多维地震作用下地基不均匀沉降结构响应研究  

Study on the response of structures with uneven settlement of foundation under the action of multi-dimensional earthquake

作　　者：丁孟成 包超[1] 尚浩东 赵迎晨 马肖彤 DING Mengcheng;BAO Chao;SHANG Haodong;ZHAO Yingchen;MA Xiaotong(School of Civil and Hydraulic Engineering,Ningxia University,Yinchuan 750021,China;Ningxia No.2 Construction Co.,LTD,Yinchuan 750021,China;School of Civil Engineering,North Minzu University,Yinchuan 750021,China)

机构地区：[1]宁夏大学土木与水利工程学院,宁夏银川750021 [2]宁夏第二建筑有限公司,宁夏银川750021 [3]北方民族大学土木工程学院,宁夏银川750021

出　　处：《青海大学学报》2023年第5期83-92,共10页Journal of Qinghai University

基　　金：宁夏重点研发计划项目(2021BEG03022);中国科学院“西部之光”人才培养计划项目(XAB2021YW14);宁夏大学2022年产教融合研究生联合培养示范基地建设项目(SFJD202210);宁夏青年科技人才托举工程(TJGC2019007,TJGC2019001);宁夏回族自治区重点研发计划项目(引才专项)(2018BEB04006)。

摘　　要：为了研究在多维地震与地基不均匀沉降共同作用下RC框架结构地震损伤特征,采用数值模拟方法对比分析了在不同沉降区和沉降量条件下结构变形特征、能量耗散规律及破坏模式。结果表明:对于地基不均匀沉降的RC框架结构,多维地震作用与单向地震作用所引起的结构最大层间位移响应较为接近,但二者所引起的结构扭转效应差异显著,且不均匀沉降区域距离结构平面中心越远,扭转效应就越显著。地基不均匀沉降造成框架结构刚度退化,引起结构自振周期延长,对结构能量耗散模式产生显著影响,且不均匀沉降量越大,阻尼耗能占总耗能比例越小,累计滞回耗能占总耗能比例越大。地基不均匀沉降导致沉降区框架柱出现地震破坏相对滞后,破坏程度也有所减弱,但会造成与沉降区域相连的梁柱构件更早发生破坏,且破坏程度更为严重。In order to explore the seismic damage characteristics of RC frame structures under the combining action of multi-dimensional earthquake and uneven settlement of foundation,the deformation characteristics,energy dissipation rule and damage modes of RC frame structures are analyzed by numerical simulation under different settlement areas and conditions.The results indicate that in terms of RC frame structures with uneven settlement of foundation,the maximum interlayer displacement response caused by multi-dimensional seismic action and unidirectional seismic action is relatively close,while the difference in the structural torsion effect is significant.Moreover,the farther the uneven settlement area is from the center of the structure,the more significant the torsion effect is.The uneven settlement of foundation causes stiffness degradation of frame structure and prolongs the natural vibration period of the structure,which has a significant impact on the energy dissipation mode of the structure.The larger the uneven settlement,the smaller the proportion of damping energy consumption to total energy consumption,and the larger the proportion of hysteresis energy consumption to total energy consumption.The uneven settlement of foundation results in relatively delayed seismic damage to the frame columns in the settlement area,and the degree of damage is also weakened.However,it will cause earlier and more severe damage to the beam column components connected to the settlement area.

关 键 词：地基不均匀沉降 多维地震 框架结构 能量耗散 地震损伤 

分 类 号：TU313.3[建筑科学—结构工程]