第十二届高层建设抗震技术交流会论文集.pdfVIP

第十二届高层建筑抗震技术交流会论文集, 2009. 10, 北京: 35-45. 柱轴压比对我国RC 框架结构抗地震倒塌能力的影响1 唐代远 陆新征 叶列平 施炜 清华大学土木工程系，清华大学结构工程与振动教育部重点实验室，北京，100084 摘要：本文首先用纤维模型和美国ATC-63 委员会推荐的IDA 方法，对按照我国现行抗震规 范设计的24 个钢筋混凝土框架结构（7 度设防，跨度、层高、层数不同）的抗地震倒塌能 力进行了分析，发现框架柱轴压比是影响框架结构抗地震倒塌能力的最主要因素，轴压比和 结构的倒塌储备系数CMR 具有一定的线性负相关关系，现行规范轴压比限值偏高是导致框 架结构抗地震倒塌能力不足的主要原因。通过改变框架柱截面尺寸调整轴压比后的进一步分 析表明，控制轴压比可有效改善框架结构的抗地震倒塌能力。 关键词：框架结构；抗倒塌能力；增量动力分析；倒塌概率；轴压比 中图分类号： 文献标识码： Influence of Axial Compression Ratio to the Seismic Collapse Resistance of RC Frame Structures Tang Dai-yuan, Lu Xin-zheng, Ye Lie-ping, Shi Wei Department of Civil Engineering, Tsinghua University, Key Laboratory of Structural Engineering and Vibration of China Education Ministry, Beijing 100084 The seismic collapse resistances of 24 reinforced concrete (RC) frame structures (in 7-degree seismic intensity zone, with different span, storey height and storey number) which are designed according to the Chinese Seismic Design Code are analysis with fiber-beam element model and incremental dynamic analysis (IDA) that is recommended by ATC-63 Report. The results show that the axial compression ratio of columns is the most important factor affecting seismic collapse resistance of these structures and there is a negative linear correlation between axial compression ratio of columns and collapse margin ratio of structures. The upper limit of current seismic design code is too big which mostly results in the lack of collapse resistance of frame structures. Then, the axial compression ratio of all structures is unified by adjusting their column size and the modified structures are analyzed again, which shows that by controlling the axial compression ratio, the seismic collapse resistance is obviously improved. Keywords: frame structure