The Experts below are selected from a list of 63312 Experts worldwide ranked by ideXlab platform
M L Romero - One of the best experts on this subject based on the ideXlab platform.
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analytical approach to failure surfaces in reinforced concrete Sections subjected to axial loads and biaxial bending
Journal of Structural Engineering-asce, 2004Co-Authors: J L Bonet, P F Miguel, M A Fernandez, M L RomeroAbstract:This paper proposed an analytical approach to calculating failure surfaces in rectangular reinforced concrete cross Sections with symmetrical reinforcement when submitted to axial loads and biaxial bending. The analytical method is valid for concrete with a strength of between 25 and 80 MPa. The failure surface is obtained by means of reference generatrices that lie on two directrices corresponding to two known axial loads and on the maximum and minimum axial Capacity of the Section. The proposed expression was assessed with results obtained from experimental tests (from the literature) and from a numerical model. This approach enables the Section Capacity to be verified and the reinforcement designed to a sufficient degree of accuracy for everyday professional practice. The method is easy to use and may be extensively applied to reinforced concrete columns in buildings.
Leroy Gardner - One of the best experts on this subject based on the ideXlab platform.
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testing and design of aluminum alloy cross Sections in compression
Journal of Structural Engineering-asce, 2014Co-Authors: Meini Su, Ben Young, Leroy GardnerAbstract:AbstractAluminum alloys are used in a wide range of engineering applications and are gaining increasing usage in the construction sector, offering high strength-to-weight ratios and good durability. In this paper, a series of stub-column tests on aluminum alloy box Sections with and without internal cross stiffeners is carried out to investigate cross-Section Capacity and to explore the possible exploitation of strain hardening in design. All existing stub-column test results from the literature were also collected. A database containing the results from 346 tests on aluminum alloy stub columns of box, channel, and angle Sections, with a wide range of cross-Section slendernesses, was formed. The test strengths were compared with the design strengths predicted by the current American, Australian/New Zealand, and European specifications. Furthermore, the test strengths were compared with those predicted by the deformation-based continuous strength method (CSM). Following reliability analyses, the design str...
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structural design of stainless steel concrete filled columns
Journal of Constructional Steel Research, 2008Co-Authors: Leroy GardnerAbstract:a b s t r a c t This paper presents the behaviour and design of axially loaded concrete filled stainless steel circular and square hollow Sections. The experimental investigation was conducted using different concrete cube strengths varied from 30 to 100 MPa. The column strengths and load-axial shortening curves were evaluated. The study is limited to cross-Section Capacity and has not been validated at member level. Comparisons of the tests results together with other available results from the literature have been made with existing design methods for composite carbon steel Sections — Eurocode 4 and ACI. It was found that existing design guidance for carbon steel may generally be safely applied to concrete filled stainless steel tubes, though it tends to be over-conservative. A continuous strength method is proposed and it is found to provide the most accurate and consistent prediction of the axial Capacity of the composite concrete filled stainless steel hollow Sections due largely to the more precise assessment of the contribution of the stainless steel tube to the composite resistance.
J L Bonet - One of the best experts on this subject based on the ideXlab platform.
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analytical approach to failure surfaces in reinforced concrete Sections subjected to axial loads and biaxial bending
Journal of Structural Engineering-asce, 2004Co-Authors: J L Bonet, P F Miguel, M A Fernandez, M L RomeroAbstract:This paper proposed an analytical approach to calculating failure surfaces in rectangular reinforced concrete cross Sections with symmetrical reinforcement when submitted to axial loads and biaxial bending. The analytical method is valid for concrete with a strength of between 25 and 80 MPa. The failure surface is obtained by means of reference generatrices that lie on two directrices corresponding to two known axial loads and on the maximum and minimum axial Capacity of the Section. The proposed expression was assessed with results obtained from experimental tests (from the literature) and from a numerical model. This approach enables the Section Capacity to be verified and the reinforcement designed to a sufficient degree of accuracy for everyday professional practice. The method is easy to use and may be extensively applied to reinforced concrete columns in buildings.
Kim J R Rasmussen - One of the best experts on this subject based on the ideXlab platform.
