论文部分内容阅读
将土体－框架结构简化为二维问题，地基土视为粘弹性材料，框架结构简化为平面杆系非弹性结构。以一幢实际的六层二跨框架结构为研究对象，探讨了ＴＭＤ（调谐质量阻尼器）的减震特性及土－结构相互作用（ＳＳＩ）效应对ＴＭＤ减震效果的影响。在一般地基条件下，ＳＳＩ效应显著降低多层框架结构在地震时的层间位移反应，降低幅度达１０％～５０％。当ＴＭＤ的振动周期与被控制（土体与）结构体系的基本周期一致时，ＴＭＤ才能发挥最佳的减震效果；否则，ＴＭＤ的减震效果将有不同程度的降低，幅度可达５％～１０％。在软土地基条件下ＴＭＤ的减震效果很差。若抗震设计时顾及客观存在的ＳＳＩ效应的影响，则按刚性地基假定下设置的ＴＭＤ设施有时可能是不必要的。
The soil-frame structure is simplified into a two-dimensional problem. The foundation soil is regarded as a viscoelastic material, and the frame structure is simplified as a non-elastic structure of a plane beam system. Taking a practical six-story and two-span frame structure as the research object, the shock absorption characteristics and soil-structure interaction (SSI) effect of TMD (tuned mass damper) on the shock absorption effect of TMD are discussed. Under general ground conditions, the SSI effect significantly reduces the interlaminar displacement response of multi-story frame structures during earthquakes, reducing the amplitude by 10% to 50%. When the TMD vibration cycle is consistent with the basic cycle of the system being controlled (soil and body), TMD can play the best damping effect; otherwise, the damping effect of TMD will be reduced to varying degrees, the amplitude can reach 5% ~10%. The damping effect of TMD is poor under soft soil conditions. If the impact of the objectively existing SSI effect is taken into account in the seismic design, the TMD facility set under the rigid ground assumption may not be necessary at times.