analysis of Flange transverse bending of corrugated web i girders under in plane loads
Journal of Structural Engineering-asce, 2007Co-Authors: Hassan H Abbas, Richard Sause, Robert G DriverAbstract:This paper presents theoretical, experimental, and finite-element analysis results for the linear elastic behavior of corrugated web steel I-girders under in-plane loads. A typical corrugated web steel I-girder consists of two steel Flanges welded to a corrugated steel web. Previous research has shown that a corrugated web I-girder under primary moment and shear cannot be analyzed using conventional beam theory alone, and a Flange transverse bending analysis is required. A theoretical method, the fictitious load method, is presented herein as an analytical tool for quantifying Flange transverse bending in corrugated web I-girders. To validate this method, four-point bending experimental results for a large-scale corrugated web I-girder are presented. The measured Flange transverse displacements and Flange stresses were in good agreement with the theoretical results especially in regions of constant shear. To gain additional insight, finite- element analysis results for the test girder are presented, and compared to both the experimental and theoretical results.
Robert G Driver - One of the best experts on this subject based on the ideXlab platform.
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analysis of Flange transverse bending of corrugated web i girders under in plane loads
Journal of Structural Engineering-asce, 2007Co-Authors: Hassan H Abbas, Richard Sause, Robert G DriverAbstract:This paper presents theoretical, experimental, and finite-element analysis results for the linear elastic behavior of corrugated web steel I-girders under in-plane loads. A typical corrugated web steel I-girder consists of two steel Flanges welded to a corrugated steel web. Previous research has shown that a corrugated web I-girder under primary moment and shear cannot be analyzed using conventional beam theory alone, and a Flange transverse bending analysis is required. A theoretical method, the fictitious load method, is presented herein as an analytical tool for quantifying Flange transverse bending in corrugated web I-girders. To validate this method, four-point bending experimental results for a large-scale corrugated web I-girder are presented. The measured Flange transverse displacements and Flange stresses were in good agreement with the theoretical results especially in regions of constant shear. To gain additional insight, finite- element analysis results for the test girder are presented, and compared to both the experimental and theoretical results.
Hassan H Abbas - One of the best experts on this subject based on the ideXlab platform.
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analysis of Flange transverse bending of corrugated web i girders under in plane loads
Journal of Structural Engineering-asce, 2007Co-Authors: Hassan H Abbas, Richard Sause, Robert G DriverAbstract:This paper presents theoretical, experimental, and finite-element analysis results for the linear elastic behavior of corrugated web steel I-girders under in-plane loads. A typical corrugated web steel I-girder consists of two steel Flanges welded to a corrugated steel web. Previous research has shown that a corrugated web I-girder under primary moment and shear cannot be analyzed using conventional beam theory alone, and a Flange transverse bending analysis is required. A theoretical method, the fictitious load method, is presented herein as an analytical tool for quantifying Flange transverse bending in corrugated web I-girders. To validate this method, four-point bending experimental results for a large-scale corrugated web I-girder are presented. The measured Flange transverse displacements and Flange stresses were in good agreement with the theoretical results especially in regions of constant shear. To gain additional insight, finite- element analysis results for the test girder are presented, and compared to both the experimental and theoretical results.
Poologanathan Keerthan - One of the best experts on this subject based on the ideXlab platform.
