Reliability assessment of assembled shear wall structures considering stochastic defects in sleeve grouting
薛亮 1孙千伟 2任晓丹 1秦夏强 2许海岩2
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作者信息
1. 同济大学 土木工程学院,上海 200092
2. 中国二十冶集团有限公司,上海 201999
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摘要
在装配整体式剪力墙结构中,由于套筒灌浆连接的质量具有一定的随机性,势必影响结构的竖向连接性能和结构抗震性能.根据不同缺陷程度的套筒灌浆拉拔试验,建立了一套等效套筒灌浆缺陷连接承载力模型,并基于某实际工程结构,建立了装配整体式剪力墙结构有限元模型.通过考虑灌浆缺陷的随机性,赋予连接接头相应缺陷程度的力学连接性能,来反映套筒灌浆中可能存在的缺陷.通过非线性有限元分析并结合概率密度演化方法(probability density evolution method,PDEM)进行了结构随机非线性反应分析和可靠度评估.结果表明:在动力作用下,结构非线性与随机性具有明显的耦合效应;缺陷的随机性会随着时间的推移,逐渐放大对结构响应的影响;在不同的安全域内,结构的整体可靠度将存在较大的差异.
Abstract
In assembled integral shear wall structures,the quality of sleeve grouting connections is random,that the vertical connection performance of structure and the seismic performance of structure will be affected.According to the pull-out tests of grouting sleeves with different defective degrees,a set of equivalent grouting sleeve defective connection bearing capacity models is established in this paper,and a finite element model of the assembled integral shear wall structure is built based on an actual engineering structure.By considering the randomness of grouting defects,the mechanical connection properties of grouting sleeve joints are given to the corresponding degree of defects,reflecting possible defects in the grouting sleeve.Structural stochastic non-linear response analysis and reliability assessment were carried out by non-linear finite element analysis and combined with probability density evolution method(PDEM).The results show that the structural non-linearity has a significant coupling effect with randomness under dynamic action.The randomness of defects will gradually amplify the effect on the structural response over time,and there will be significant differences in the overall reliability of the structure in different safety domains.
关键词
装配式剪力墙结构/套筒灌浆连接缺陷/随机反应分析/可靠度计算/概率密度演化方法
Key words
assembled shear wall structures/defects of grouting sleeve/random response analysis/reliability calculation/probability density evolution method(PDEM)
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