悬挂质量结构减震性能及影响因素分析

Analysis on the Vibration Reduction Performance and Influence Factor of Suspend Structure

提出了悬吊结构有限元计算的模型及各参数的计算方法,在大量有限元计算的基础上对悬吊结构体系的减震性能进行了分析,并分析了结构刚度和场地类型对其减震效果的影响.并对比了反应谱分析和时程分析的减震率区别,发现现行反应谱在对悬吊结构设计时具有一定的局限性.

The finite element model of the suspending structure and the computing method of the parameters are put forward. The Spring-damp element is put forward to simulate the dynamic influence of the suspending part on the frame. Spectrum analysis and Time-history analysis are done for the suspending structure with different mass,its vibration reduction performance is analyzed based on large numbers of calculation by finite element method, and how the structure stiffness and soil type act on the vibration performance is also analyzed. It is found that the vibration reduction performance of the suspending structure is excellent and its vibration reduction ratio increase while its suspended mass increase. Through the comparison of the results of the spectrum analysis and time-history analysis, it is found that the present spectrum has restrictions in designing of the suspend structure,so the suspending structure can be used for the structures whose live load and quasi-permanent value are very large, such as the library and some workshop building. Compared with the TMD system, the suspending structure which taking the live load as the mass has the same vibration reduction performance, and it also can reduce the fabrication cost.