摘要
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。
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 analyzed 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 show that by controlling the axial compression ratio,the seismic collapse resistance is obviously improved.
出处
《工程抗震与加固改造》
北大核心
2010年第5期26-35,共10页
Earthquake Resistant Engineering and Retrofitting
基金
国家科技支撑计划项目(2009BAJ28B01)
国家自然科学基金重点项目(90815025)
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
frame structure
collapse performance
incremental dynamic analysis
collapse probability
axial compression ratio
