摘要
为量化近场速度脉冲型地震动对网壳-支承结构地震响应的放大效应,以典型的双层柱面钢网壳-钢筋混凝土框架支承结构为研究对象,以一组20条含有速度脉冲的近场地震动及另一组与之对应的20条剔除速度脉冲成分的残余地震动作为输入,分别对其进行IDA分析,并对下部支承结构和上部网壳结构的地震响应进行统计分析。结果表明:近场速度脉冲型地震动对双层柱面钢网壳-钢筋混凝土框架支承结构的节点位移、层间位移角、构件轴力和构件屈服比例等响应均具有显著的放大效应;具体而言,不同强度的地震动作用时,对于下部支承结构,最大节点位移的放大系数平均值约为1.6~2.1,最大层间位移角的放大系数平均值约为1.6~2.0,最大构件轴力的放大系数平均值约为1.0~1.6,最大基底反力的放大系数平均值约为1.1~1.5;对于上部网壳结构,最大节点位移的放大系数平均值约为1.6~2.0,最大杆件轴力的放大系数平均值约为1.2~1.6,上下部结构连接处最大支反力的放大系数平均值约为0.8~1.1。文中结论可为近场高烈度地震区双层柱面钢网壳-钢筋混凝土框架支承结构的抗震设计提供技术依据。
In order to quantify the amplification effects of near-fault velocity pulse-like ground motions on seismic responses of reticulated shell-supporting structures,a representative double-layer cylindrical steel reticulated shellreinforced concrete frame supporting structure was designed and used for the analyses.A group of 20 near-fault ground motions each of which contains velocity pulse and the other group of 20 corresponding residual ground motions with removing velocity pulse component were used as seismic input for IDAs.Then,statistical analyses on the seismic responses of the lower supporting structure and the upper reticulated shell structure were respectively conducted.The results show that,for the double-layer cylindrical steel reticulated shell-reinforced concrete frame supporting structure,the near-fault velocity pulse-like ground motions have significant amplification effects on the nodal displacements,inter-story drift ratios,axial forces of members and yield ratios of members;Specifically,for the lower supporting structure under seismic excitations of different intensities,the mean values of the amplification factors for the maximum nodal displacements is about 1.6~2.1,for the maximum inter-story drift ratios is about 1.6~2.0,for the maximum axial forces of members is about 1.0~1.6,and for the maximum base reaction forces is about 1.1~1.5.Likewise,for the upper reticulated shell structure,the mean values of the amplification factors for the maximum nodal displacements is about 1.6~2.0,for the maximum axial forces of members is about 1.2~1.6,and for the maximum reaction forces at the connections between upper and lower structure is about 0.8~1.1.The conclusions in this paper can provide technical guidance for the seismic design of the double-layer cylindrical steel reticulated shell-reinforced concrete frame supporting structures built in the near-fault high seismic intensity zones.
作者
吴国盐
钟杰
聂桂波
王健泽
戴靠山
蒋玉川
WU Guoyan;ZHONG Jie;NIE Guibo;WANG Jianze;DAI Kaoshan;JIANG Yuchuan(College of Architecture&Environment,Sichuan University,Chengdu 610065,China;Key Laboratory of Deep Underground Science and Engineering of the Ministry of Education,Sichuan University,Chengdu 610065,China;Key Laboratory of Earthquake Engineering and Engineering Vibration,Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150080,China)
出处
《地震工程与工程振动》
CSCD
北大核心
2022年第3期216-225,共10页
Earthquake Engineering and Engineering Dynamics
基金
国家自然科学基金项目(52008274)
中国地震局工程力学研究所基本科研业务费专项资助项目(2021D23)
中央高校基本科研业务费专项资金项目(YJ202031)。
关键词
网壳结构
近场地震
速度脉冲
地震响应
放大系数
reticulated shell structures
near-fault earthquakes
velocity pulses
seismic responses
amplification factors
