摘要
为了研究地基不均匀沉降对基础隔震结构抗震性能的影响,对比分析发生沉降的的基础隔震结构和未发生沉降的隔震结构,从能量的角度入手,引入综合考虑变形和能量的双参数损伤模型对其上部结构进行损伤分析,并以楼层最大损伤指数为量化指标,对其上部结构进行了易损性分析。研究结果表明:不均匀沉降发生后,隔震支座位移变大;在地震动作用下,上部结构楼层损伤增加;发生沉降的基础隔震结构超越各级极限破坏状态的概率大于未沉降的隔震结构,更容易遭受地震破坏。
In order to study the influence of uneven settlement of foundation to seismic performance of base-isolated structure,the baseisolated structure and intact structure are contrasted and analyzed.From the point view of energy,two-parameter damage models considering deformation and energy are introduced to analyse superstructure damage,and the maximum floor damage index of superstructure is used as quantitative index to analyse superstructure vulnerability.The result of study shows that：once uneven settlement of foundation happens,the displacement of isolation becames larger;under the impact of earthquake,the floor damage of superstructure increases;the probability which beyonds all levels limited damage state of uneven settlement base-isolated structure is bigger than intact structure and much more easy to be damaged by the earthquake.
出处
《工程抗震与加固改造》
北大核心
2017年第6期79-86,55,共9页
Earthquake Resistant Engineering and Retrofitting
基金
国家自然科学基金资助项目(51578274)
关键词
不均匀沉降
损伤模型
基础隔震结构
易损性
uneven settlement
damage model
base-isolated structure
vulnerability
