The Experts below are selected from a list of 4275 Experts worldwide ranked by ideXlab platform
Mahen Mahendran - One of the best experts on this subject based on the ideXlab platform.
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Comparative life cycle costs for new steel Portal Frame building systems
2002Co-Authors: Netra Gurung, Mahen MahendranAbstract:Life cycle costs of a new steel Portal Frame building system incorporating energy efficient sandwich panels are compared with those of a conventional steel Portal Frame building system for use in industrial and commercial buildings. The economic benefits of the new building system have been demonstrated through cost assessment of energy in use. The results from life cycle cost analysis of both the new and conventional Portal Frame building systems indicate that, despite slightly higher initial costs, the new building system costs significantly less than the conventional system over its complete life cycle of 50 years. The new system provides improved economic performance along with a more energy-efficient model for commercial/industrial building design in the Australian climate.
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Three-dimensional modeling of steel Portal Frame buildings
Science & Engineering Faculty, 1999Co-Authors: Mahen Mahendran, Costin MoorAbstract:The realistic strength and deflection behavior of industrial and commercial steel Portal Frame buildings are understood only if the effects of rigidity of end Frames and profiled steel claddings are included. The conventional designs ignore these effects and are very much based on idealized two-dimensional (2D) Frame behavior. Full-scale tests of a 1212 m steel Portal Frame building under a range of design load cases indicated that the observed deflections and bending moments in the Portal Frame were considerably different from those obtained from a 2D analysis of Frames ignoring these effects. Three-dimensional (3D) analyses of the same building, including the effects of end Frames and cladding, were carried out, and the results agreed well with full-scale test results. Results clearly indicated the need for such an analysis and for testing to study the true behavior of steel Portal Frame buildings. It is expected that such a 3D analysis will lead to lighter steel Frames as the maximum moments and deflections are reduced.
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Full scale experiments of a steel Portal Frame building
Science & Engineering Faculty, 1998Co-Authors: Timothy Heldt, Mahen MahendranAbstract:While numerous full scale experimental programs have been conducted around the world over the past 50 years to investigate the behaviour of steel Portal Frame buildings, none have comprehensively investigated the behaviour of such buildings under wind uplift. Wind uplift loads often govern designs in the Australian environment and this became the subject of a recent research project at Queensland University of Technology (OUT). This paper describes the full scale experiments on a steel Portal Frame building subject to wind uplift, racking and gravity loads. The Portal rafter and column members utilised hollow flange beam (HFB) sections [5-8] though the paper's findings on the theoretical and experimental building responses relate to conventional types of steel Portal Frame buildings.
Tsutomu Usami - One of the best experts on this subject based on the ideXlab platform.
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simplified seismic design approach for steel Portal Frame piers with hysteretic dampers
Earthquake Engineering & Structural Dynamics, 2007Co-Authors: Zhiyi Chen, Akira Kasai, Tsutomu UsamiAbstract:A simplified seismic design procedure for steel Portal Frame piers installed with hysteretic dampers is proposed, which falls into the scope of performance-based design philosophy. The fundamental goal of this approach is to design a suite of hysteretic damping devices for existing and new bridge piers, which will assure a pre-defined target performance against future severe earthquakes. The proposed procedure is applicable to multi-degree-of-freedom systems, utilizing an equivalent single-degree-of-freedom methodology with nonlinear response spectra (referred to as strength-demanded spectra) and a set of formulae of close-form expressions for the distribution of strength and stiffness produced in the structure by the designed hysteretic damping devices. As an illustrative example, the proposed procedure is applied to a design of a simple steel bridge pier of Portal Frame type with buckling-restrained braces (one of several types of hysteretic dampers). For the steel Portal Frame piers, an attempt is made to utilize not only the displacement-based index but also the strain-based index as pre-determined target performance at the beginning of design. To validate this procedure, dynamic inelastic time-history analyses are performed using the general-purpose finite element program ABAQUS. The results confirm that the proposed simplified design procedure attains the expected performance level as specified by both displacement-based and strain-based indices with sufficient accuracy. Copyright © 2006 John Wiley & Sons, Ltd.
Dengfeng Wang - One of the best experts on this subject based on the ideXlab platform.