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Numerical simulation and design of stainless steel hollow Flange beams under shear
'Elsevier BV', 2021Co-Authors: Dissanayake Mudiyanselage Madhushan, Poologanathan Keerthan, Zhou C., Gunalan S., Tsavdaridis K.d., Guss J.Abstract:Stainless steel offers a range of benefits over conventional carbon steel in structural applications. This paper presents the detailed numerical modelling of shear response of cold-formed stainless steel hollow Flange sections using finite element software package, Abaqus. The effect of geometric parameters such as section height and section thickness, and the influence of different steel grades were investigated following the validation of finite element models. From numerical results, the formation of diagonal tension fields can be clearly observed in the webs of rectangular hollow Flange sections while more even distribution of the stresses in the webs is seen in triangular hollow Flange sections. Further, a plastic hinge type mechanism is formed in triangular Flanges at the post-failure region. The evaluation of Eurocode 3 and the direct strength method shear design provisions for stainless steel hollow Flange beams is found to be significantly conservative. Therefore, modified provisions were proposed and the comparison of those with finite element results confirmed the accurate and consistent shear resistance predictions over the codified provisions
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Experimental Shear Study of Rivet-Fastened Rectangular Hollow Flange Channel Beams with Web Openings
'American Society of Civil Engineers (ASCE)', 2018Co-Authors: Poologanathan Keerthan, Mahendran Mahen, Wanniarachchi SomadasaAbstract:The rivet-fastened rectangular hollow Flange channel beam (RHFCB) is a new cold-formed steel section and is considered to be a substitute for welded hollow Flange channel beams. This monosymmetric channel section is made from two torsionally rigid rectangular hollow Flanges connected to a web plate using rivets at intermittent spacing. This fabrication process allows great flexibility in selecting different combinations of web and Flange element sizes to attain optimum design capacities. Although the shear behavior of the commonly used lipped channel beam (LCB) and welded hollow Flange beam (HFB) sections, with and without web openings, has been investigated previously, the shear strength and behavior of rivet-fastened RHFCBs with web openings have not been investigated yet. Therefore a series of shear tests was conducted to investigate the shear behavior and strength of rivet-fastened RHFCBs with circular web openings. Simply supported test specimens with aspect ratios of 1.0 and 1.5 were loaded at midspan until failure. The shear capacities determined from the tests were compared with those predicted by current cold-formed steel design standards. The results revealed that the existing design equations were not able to accurately predict the shear capacities of rivet-fastened RHFCBs with circular web openings. This is mainly due to the shear buckling capacity improvements provided by the rectangular hollow Flanges and associated postbuckling strength. Hence the shear strength capacity results were used to propose improved design equations for rivet-fastened RHFCBs with circular web openings. This paper presents the details of the shear tests, observations, design capacity comparison, and proposed design equations
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section moment capacity tests of rivet fastened rectangular hollow Flange channel beams
Journal of Constructional Steel Research, 2016Co-Authors: Ropalin Siahaan, Mahen Mahendran, Poologanathan KeerthanAbstract:This paper presents the details of an experimental investigation on the section moment capacities of rivet fastened Rectangular Hollow Flange Channel Beams (RHFCB). The rivet fastened RHFCB is a new type of cold-formed steel section, an extension to the widely researched hollow Flange beams, shown to have capacities more typically associated with hot-rolled steel beams. It is characterized by a unique geometry, consisting of two rectangular hollow Flanges and a web. Unlike other cold-formed sections, the RHFCB has improved capacity due to its mono-symmetric shape and the absence of free edges. The RHFCB manufacturing involves fastening two hollow Flanges to a web, utilizing inexpensive intermittent self-pierced rivet fastening. This enables designers to develop optimum sections with varying web and Flange thicknesses, therefore delaying the onset of other buckling failures due to slender web element. Various researches have been carried out to investigate the behavior of continuously welded hollow Flange beams but little is known on the behavior of RHFCBs. Hence this paper investigates the section moment capacities of rivet fastened RHFCBs. Fifteen section moment capacity tests were conducted to investigate the behavior of RHFCB flexural members. The reduction in section moment capacities from having continuous weld to intermittent rivet connection at its web-Flange junction was also investigated. The ultimate moment capacities from the tests were compared with current steel design standards: AS/NZS 4600, AS 4100 and AISI S100. The paper also explores the suitability of the Direct Strength Method, with modification being proposed, from the results obtained from this investigation.
Mahendran Mahen - One of the best experts on this subject based on the ideXlab platform.