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distortional global interaction buckling of stainless steel c beams part i experimental investigation
Journal of Constructional Steel Research, 2014Co-Authors: Kim J R Rasmussen, Shuang Niu, Feng FanAbstract:Abstract This paper presents experimental data for cold-formed stainless steel lipped channel beams featuring distortional–global interaction buckling. Three stainless steel alloys were employed in the tests, namely austenitic S30401, ferritic S44330 and lean duplex S32101. Coupon tests were carried out to determine the mechanical properties of the virgin sheet material as well as the work-hardened corner material of the press-braked Sections. Geometric imperfections were measured for each specimen prior to testing. A total of 32 specimens were tested under four-point bending, six of which were tested with lateral bracing in order to determine the Section Capacity. The remaining 26 specimens, with spans ranging from 1.8 m to 4.0 m, were tested in a specially devised test set-up. The set-up featured a dual-actuator gravity simulator, flexible load-applying frames and idealized end support conditions, all of which contributed to minimizing uncertainties in the tests, thereby affording benchmark tests for analytical and numerical studies. Interaction buckling was observed in all tests of unbraced members.
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Section Capacity of thin walled i Section beam columns
Journal of Structural Engineering-asce, 1998Co-Authors: Anthony S Hasham, Kim J R RasmussenAbstract:This paper describes two series of tests performed on slender I-Sections fabricated from high-strength steel plates by welding. Eight tests were conducted on each series. The objectives of the test program were to determine the Section capacities and the shape of the interaction curves for two slender I-Sections subjected to compression and major axis bending and to compare the results with design strength predictions by codes of practice. The study focused on the shape of the interaction curves and whether the curves used in the main codes of practice, which are largely based on compact or semicompact cross Sections, are also applicable to slender cross Sections. Generally, the design axial and bending Section capacities predicted by the main codes of practice were conservative, as were the design interaction curves. The experimental interaction curves were close to linear for both test series. This is in agreement with the design interaction curves given by the Australian, British, and European specifications for steel structures. However, the use of a bilinear interaction curve, as stipulated in the American specification, was not evident in the test results.
Xiao Ling Zhao - One of the best experts on this subject based on the ideXlab platform.
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the effect of elevated temperatures on the compressive Section Capacity of pultruded gfrp profiles
Construction and Building Materials, 2020Co-Authors: Mohammad Houshmand Khaneghahi, Esmaeil Pournamazian Najafabadi, Milad Bazli, Asghar Vatani Oskouei, Xiao Ling ZhaoAbstract:Abstract The compressive performance of glass fiber reinforced polymer (GFRP) profiles subjected to elevated temperature was investigated through a large number of (3 0 0) tests. The effects of profile cross-Sectional area, slenderness, and temperature on the behavior of the GFRP profiles at temperatures ranging from 25 to 400 °C were determined. It was observed that the compressive strength of the GFRP profiles has been decreased by half as the temperature exceeded 90 °C, i.e., close to the glass transition temperature of the matrix. The temperature and ratio of cross-Sectional area to external perimeter were determined as two major parameters affecting Section Capacity.
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design of short cfrp reinforced steel tubular columns
Journal of Constructional Steel Research, 2011Co-Authors: Jimmy Haedir, Xiao Ling ZhaoAbstract:Abstract This paper presents the design and experimental evaluation of externally bonded carbon fibre-reinforced polymer (CFRP) sheets for strengthening circular steel tubular short columns. In addition to its ease of handling due to its light weight, the high-strength CFRP sheet can provide a degree of restraint to delay buckling of the thin steel wall. Ten short cold-formed steel circular hollow Section (CHS) columns, with externally bonded orthogonal (hoop and longitudinal) CFRP sheets, were tested under axial compression. The experimental results indicate that enhancement of the axial Section Capacity is possible by fibre-reinforcing the steel tube. The design variables investigated to evaluate the strengthening efficiency include the steel yield strength, the modulus of elasticity of the hoop fibre, and the amount and configuration of the fibre reinforcement. Design curves predicting the Section Capacity of composite steel–CFRP tubular short columns are calculated based on current design guidelines for steel columns. The results highlight the ease of the use of such curves in the FRP strengthening or retrofitting design of tubular columns for Section Capacity enhancement.
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Section Capacity of very high strength (VHS) circular tubes under compression
Thin-Walled Structures, 2000Co-Authors: Xiao Ling ZhaoAbstract:This paper investigates the Section Capacity of very high strength (VHS®) circular tubes under compression. Full-Section tensile tests were performed to determine the Young's modulus of elasticity, tensile yield stress and ultimate tensile strength. The modulus of elasticity was found around 200,000 MPa, the tensile yield stress (0.2% proof stress) was around 1350 MPa and the ultimate tensile strength was around 1500 MPa. Twelve stub column tests were carried out. The plate element slenderness varies from 86 to 130. It has been demonstrated that the limits on local buckling in most existing design standards are conservative when applied to VHS circular tubes. The reliability of Section Capacity based on the full effective Section model has been verified using a FOSM (first order second moment) approach.