摘要
地震易损性分析通过概率计算建立地震强度和结构损伤之间的关系,可以实现结构地震风险预测和评估。为了对框支密肋复合墙结构在不同地震强度下的抗震能力进行评估,该文采用OpenSEES有限元软件,选用密肋复合墙的刚架-等效斜撑简化模型,建立结构整体分析模型,基于增量动力时程分析(IDA)和易损性分析,研究不同参数的变化对结构抗震性能的影响。结果表明:转换层刚度比的变化对结构性能影响显著,结构竖向布置均匀对抗震有利,建议8度区框支密肋复合墙结构的刚度比取值为1.0~2.5;肋柱数量、砌块强度的变化可对结构的抗震性能产生影响,应合理选择;混凝土强度等级对结构的抗震性能影响较大,在实际应用中应在满足规范要求的前提下选择较大的混凝土强度等级。
Seismic fragility analysis can be used to predict and assess the seismic risk of structures by quantitatively establishing the relationship between seismic intensity and structural damage.This paper aims to evaluate the seismic capacity of frame-supported multi-ribbed composite wall structure under different seismic intensities.Models of the whole building are constructed in OpenSEES,which use the simplified frame-equivalent diagonal brace model of multi-ribbed composite wall,and the influence of different parameters on the seismic performance of the structure is studied based on the Incremental Dynamic Analysis(IDA)and fragility analysis.The results show that the change of the stiffness ratio of the transfer floor has significant impact on the structural performance.Uniform arrangement of the structure along the vertical direction can improve the seismic resistance.It is suggested that:the stiffness ratio of the frame structures with multi-ribbed composite wall in areas with an seismic intensity of 8 should be 1.0-2.5;the number of ribbed columns and block strength can affect the seismic performance of the structure,which should be reasonably selected;and the concrete strength has significant effect on the seismic performance of the structure,and concrete with higher grade should be adopted in practice while the code requirements should be satisfied.
作者
孙静
吴君怡
卢啸
SUN Jing;WU Jun-yi;LU Xiao(School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China;China Design Group Co.,Ltd.,Nanjing,Jiangsu 210014,China)
出处
《工程力学》
EI
CSCD
北大核心
2023年第6期61-72,共12页
Engineering Mechanics
基金
国家自然科学基金面上项目(52078037)。
关键词
框支密肋复合墙结构
地震易损性
刚架-等效斜撑
增量动力分析
转换层刚度比
frame-supported multi-ribbed composite wall structure
seismic fragility analysis
frame-equivalent diagonal brace model
incremental dynamic analysis
stiffness ratio of the transfer-floor
