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对采用黏滞流体消能器(VFD)加固的某钢筋混凝土框架结构的抗震性能进行了研究。首先对采用不同阻尼系数和速度指数的VFD进行加固时结构的附加阻尼比进行了比较,得到了较为合适的VFD参数。接着采用MSC.MARC软件对原结构和加固后的结构进行了动力弹塑性时程分析与比较研究,开发了用于模拟钢筋混凝土框架梁与柱的纤维梁单元子程序,采用分层壳单元模拟钢筋混凝土楼板,对未加固和加固后的结构位移、层间位移角等进行了考察,对VFD的地震反应进行了分析,并对关键构件的应变-应力滞回关系进行了分析。分析结果表明,未加固结构在罕遇地震下存在倒塌的风险,增设VFD可显著提高结构的抗震能力,结构达到了“大震不倒”的抗震设防目标。
The seismic performance of a reinforced concrete frame structure reinforced with viscous fluid energy dissipater (VFD) was studied. Firstly, the additional damping ratio of the structure is compared with the VFD with different damping coefficient and speed index, and the more suitable VFD parameters are obtained. Then the dynamic elastic-plastic time-history analysis and comparison of the original structure and the reinforced structure are carried out by using the MSC.MARC software. The sub-program of the fiber beam unit for simulating the reinforced concrete frame beams and columns is developed. The layered shell element simulation Reinforced concrete floor, unconfined and reinforced structural displacement, interlayer displacement angle were investigated, the seismic response of VFD was analyzed, and the strain-stress hysteretic relationship of the key components was analyzed. The results show that there is a risk of collapse of the unconfined structure under rare earthquakes. The addition of VFD can significantly improve the seismic capacity of the structure, and the structure achieves the goal of aseismic fortification.