主余震序列作用下村镇砌体结构破坏机理与抗震性能评估及设计方法研究

一次强震过后通常伴随有多次余震的发生，主余震序列作用下结构的震害也往往比单独主震作用时更为严重。我国村镇砌体结构历史震害严重，但主余震序列作用下村镇砌体结构的破坏机理与抗震性能评估及设计方法等方面的研究却非常缺乏。. 本项目以江西村镇典型砖砌体结构为依托，通过理论、试验和数值模拟相结合的方式对主余震序列作用下村镇砌体结构抗震涉及的关键问题开展研究。主要内容包括：1）基于振动台试验和有限元分析，系统研究主余震序列作用下村镇砌体结构的抗震性能，揭示结构损伤累积规律及破坏机理；2）提出考虑主余震序列作用的村镇砌体结构抗震性能评估方法，建立高效可靠的抗震性能评估模型，给出考虑多影响因素的余震震害预测方法；3）提出主余震序列作用下村镇砌体结构抗震设计方法，建立考虑多影响因素的结构损伤指数计算模型，明确量化设计指标。本项目成果可为我国村镇砌体结构的抗震设计、加固改造和性能评估提供参考。

The seismic damage of the structure under the mainshock-aftershock seismic sequences is usually more serious than that of the mainshock alone, because many aftershocks happened after a strong earthquake. Though the historical seismic damage of rural masonry structure is serious in China, the study on the failure mechanism, methods of seismic performance evaluation and design of rural masonry structure under mainshock-aftershock seismic sequence is very deficient.. This project, based on the typical rural brick masonry structure in Jiangxi, aims to study the key problems of seismic resistance of rural masonry structure under mainshock-aftershock seismic sequences by using theories, experiments and numerical simulations methods. The main contents are as follows: (1) study on the seismic behavior of rural masonry structure systematically under mainshock-aftershock seismic sequences and reveal the cumulative law and mechanism of seismic damage based on the shaking table tests and finite element analysis. (2) present the seismic performance evaluation methods considering the effect of the mainshock-aftershock seismic sequences, set up efficient and reliable models for seismic performance evaluation and propose the seismic damage prediction methods under aftershock considering multiple factors. (3) present the seismic design methods for rural masonry structure under mainshock-aftershock seismic sequences, establish damage index calculation models considering multiple factors and determine the relevant quantitative design indexes. The results of this project can provide references for seismic design, strengthening and performance evaluation of rural masonry structures in China.