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Research on Performance - Based Seismic Design of Frame Structure with Fiber Model Multiplying Reduction Factor of Natural Period of Vibration

Author: XiongAiGuo
Tutor: JiJing
School: South China University of Technology
Course: Disaster Prevention and Reduction Engineering and Protective Engineering
Keywords: frame structure fiber model shaking table test pushover test finite element performance-based seismic design method elastic-plastic time history analysis
CLC: TU352.11
Type: Master's thesis
Year: 2011
Downloads: 136
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Abstract

Based on the current structure design codes, considering the“additional rigidity of structure”effect of infill wall, the engineers usually take the first stage design method to seismic elastic analysis. The above procedure is as: based on natural period of vibration of frame structure multiplying reduction factor, the CQC response spectrum analysis is applied to calculate the seismic internal force under frequent earthquake, which is used to load case combination of calculating the longitudinal reinforcement ratio of components of the whole structure. Beside, the acceleration of seismic waves, which are used to elastic and elastic-plastic time history analysis of the whole structure, are modified in compliance with the maximum acceleration of current seismic code. It shows that during the second seismic design stage, deformation and bearing capacity of components of the frame structure is respectively checked without considering the“additional rigidity of structure”effect of infill wall. So the frame structure is generally designed, considering the rigidity of structure that is smaller the real rigidity of structure, the earthquake action that is smaller the real earthquake action, which leads to the frame structure in dangerous state.According to <Code for seismic design of buildings> (GB 5001-2010), performance objectives levels classification and performance objectives levels are put forward. But according to two performance index of story drifts and bearing capacity of components, at the present performance levels of components, which is used to estimate the performance levels classification of structure, are defined by new seismic code. It obviously shows that seismic part of performance characteristic of the whole structure and components is only reflected.According to the above phenomenon, the main research contents in this paper are as follows:1) The fiber model theory of finite element simulation analysis is presented. Based on the comparison of plastic hinge model, practicability of fiber model analysis and engineering application of Perform-3D that is the software of nonlinear analysis and performance assessment for three-dimensional structure with the fiber model is respectively summed up in this paper.2) Based on the fiber model, Perform-3D, which is the finite element software of nonlinear analysis and performance assessment for three-dimensional, is respectively used to simulate a three-story steel reinforced concrete frame plane model of shaking table test carried out in XI`AN UNIVERSITY OF SCIENCE AND TECHNOLOGY and a three-story one-bay reinforced concrete frame model of existing building pushover test carried out in TONGJI UNIVERSITY. In addition, when the structure is in elastic and elastic-plastic stage, the result of test is respectively used to compare with the result of finite element simulation. Based on the above comparison result, it obviously shows that the“additional rigidity of structure”effect of infill wall should be taken into account for frame structure and confirms that the result of finite element simulation is confident.3) Based on taking performance-based seismic design codes such as FEMA-356 and ASCE-41 as a reference, the theory of performance-based seismic design is presented. The domestic and overseas related research and engineering application of PBSD for frame structure is respectively summed up in this paper.4) Based on designing a frame structure case in compliance with seismic code, a modified factor method, which ensures that the frame structural system could take the“additional rigidity of structure”effect of infill wall into account during the second seismic design stage, leads to the whole structure in safe state.5) Based on taking performance-based seismic design codes such as FEMA-356 and ASCE-41 as a reference, some new performance index of components and materials is defined according to the current structure design codes, components of test, the results of finite element simulation and related knowledge.6) Based on Perform-3D platform of finite element simulation and analysis with fiber model, one typical case of frame structure, of which natural periods of vibration is multiplied reduction factor, with embedding modified factor method and performance index which the above charters have demonstrated, is studied and designed by PBSD in this paper. In addition, in order to meet the performance objectives, some measures which ensure the structure enough seismic bearing capacity and deformability are taken to the original model complied with seismic code. At last, characteristic of seismic performance of structural model in compliance with performance objectives is respectively estimated. According to two performance index of story drifts and bearing capacity of components, structural model, which belongs to performance objectives levels classification of 4, is checked by new seismic code.

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CLC: > Industrial Technology > Building Science > Building structure > Special Structure > Anti - shock structure,disaster prevention structures > Shock, isolation, and explosion-proof structure > Seismic structure
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