RC框剪结构强震作用下破坏模式合理性评价方法研究

Study on rational evaluation method for failure mode of RC frame-shear wall structure under strong earthquakes

结构破坏模式的合理性评价方法是抗震防灾决策的重要依据,现有的评价方法往往侧重于结构的安全性或者经济性的某一方面对破坏模式进行评价,且目前综合考虑RC框剪结构安全性和经济性的定量评价方法没有出现。在总结以往研究者的安全性指标和经济性指标的基础上,结合建筑抗震设防类别、地震动、建筑使用功能等因素,提出RC框剪结构按权重分配考量安全性和经济性的破坏模式综合评价方法,并在现有的统计资料的基础上确定方法中的参数取值;同时,基于不同刚度特征值的四个框剪结构模型对综合评价方法进行验证。分析结果表明:提出的考虑安全性与经济性的RC框剪结构综合评价方法与单一考虑安全性或经济性的评价方法相比具有更好的区分性、实用性、适用性,合理可行,为确定RC框剪结构的合理破坏模式做了必要的准备。

The rationality evaluation method of structural failure modes is an important basis for decision-making of earthquake resistance and disaster prevention.The existing evaluation methods often focus on one aspect of structural safety or economy to evaluate the failure modes.At present,the quantitative evaluation method considering the safety and economy of RC frame-shear wall structures has not appeared.On the basis of summing up the safety and economic indexes of previous researchers,a comprehensive evaluation method of failure mode for RC frame-shear wall structure considering safety and economy according to weight distribution was proposed combined with the factors such as the building seismic fortification category,earthquake motion,building use function and so on.The parameters of the method were determined on the basis of existing statistical data;at the same time,four frame-shear wall structure models with different stiffness eigenvalues were used to validate the comprehensive evaluation method.The analysis results show that the comprehensive evaluation method of RC frame-shear wall structure considering safety and economy has better distinguishability,practicability,applicability and feasibility compared with the single evaluation method considering safety or economy,which makes necessary preparations for determining the reasonable failure mode of RC frame-shear wall structure.