上部结构质量偏心和刚度偏心对隔震层支座承载性能影响研究  

Study on the load-bearing performance of the seismic isolation layer bearing by the eccentricity of the superstructure quality and stiffness

作　　者：王有新 陶忠[1,2] 赵东龙 WANG Youxin;TAO Zhong;ZHAO Donglong(School of Architectural Engineering,Kunming University of Science and Technology,Kunming 650500,China;Yunnan Province Engineering Seismic Research Institute,Kunming 650500,China)

机构地区：[1]昆明理工大学建筑工程学院,云南昆明650500 [2]云南省工程抗震研究所,云南昆明650500

出　　处：《四川建筑科学研究》2023年第2期1-10,共10页Sichuan Building Science

基　　金：国家重点研发计划(2017YFC0707603);云南省科技厅重点专项(202003AC100001)。

摘　　要：在地震作用下上部结构质量偏心和刚度偏心会使结构产生扭转运动,进而对隔震层支座承载性能产生影响,隔震层支座的承载性能对于结构的安全和使用至关重要。所以,以7层钢筋混凝土框架结构为研究对象,基于有限元分析软件ETABS,研究了上部结构质量偏心和刚度偏心对隔震层支座承载性能的影响。通过对7组不同质量偏心率和7组不同刚度偏心率进行研究对比,得到了隔震层支座承载性能(水平位移、竖向压缩位移、短期极大面压和短期极小面压)的变化规律。结果表明:①对于支座水平位移,随着质量偏心率或刚度偏心率的增大,支座水平位移逐渐增大。支座群的最大位移点为结构质量偏心一侧的边支座,最小位移点为结构远离质量偏心一侧的边支座。质量偏心与刚度偏心对支座水平位移影响都较大。②对于支座群竖向压缩位移、短期极大面压,随着质量偏心率的增大,其从左往右先减小后增大。刚度偏心率的影响很小,最大、最小竖向压缩位移和短期极大面压均出现在4个角支座。③对于支座短期极小面压,随着质量偏心率的增大,支座群整体趋势从左到右先减小后增大再减小。刚度偏心对支座的短期极小面压影响不大。The mass eccentricity and stiffness eccentricity of the superstructure will cause the structure to torsional motion under the action of the earthquake.In turn,it has an impact on the bearing performance of the seismic isolation layer bearing.The load-bearing performance of the seismic isolation layer bearing is critical to the safety and use of the structure.Therefore,taking the seven-layer reinforced concrete frame structure as the research object,based on finite element analysis software ETABS,the effect of mass eccentricity and stiffness eccentricity of superstructure on the bearing performance of seismic isolation layer bearing was studied.Through the study and comparison of 7 groups of different mass eccentricity and 7 groups of different stiffness eccentricity,the variation law of bearing performance(horizontal displacement,vertical compression displacement,short-term maximum surface pressure and short-term minimal surface pressure)of the seismic isolation layer bearing was obtained.The results show that:①The horizontal displacement of the bearing gradually increases as the mass eccentricity or stiffness eccentricity increases.The maximum displacement point of the bearing group is the side bearing on the eccentric side of the structural mass,and the smallest displacement point is the side bearing on the eccentric side of the structure away from the mass eccentric side.Mass eccentricity and stiffness eccentricity have a great influence on the horizontal displacement of the bearing.②For the vertical compression displacement of the bearing group and the short-term maximum surface pressure,with the increase of the mass eccentricity,they are reduced from left to right and then increased.The effect of stiffness eccentricity is small,and the maximum and minimum vertical compression displacements and short-term maximum surface pressures appear in the four angular bearings.③For the short-term minimal surface pressure of the bearing,with the increase of the mass eccentricity,the overall trend of the bearing gro

关 键 词：质量偏心 刚度偏心 隔震层支座承载性能 有限元 ETABS 

分 类 号：TU398.2[建筑科学—结构工程]