Experimental study and parametric sensitivity analysis on mechanical properties of a novel energy-dissipative-unseating-prevention arc-shaped plate device
To solve the problem of unseating of bridge spans in small-and-medium-span simple-supported gird-er bridges under strong earthquakes,a novel energy-consuming and easy-to-install integrated energy-dissipa-tive-unseating-prevention arc-shaped plate device was developed.First,quasi-static tests were used to study the hysteretic energy dissipation behavior and fatigue failure mechanism of arc-shaped plate devices with differ-ent cross-sections.Then,numerical analysis was used to explore the influence of parameters on the skeleton curve and equivalent damping ratio of the device,and the unseating prevention behavior mode and ultimate ca-pacity of the arc-shaped plate device were supplemented.The results show that the proposed new arc-shaped plate device has excellent energy dissipation capacity.T-shaped arc-shaped plate structure is more reasonable,and the equivalent damping ratio can reach a maximum of nearly 40％.The device can be designed by separa-ting geometric parameters to design energy dissipation capacity,hysteretic strength,stiffness and displacement capacity.Increasing the web height h2 of the middle section is the most effective method to improve the energy dissipation capacity of the arc-shaped plate.Increasing h2 by 50％can increase the maximum strength by 50.1％and the equivalent damping ratio by about 4.7％.The proposed new unseating-prevention device can provide an integrated device solution for bridges with small-and-medium earthquake energy dissipation and strong earthquake flexible unseating-prevention.
万方数据
