摘要
设计1个20层SRC框架核心筒结构模型,考虑地震的随机性和结构材料的不确定性,采用拉丁超立方体抽取结构-地震动样本,之后对其进行增量动力分析(IDA),以第1周期谱加速度为强度指标,最大层间位移角为结构需求,定义4个性能水平,研究该结构的易损性。通过引入群体结构震害评估中易损性指数的概念,计算多遇、设防和罕遇地震下的易损性指数。结果表明:以易损性指数作为评价指标,该结构在多遇地震作用下,处于轻微破坏状态;在设防地震作用下,处于中等破坏状态;在罕遇地震作用下,结构处于严重破坏状态。可认为依据我国抗震规范设计的SRC框架核心筒结构能够满足“小震不坏”、“中震可修”和“大震不倒”的抗震设防目标。
Considering the randomness of the ground motions and the uncertainty of the structural materials,the Latin hypercube sampling method was used to extract the structure-ground motion samples,and the incremental dynamic analysis(IDA)was carried out for a 20-story SRC frame-core wall structure.The first periodic spectral acceleration was used as the strength index,and the maximum interstory drift as the structural requirement index.Four performance levels were defined to study the earthquake vulnerability of the structure.The concept of vulnerability index for the seismic damage assessment of structures was introduced for this study,and the vulnerability indices for the frequent earthquake,fortification earthquake and rare earthquake were obtained.The results based on the vulnerability index show that the structure presented moderate damage under the frequently earthquake,medium damage under the designed fortification earthquake and serious damage under the rare earthquake.It can be concluded that the SRC frame-core wall structure designed according to the current codes can satisfy the seismic fortification targets of“no damage under frequent earthquake”,“no unrepairable damage under design-based earthquake”,and“no collapse under the rare earthquake”.
作者
盛金喜
李慧民
马海聘
SHENG Jinxi;LI Huimin;MA Haipin(School of Civil Engineering,Xi’an University of Architecture and Technology,Xian 710055,China)
出处
《世界地震工程》
CSCD
北大核心
2020年第1期101-108,共8页
World Earthquake Engineering
基金
住建部科技项目(2015-R3-003)
陕西省教育厅科技项目(15JK2054)
关键词
SRC框架核心筒结构
增量动力分析
性能水平
易损性指数
SRC frame-core wall structure
incremental dynamic analysis
performance level
vulnerability index
