直接基于位移的PPC框架性能水准量化及设计位移可靠度分析

发布时间：2018-11-25 14:50

【摘要】：在按照我国现行规范设计的16榀PPC框架的Pushover抗震性能分析的基础上,对PPC框架性能水准的量化指标及DDBD法中设计位移的可靠度问题进行了研究。提出了结构基本完好、生命安全和防止倒塌三个性能水准的划分定义和以裂缝宽度、承载力指标等作为各性能水准的量化参考指标,并以量化参考指标对应的层间位移角作为其最终的量化指标。同时,将量化指标层间位移角做为抗力,预期风险水平地震下层间位移角反应作为效应,提出了一种以我国现行规范隐含的各性能水准可靠度为基础的考虑可靠度问题的简化方法。在某一性能水准下,DDBD法最终计算所得可靠度值β可视为一个与现行规范隐含可靠度值相对大小的量,极大避免了计算用变异系数取值差异带来的误差,且能满足同一性能水准的不同设计要求。
[Abstract]:Based on the analysis of the seismic performance of 16 PPC frames designed according to the existing codes in China, the quantitative index of the performance level of the PPC frame and the reliability of the design displacement in the DDBD method are studied. In this paper, the definition of three performance levels of basic integrity, safety of life and prevention of collapse is proposed, and the crack width and bearing capacity index are taken as the quantitative reference indexes of each performance level. The interstory displacement angle corresponding to the quantization reference index is taken as the final quantization index. At the same time, the quantitative index interstory displacement angle is taken as the resistance, and the displacement angle response between the lower layers of the expected risk level is taken as the effect. This paper presents a simplified method to consider the reliability problem based on the reliability of each performance level implied in the current code of our country. At a certain performance level, the final calculated reliability value 尾 by DDBD method can be regarded as a relative magnitude of the implicit reliability value of the current specification, which greatly avoids the error caused by the difference in the value of the coefficient of variation in the calculation. And can meet the same performance level of different design requirements.
【作者单位】：重庆大学土木工程学院;江苏省电力设计院;
【基金】：重庆市科委攻关项目(CSTC,2011AC4067) 重庆市建设科技计划项目(城科字2009第70号)
【分类号】：TU31;TU378

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