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Internal Force Evaluation of Portal Frame with Tapered Members
Journal of Residuals Science & Technology, 2016Co-Authors: Dengfeng WangAbstract:To obtain the accurate expression of the internal force of the single-span Portal Frame being composed of tapered members, the force method was used to solve internal force of the Portal Frame with both hinged ends in consideration of various possible loads in practical projects. Gauss numerical integration method was used to simplify the complex integration when the deformation energy was calculated. Under the precondition of satisfied accuracy, the explicit expression of horizontal reaction force was obtained. Furthermore, the bending moment, shear and axial force could be solved for arbitrary section of tapered members. The research work can be used as the reference for evaluation of Portal Frame members, the programming of Portal Frame design codes and the further optimization of members. Keywords: Tapered member; internal force evaluation; force method; numerical integration
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Internal Force Evaluation of Non-Uniform Beam in Portal Frame
Applied Mechanics and Materials, 2013Co-Authors: Wen Wen Jia, Dengfeng WangAbstract:To simplify the internal force evaluation of Portal Frame being composed of non-uniform members, the force method was used to solve internal force of every key section of the non-uniform beam in Portal Frame with single-span. Gauss numerical integration method was used to simplify the complex integration when the deformation energy was calculated. Under the precondition of satisfied accuracy, the direct expressions of bending momentshear force and axial force of every key section of beam were obtained. The research work can be used as reference for the evaluation and design of Portal Frame members.
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Study of Bracing Force Acting at Mid-Span of Beam of Single-Span Portal Frame
Applied Mechanics and Materials, 2013Co-Authors: Wen Wen Jia, Dengfeng WangAbstract:The brace at the mid-span of beam of Portal Frame provides lateral constraint and improves its overall stability. By the nonlinear finite element method, the influences of structural parameters on the required bracing force for the beam bearing ultimate load were investigated when only one brace acting on the upper flange of beam at mid-span. The bracing force is correlated to the failure mode and configuration of beam of Portal Frame. The failure of beam trends to be controlled by the strength and the required bracing force increases when the stiffness of column increases. The required bracing force corresponding to the beam subjected to the ultimate load increases when the span of beam or the width of beam flange increases. The research work can be used as reference for the brace design for beam of Portal Frame.
Gong Junqing - One of the best experts on this subject based on the ideXlab platform.
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The integral stability analysis of the long-span tension-chord Portal Frame
Fourth International Conference on Advances in Steel Structures, 2005Co-Authors: Tang Kun, Liu Baodong, Gong JunqingAbstract:Publisher Summary The chapter discusses the integral stability analysis of a long-span tension-chord Portal Frame. A tension-chord Portal Frame is composed of some simple space structure units, such as upper beam, bottom chord cable, strut, etc. Each unit can make up for each other's shortcomings, so stresses are more reasonable, and therefore materials can be economized and longer span can be obtained. To design this kind of newly long-span space hybrid structure safely and economically, the stability performance of the structure should be studied. The tension-chord Portal Frame is an integrality that consists of cross-beam, strut, cable wire, etc. Once a structural member loses the stability and is out of shape, it must affect other structural members that connect to it. According to these analyses, the finite-element method is used to analyze the integral stability of a tension-chord Portal Frame in the chapter.
Ibrahim M. Mahdi - One of the best experts on this subject based on the ideXlab platform.
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Decision support system to select the optimum steel Portal Frame coverage system
Ain Shams Engineering Journal, 2020Co-Authors: Mohamed A. El-aghoury, Ahmed M. Ebid, Ibrahim M. MahdiAbstract:Abstract Portal Frame systems are widely used as coverage system in industrial projects. Selecting the proper Portal Frame system for a certain project depends on many technical, financial and logistical factors such as estimated cost, construction duration, availability of materials, equipment and skilled labor, besides environmental factors such as recycling and durability. The aim of this research is to create a Decision Support System (DSS) to decide the optimal Portal Frame system considering all these factors. The proposed (DSS) depends on integrating the Value Engineering (VE) concept with the Analytical Hierarchy Process (AHP) technique to identify the optimum system. The considered systems in this research are conventional Portal made of hot rolled section, pre-engineered built-up Portal Frame, trussed Frames and Portal Frame truss. The developed (DSS) was tuned for the current Egyptian market conditions in 2019 and successfully verified using four selected projects with different height to span ratio.
