曲线连续梁桥支座模型对结构地震反应影响分析
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摘要
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。
Teflon slide rubber bearing is often used on bridge. An imaginery expansion bearing element is usually adopted to simulate this rubber bearing in analysis. This imaginary expansion bearing model will ignore the friction between teflon layer and steel surface. A curved continuous girder bridge was taken as an example,bilinear sliding bearing element and friction isolator elements were employed respectively to simulate teflon slide bearings on the bridge.The results of nonlinear dynamic analysis show that seismic responses of bridge on which the slide rubber bearings are modeled as imaginary expansion bearing elements are overestimated. Seismic responses of bridge adopting bilinear sliding bearing model is similar to those of bridge adopting friction isolator model. Friction isolator can consider the varying friction force of bearing,so the use of this model to simulate teflon slide rubber bearing is in coincidence with the actual case.
引文
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