轨道交通桥梁球形支座抗震分析研究

Anti-Earthquake Analysis Research of Spherical Bearing of Rail Transit Bridge

针对一条位于高烈度震区的轨道交通标准段桥梁,按照能力保护思想对球形支座的地震水平力进行详细计算分析,确定支座的设计水平承载力。该水平承载力需达支座竖向承载力的64%~80%,已超过绝大多数球形支座产品标准。根据计算和分析,发现按能力保护原则计算的水平力与E1地震下的支座水平力大致成正比,二者比值约为2.7。

Aiming at a rail transit standard section bridge in high-intensity earthquake area,according to the idea of capacity protection,the horizontal force of the spherical bearing is calculated and analyzed in detail,and the designed horizontal force of the bearing is determined.The horizontal bearing capacity of the bearing has reached from 64% to 80% of the vertical bearing capacity,exceeding the standards of vast majority spherical bearing products.Based on calculation& analysis,it is found that the horizontal force calculated by the principle of capacity protection is roughly proportional to the horizontal force of the bearing under the E1 earthquake,and the ratio is about 2.7.