多层预应力混凝土框架结构基于IDA的地震易损性分析

发布时间：2018-01-14 06:32

本文关键词：多层预应力混凝土框架结构基于IDA的地震易损性分析　出处：《工程力学》2017年06期 　论文类型：期刊论文

【摘要】：为研究我国《预应力混凝土结构抗震设计规程》(JGJ40-2004)所规定的PC框架结构轴压比、柱端弯矩增大系数等设计参数取值的合理性,根据该规程设计了6榀轴压比与柱端弯矩增大系数取值不同、抗震等级为二级的PC框架结构,在Open Sees软件中,采用基于材料的非线性纤维梁柱单元建立其数值分析模型,考虑材料、荷载、地震动等参数的随机性,分别对其进行基于增量动力的易损性分析。研究表明:当轴压比相同时,提高柱端弯矩增大系数,或在柱端弯矩增大系数相同时,减小柱的轴压比,均能有效地改善PC框架结构的抗震性能;04规程中规定的二级PC框架结构的柱端弯矩增大系数限值偏小,规程修订时应予以增大,建议≥2.0;04规程中规定的二级PC框架结构的轴压比限值偏大,规程修订时应予以适当减小,建议0.7。
[Abstract]:For the study of China's specification for design of prestressed concrete structure > > (JGJ40-2004) PC frame structure under the axial compression ratio, the rationality of moment augment factor of column design parameters, according to the design specification for 6 specimens of axial compression ratio of column end moment and increase coefficient of different seismic grade PC frame structure two the Open in the Sees software, using the nonlinear fiber beam column element to establish the numerical analysis model, based on the consideration of material, load, random vibration parameters, separately carried on the analysis of vulnerability based on incremental dynamic. Research shows that: when the axial compression ratio at the same time, improve the flexural strength at the end of column moment coefficient, or increasing coefficient is the same, cut down the column axial compression ratio, can effectively improve the seismic performance of PC frame structure; flexural strength coefficient of two level PC framework provisions of the 04 procedures in the limit of small. The process should be amended to increase, that is not less than 2; two level PC framework provisions of the 04 procedures in the limit value of axial compression ratio is too large, rules should be amended properly reduced, 0.7.

【作者单位】：华中科技大学土木工程与力学学院;
【基金】：国家自然科学基金项目(51278218)
【分类号】：TU378.4
【正文快照】： 预应力混凝土框架结构因具有截面刚度高、耐久性能和抗裂性能好、可满足现代建筑对大跨度、大柱网、大空间功能要求、综合经济效益好等优点,自20世纪80年代以来,在世界范围内得到了大量的推广和应用。众所周知,我国是一个多地震的国家,地震灾害频繁发生,已建或在建的预应力混

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