摘要
为了能够合理地评价城市轨道交通地下结构在地震下的损伤程度,给出了其抗震性能指标体系,包括构件的强度指标和结构的整体变形指标。构件的强度指标分为两个等级,并给出了其限值。结构的整体变形指标区分矩形截面和圆形截面,分别用层间位移角和最大直径变形率表示。通过分析地面建筑和地下建筑的异同,并统计了国内46组钢管混凝土框架和145组型钢混凝土框架的层间位移角的试验数据,得出了城市轨道交通矩形地下结构的层间位移角的不同性能下的限值。利用盾构隧道衬砌直径变形和内力的关系,通过变形协调推得直径变形率的计算公式;又通过动力增量法,分不同的场地和不同的地震波,计算得出典型盾构隧道的直径变形率,综合考虑后得出地震作用下盾构隧道直径变形率限值。
The seismic performance index system of urban mass transit underground structures is presented,which includes both intensity index of component and overall deformation index,in order to reasonably evaluate its damage degree under seismic excitations. Intensity index of component has two grades and limiting value of two grades are provided. Overall deformation index includes story drift angle for rectangular underground structures and diameter deformation rate for shield tunnels. Performance index values of urban mass transit rectangular underground structure story drift angle are put forward by reference to modified performance index values of ground structure story drift angle,which was based on a statistical analysis for experiment data of forty-six groups concrete-filled steel tubular frames and one hundred forty-five groups steel-reinforced concrete frames and took into account similarities and differences between surface structures and underground structures. Based on relation between tunnel diameter deformation and stress state of tunnel concrete and bolts,the diameter deformation rate was derived from the analytical solution using compatibility of deformation for a segment cross section. And the diameter deformation rate was also computed by means of incremental dynamic analysis method for different sites under various earthquakes. It is found in the study that based on two performance levels,limiting value of diameter deformation rate is obtained.
出处
《地震工程与工程振动》
CSCD
北大核心
2014年第S1期699-705,共7页
Earthquake Engineering and Engineering Dynamics
基金
住房和城乡建设部科技项目(NO.2008-k3-1)
河南省教育厅科学技术研究重点项目(14B560031)
河南大学科研基金项目(2013YBZR002)
关键词
城市轨道交通结构
性能指标
直径变形率
层间位移角
地下结构
urban mass transit structure
performance index
diameter deformation rate
story drift angle
under-ground structure
