【摘要】 依据我国建筑抗震设计规范反应谱曲线,分析了隔震周期、隔震结构水平向减震系数和隔震层水平位移之间的关系,结果表明在软土地基上采用传统隔震技术很难控制罕遇地震作用下隔震层的较大水平变位。若隔震层水平变位的控制不当,罕遇地震作用下很容易导致隔震支座的失稳或强度破坏。针对这一问题,提出了包括铅芯橡胶支座隔震方案,铅芯橡胶支座、叠层橡胶支座和黏滞阻尼器组合隔震方案,以及滑板支座、普通橡胶支座和黏滞阻尼器组合隔震方案的三种不同隔震方案来解决软土场地上隔震效果和隔震层水平位移限值的问题,并且依据隔震方案提供不同大小的阻尼比来满足不同层次的隔震需求。最后结合隔震工程实例分析验证了软土地基隔震方案的可行性。更多还原

【Abstract】 According to the response spectrum curve of code for seismic design of buildings,the relationships among the isolation period,the horizontal seismic isolating coefficient and the displacement of isolation layer are discussed.The results show that the large horizontal displacement of isolation layer under rarely-occurred earthquake is difficult to keep within limit by using the traditional isolation technology in the soft ground. When the horizontal displacement of the isolation layer is not controlled in the allowable range for the isolation engineering,the instability or strength failure of the seismic isolators would occur probably under rarely-occurred earthquake. For this problem,three different seismic isolation schemes( including lead rubber bearing isolation scheme; combined isolation scheme of lead rubber bearing,laminated rubber bearing and viscous damper; combined isolation scheme of flat sliding bearing,rubber bearing and viscous damper) are proposed to solve the contradiction between seismic isolation effect and horizontal displacement of isolation layer in the soft ground,and different levels of isolation demand can be satisfied by using these seismic isolation schemes which can offer different damping ratios. In the end,combined with engineering cases of seismic isolation,the practicability of the seismic isolation schemes proposed in this paper is proved for the isolation design in the soft ground.更多还原