漩口中学典型框架结构震害模拟与分析

SEISMIC DAMAGE SIMULATION AND ANALYSIS OF TYPICAL RC FRAMES OF XUANKOU SCHOOL

该文以汶川地震震中附近的漩口中学教学楼和办公楼框架结构震害为背景,对其进行了模拟分析。针对震害特征,提出了微观-宏观多尺度有限元分析模型,以更准确的模拟结构的实际震害。在此基础上,为提高计算分析效率,结合微观-宏观多尺度有限元分析模型,提出能考虑楼板影响和基础转动的改进宏观有限元分析模型。采用多尺度模型和改进的宏观模型,用弹塑性动力时程分析模拟了漩口中学教学楼和办公楼框架结构的倒塌过程,对其倒塌模式、倒塌机理及其影响因素进行了分析比较,找出了影响结构抗倒塌能力的关键部位,为改进框架结构抗震倒塌能力设计提供了参考。

The seismic damage of typical reinforced concrete（RC） frames based on the classroom buildings and office buildings of the Xuankou School,which are close to the epicenter of Wenchuan Earthquake,is simulated and analyzed.According to the seismic damage characters,a micro-macro multi-scale finite element（FE） model is proposed to accurately simulate the seismic damage of the structures.Based on the multi-scale FE model,an improved macro FE model considering the influence of slabs and footing rotations is proposed to improve the computational efficiency.With the micro-macro multi-scale FE model and the improved macro FE model,the collapse process of classroom buildings and office buildings is simulated with elastic-plastic time-history analysis.By comparing the collapse modes and failure mechanisms of the structures,critical positions that influence seismic collapse resistance of a structure are found,which could be used for a reference for the improvement of seismic collapse prevention design of RC frame structures.