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Experimental Study of Unlipped Channel Beams Subject to Web Crippling Under One Flange Load Cases
Hong Kong Institute of Steel Construction, 2019Co-Authors: Gunalan Shanmuganathan, Mahendran MahenAbstract:Cold-formed steel members are becoming increasingly popular in the building industry due to their superior strength to weight ratio and ease of fabrication as opposed to hot-rolled steel members. However, they are susceptible to various buckling modes at stresses below the yield stress of the member because of their relatively high width-to-thickness ratio. Web crippling is one of the failure modes that occurs in steel channel sections under transverse concentrated loads or reactions. Recently a test method has been proposed by AISI to obtain the web crippling capacities under both one-Flange and two-Flange load cases. Using this test method 21 tests were conducted in this research to investigate the web crippling behaviour and strengths of an unlipped channel section with stocky webs known as DuraGal Channels under end-one-Flange (EOF) and interior one-Flange (IOF) load cases. DuraGal channels with different web slenderness and bearing lengths were tested with their Flanges unfastened to supports. In this research the suitability of the currently available design rules for unlipped channels subject to web crippling under one Flange load cases was investigated, and suitable modifications were proposed where necessary. This paper presents the details of this experimental study and the results.No Full Tex
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Experimental study of unlipped channel beams subject to web crippling under one Flange load cases
'Hong Kong Institute of Steel Construction', 2019Co-Authors: Gunalan Shanmuganathan, Mahendran MahenAbstract:Cold-formed steel members are becoming increasingly popular in the building industry due to their superior strength to weight ratio and ease of fabrication as opposed to hot-rolled steel members. However, they are susceptible to various buckling modes at stresses below the yield stress of the member because of their relatively high width-to-thickness ratio. Web crippling is one of the failure modes that occurs in steel channel sections under transverse concentrated loads or reactions. Recently a test method has been proposed by AISI to obtain the web crippling capacities under both one-Flange and two-Flange load cases. Using this test method 21 tests were conducted in this research to investigate the web crippling behaviour and strengths of an unlipped channel section with stocky webs known as DuraGal Channels under end-one-Flange (EOF) and interior one-Flange (IOF) load cases. DuraGal channels with different web slenderness and bearing lengths were tested with their Flanges unfastened to supports. In this research the suitability of the currently available design rules for unlipped channels subject to web crippling under one Flange load cases was investigated, and suitable modifications were proposed where necessary. This paper presents the details of this experimental study and the results
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Experimental Shear Study of Rivet-Fastened Rectangular Hollow Flange Channel Beams with Web Openings
'American Society of Civil Engineers (ASCE)', 2018Co-Authors: Poologanathan Keerthan, Mahendran Mahen, Wanniarachchi SomadasaAbstract:The rivet-fastened rectangular hollow Flange channel beam (RHFCB) is a new cold-formed steel section and is considered to be a substitute for welded hollow Flange channel beams. This monosymmetric channel section is made from two torsionally rigid rectangular hollow Flanges connected to a web plate using rivets at intermittent spacing. This fabrication process allows great flexibility in selecting different combinations of web and Flange element sizes to attain optimum design capacities. Although the shear behavior of the commonly used lipped channel beam (LCB) and welded hollow Flange beam (HFB) sections, with and without web openings, has been investigated previously, the shear strength and behavior of rivet-fastened RHFCBs with web openings have not been investigated yet. Therefore a series of shear tests was conducted to investigate the shear behavior and strength of rivet-fastened RHFCBs with circular web openings. Simply supported test specimens with aspect ratios of 1.0 and 1.5 were loaded at midspan until failure. The shear capacities determined from the tests were compared with those predicted by current cold-formed steel design standards. The results revealed that the existing design equations were not able to accurately predict the shear capacities of rivet-fastened RHFCBs with circular web openings. This is mainly due to the shear buckling capacity improvements provided by the rectangular hollow Flanges and associated postbuckling strength. Hence the shear strength capacity results were used to propose improved design equations for rivet-fastened RHFCBs with circular web openings. This paper presents the details of the shear tests, observations, design capacity comparison, and proposed design equations
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Section compression capacity of high strength cold-formed hollow Flange channels
'Elsevier BV', 2017Co-Authors: Sivakumar Kesawan, Mahendran MahenAbstract:Thin-walled cold-formed hollow Flange channel (HFC) sections are increasingly becoming popular due to their potential benefits such as increase in buckling capacities provided by the presence of two torsionally rigid hollow Flanges and the elimination of free edges. Past research studies of HFC sections were limited to their shear and bending capacities. This paper investigates their section compression capacities through a series of stub column tests, followed by finite element modelling of welded HFC columns. The developed finite element models were validated using experimental results, and then used to investigate the section compression capacity of HFCs made by welding rectangular sections to a steel plate or cold-forming and rivet/screw fastening to hollow Flanges, where steel plates with different strengths and thicknesses were used as web and Flange elements. Extensive structural performance data of HFC stub columns subject to local buckling was thus obtained covering the effects of varying slenderness of plate elements and the use of different strength steels for web and Flange elements. Furthermore, the applicability of the available design rules such as effective width and direct strength methods to predict the compression capacity of such HFC sections was also evaluated. Suitable recommendations are then proposed to improve their accuracy. This study facilitates and advances the use of HFC sections as compression members
