楼板隔震TMD结构减隔震性能的分析

Analysis of the Seismic Isolation and Energy Dissipation Performance of Floor Slab Isolated TMD Structures

摘要: 本文以一栋10层钢筋混凝土框架结构商业办公综合楼为例，研究了楼板隔震调谐质量阻尼器(TMD)结构的减震性能。利用SAP2000软件建立了抗震结构与六种不同布置形式的楼板隔震TMD结构有限元模型。通过选取7条地震波(5条天然波和2条人工波)进行罕遇地震下的弹塑性时程分析，对比了不同方案在基底剪力、层间剪力、层间位移及顶层位移等方面的响应。研究结论表明，楼板隔震TMD结构能有效延长结构自振周期，显著降低基底剪力(20%~40%)以及层间剪力和位移(30%~70%)，验证了该体系在强震下的减隔震效果。

Abstract: This paper investigates the seismic mitigation performance of floor-isolated tuned mass damper (TMD) structures, taking a 10-story reinforced concrete frame commercial-office complex as the case study. Finite element models of the conventional seismic-resistant structure and six floor-isolated TMD structures with distinct layout configurations were developed using SAP2000 software. Elastic-plastic time-history analyses under rare earthquakes were conducted by selecting seven ground motion records (five natural and two artificial). The responses of different schemes, including base shear, inter-story shear, inter-story drift, and roof displacement, were compared. The findings indicate that floor-isolated TMD structures can effectively extend the natural vibration period of the structure, significantly reduce the base shear (by 20%~40%) as well as inter-story shear and drift (by 30%~70%), thus validating the seismic isolation and energy dissipation efficacy of this system under strong seismic excitations.