连梁金属阻尼器在大底盘多塔中的设计与应用

Application and design of coupling beam metal dampers in the high-rise multi towers with enlarged base

连梁作为剪力墙结构中的薄弱部位,在地震作用下往往破坏严重。因此设计了一种连梁金属阻尼器,介绍了连梁金属阻尼器的设计方法。为了研究金属连梁阻尼器的减震效果,针对合肥某大底盘多塔结构进行弹塑性时程分析,结构各指标均满足规范要求,但罕遇地震下连梁的破坏严重。在此引入剪切型金属连梁阻尼器,根据抗震性能及规范要求确定阻尼器的设计原则并确定了阻尼器力学参数的计算方法,利用有限元软件数值仿真的结果与计算值误差较小。将设计得到的阻尼器布置在破坏严重的连梁跨中,并对减震结构进行时程分析。结果表明:阻尼器能有效减轻连梁破坏,框架梁破坏也有一定程度减小;对于基底剪力、层间位移角及顶点位移均有不同程度的限制作用;满足小震下弹性大震下弹塑性的设计要求。

As a weak part of shear wall structure,coupling beam is often damaged seriously under earthquake.Therefore,a kind of coupling beam metal damper is designed,and the design method of coupling beam metal damper is introduced.In order to getting the damping effect of metal coupling beam damper,the elastoplastic time history analysis of a multi tower structure in Hefei is carried out.Each index of the structure meets the code requirements,but the coupling beam is seriously damaged in rare earthquakes.In this paper,the shear type metal coupling beam damper is introduced,the design principle of the damper is determined according to the seismic performance and code requirements,and the calculation method of the mechanical parameters of the damper is determined.The error between the numerical simulation results and the calculated values using the finite element software is small.The damper is arranged in the mid span of the coupling beam with serious damage,and the time history analysis of the damping structure is carried out.The results show that the damper can effectively reduce the damage of coupling beam and the damage of frame beam to a certain extent.For the base shear force,the inter story displacement angle and the vertex displacement,there are different degrees of restrictions.It meets the design requirements of elasticity under small earthquake and elastoplasticity under large earthquake.