RC框架结构抗地震倒塌性能评估的简化方法

A SIMPLIFIED METHOD FOR COLLAPSE-RESISTANT PERFORMANCE EVALUATION OF RC FRAME STRUCTURES

框架结构抗地震倒塌性能的定量评估近年来受到广泛关注,迫切需要建立一套抗倒塌性能评估指标,而且需同时具备实用性和可行性。该文从我国抗震规范的延性设计要求出发,分别考虑柱、梁抗弯承载力比和柱弯曲屈服对应的剪力与柱受剪承载力比等参数对结构抗倒塌性能的影响,并分析了二者对结构抗倒塌性能影响的相关性。结果表明:柱、梁抗弯承载力比对结构抗倒塌性能影响显著,柱弯曲屈服对应的剪力与柱受剪承载力比对结构抗倒塌性能也有一定的影响,且二者对结构抗倒塌性能的影响存在相关性。通过对这两个结构参数进行不同的调整组合,考察结构的抗倒塌性能,进一步建立了简化的抗倒塌性能评估指标,为框架结构抗倒塌性能的定量评估提供参考。

Quantitative evaluation of collapse-resistant performance of structures has attracted widespread attention in the past few years, urging a set of evaluation indexes with practicality and feasibility to be proposed. In this study, based on the requirement for ductility design in national codes for seismic design of buildings in China, the influence of the ratio of column-to-beam moment strength on the collapse-resistant performance of structure was considered. The effect of the ratio of column plastic shear demand-to-shear capacity was also taken into account. In addition, the correlation of the impact caused by the above two structural parameters on the collapse-resistant performance of structures was analyzed. The results indicate that the ratio of column-to-beam moment strength has a significant impact on the collapse-resistant performance of the structure, and so does the ratio of column plastic shear demand-to-shear capacity. The above two structural parameters also exhibit a strong correlation with collapse performance evaluation. At the same time, by adjusting and combining the above two structural parameters, the collapse-resistant performance of structures was investigated, and a simplified evaluation index of the collapse-resistant performance was established, offering a reference to the quantitative evaluation of collapse-resistant performance of structures.