设置阻尼器后门式刚架的减震分析

Aseismic Analysis of Portal Frame with Dampers

运用有限元理论及商业软件ANSYS建立了考虑材料非线性和几何非线性的空间模型,并考虑了大吨位的吊车荷载作用,进行了罕遇地震下的时程分析.通过对原结构和设置粘弹性阻尼器的结构分析对比,结果表明:设置粘弹性阻尼器使结构的纵向位移显著减小,明显的改善了刚性系杆的受力性能,保护了主体结构的安全,大幅度减小了结构底部总剪力,并改善了门式刚架的纵向抗震性能,使门式刚架的吊车吨位限值由20 t提升到32 t.

A nonlinear space model of the portal frame with a crane was built on the basis of the principles of finite element amalysis with the software ANSYS. By considering the crane load of large tonnage, the portal frame with viscoelastic dampers （VEDS） and the portal frame without viscoelastic dampers were studied by time analysis under occasional earthquakes. The results indicate that the longitudinal displacement of the structure with viscoelastic dampers is reduced notablely. The property of rigid tie bar is im- proved obviously and the total shear in the bottom is lessened to a large extent. The longistudinal aseismic ability of the portal frame with a large crane load is raised remarkably. The crane tonnage is increased from 20 tons to 32 tons.