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Design Method Analysis of the Load-Bearing Capacity and the Ductility of Special-Shaped R.C. Columns

Author: CaoZhiHui
Tutor: XuHaiYan
School: East China Jiaotong University
Course: Structural Engineering
Keywords: Shaped columns Internal force combination Ultimate bearing capacity Envelope diagram Finite Element Analysis Ductility Concept of ductility design Size bias destruction Axial compression ratio limit
CLC: TU311
Type: Master's thesis
Year: 2004
Downloads: 173
Quote: 2
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Abstract

In this paper, the deficiencies in the design and analysis of shaped columns, mainly from two aspects of the profiled the column normal section bearing capacity and ductility for in-depth analysis of research, analysis of the theoretical roots of the problem, and finally solve the problem. Proposed shaped columns are considering the cross-sectional design and ductility design a complete shaped pillar design methods. Including: 1, proposes a design method based on the ultimate bearing capacity envelope shaped columns first discuss the current profiled column section bearing capacity analysis, two questions: 1), due to the differences shaped columns and rectangular columns most unfavorable stress state, the traditional combination of internal forces control the internal forces may not be able to envelope lived components, safety issues; 2) shaped columns design calculation speed. On this basis, starting from the ultimate bearing capacity envelope diagram of a shaped columns are cross-sectional design. A good solution to the problem of security and computing speed, and methods from the theory and procedures to achieve this. 2, experiments and numerical example of the method of preparation of the corresponding design program. And discussion from the following aspects: 1) The experimental results were compared to verify the accuracy of this method, rationality; 2), the control of the traditional method of internal force combination of design shaped columns, and this paper consider ; 3), test different cross-sectional shape of the shaped columns example, step to verify the feasibility of the proposed method, practical; 4), the proposed method calculation method of calculation speed comparing with other shaped columns, highlight the usefulness of this method. Instance to validate the design method in reliability and speed are able to achieve good results, the true sense of the envelope design, the profiled column component design safer and more reasonable. Shaped column structure member and the single-component analysis of ductility differences comparing first theoretically finite element analysis model to analyze the constitutive relationship of concrete and steel, failure criteria and cracking processing, and so on, and by a numerical example, analysis of the calculation results are reflected in the law can be used to explain the law of the actual Z-shaped column member. And then using the finite element simulation method to discuss the member with a single member in the special-shaped column structure analysis of delay difference, only a cursory analysis of the L-shaped column ductility differences. 4, the axial compression ratio limits discussed and shaped columns ductility design of this chapter discuss shaped columns axial compression ratio limits and the main factors of the influence of special-shaped column ductility, and analyze shaped columns ductility design, only axial compression ratio for improve ductility limitations. On this basis, this chapter the traditional shaped columns ductility design ideas, directly from the ductility shaped columns concept design, the conditions allow

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