结构工程师2012，Vol.28Issue(4)：78-83,6.
简支梁桥位移与内力动力系数差异研究
Study on Differences between Displacement and Internal Force Dynamic Impact Factor of Simply-Supported Bridges
摘要
Abstract
Dynamic impact factor is a fundamental and key parameter in bridge design and rating. It can be expressed by a displacement magnification factor;or a force ( including bending moment and shear force ) magnification factor. The value difference between these magnification factors has never been noticed in practice. By an analytical approach;the similarities and differences of displacement and force magnification factor were studied;and the variation law of impact factor along bridge span was identified;which provided theoretical foundation for the establishment of different reasonable formula for impactfactors of bridges. Impact factors were calculated using coupled vehicle-bridge interaction model and uncoupled model simulating the train as a series of non-vibrant constant moving loads. The differences are analyzed and the rationality of studies on dynamic impact factor using uncoupled vehicle-bridge model was discussed. It was found that studies on dynamic impact factor using uncoupled vehicle-bridge model is reliable and safe. Then non-dimensional key parameters of impact factor can be obtained by uncoupled model.关键词
简支梁桥/位移与内力动力系数/移动荷载列过桥/车桥耦合Key words
simple-supported beam bridge/displacement and internal force dynamic magnification factor,moving load sequence/vehicle-bridge interaction引用本文复制引用
吕佳,吴定俊,李奇..简支梁桥位移与内力动力系数差异研究[J].结构工程师,2012,28(4):78-83,6.基金项目
高等学校博士学科点专攻科研基金(20090072110044) （20090072110044）
