不同设防烈度下RC框架结构的抗侧向倒塌能力
Lateral collapse-resistant capacity of reinforced concrete frame structures with different seismic fortification intensity

地震作用下建筑结构的抗侧向倒塌能力是抗震性能评价的基础。选取4个结构整体性能参数作为结构抗侧向倒塌能力评价指标，分别为结构强屈比、超强系数、延性系数和延展系数。按中国现行规范设计了12个RC框架结构，考虑侧向力分布形式和设防烈度的影响，采用Pushover方法对结构进行计算，并根据能力曲线和结构整体性能参数对结构抗侧向倒塌能力进行评价。结果表明：结构整体性能参数能从强度储备和变形能力两个方面对结构抗侧向倒塌能力进行分析；随着设防烈度和结构高度的提高，侧向力分布形式对结构抗侧向倒塌能力的影响增大；设防烈度对结构强屈比和结构延展系数的影响较小，对结构超强系数和结构延性系数的影响较大；随着设防烈度的提高，结构超强系数减小，而结构延性系数增大。
The lateral collapse-resistant capacity of the structure is the foundation of structure seismic performance assessment.Four seismic performance factors,namely,the yield ratio, the system overstrength factor, the ductility factor and the malleability factor, are used to evaluate lateral collapse-resistant capacity of 12 codified designed RC structures. The influences of the distribution of lateral loadings and seismic fortification intensity are considered in the Pushover analysis. Lateral collapse-resistant capacity of the structure is evaluated with capacity curve and seismic performance factors. The results show that lateral collapse-resistant capacity of the structure can be analyzed by seismic performance factors from two aspects, strength storage and deformability. The influence on lateral collapse-resistant capacity of the structure of lateral loadings increases with the rise of seismic fortification intensity and the height of structures. Seismic fortification intensity has little influence on the yield ratio and the malleability factor, but has major influence on the system overstrength factor and the ductility factor. With the increase of fortification intensity, the overstrength coefficient decreases and the ductility coefficient increases.