曲线连续梁桥支座模型对结构地震反应影响分析

针对桥梁结构分析中常将聚四氟乙烯滑板橡胶支座处理成理想活动支座而忽略滑板与梁底钢板间摩擦耗能作用问题，采用双线性模型及摩擦滑动单元分别模拟滑板支座进行非线性时程分析，获得支座及结构反应。分析结果表明，理想的活动支座模型会高估桥梁的地震反应，双线性模型与摩擦滑动单元模型分析结果接近；摩擦滑动单元能考虑支座竖向力变化对摩擦力影响及曲线桥支座负反力情况，更符合实际，适用性更广。

Effect of bearing model on the seismic response of curved continuous girder bridge

Teflon slide rubber bearing is often used on bridge. The ideal expansion bearing element is usually adopted to simulate this rubber bearing in analysis. This ideal expansion bearing model will ignore friction between Teflon layer and steel surface. This paper takes one curved continuous girder bridge as an example, and employs bilinear sliding bearing element and friction isolator elements to simulate Teflon slide bearings on this bridge. Nonlinear dynamic analysis results show that seismic responses of bridge in which the slide rubber bearings are modeled as ideal expansion bearing elements are overestimated. Seismic responses of bridge adopting bilinear sliding bearing model is similar to that of bridge adopting friction isolator model. Friction isolator can consider the varying friction force of bearing, so using this model to simulate Teflon slide rubber bearing is accordance with the actual case.