中文摘要：

为研究制动力作用下高速铁路简支梁桥与CRTS Ⅱ型板式无砟轨道的相互作用问题，以沪昆高铁上某12＆#215;32 m双线简支箱梁为工程背景，建立考虑钢轨－轨道板－底座板－梁体－墩台的一体化有限元模型，系统分析单线制动和双线同向制动工况下轨道和桥梁结构的受力及变形规律。研究结果表明：钢轨制动力及位移对加载位置极为敏感，检算时应考虑多种荷载位置的影响；单线制动作用下钢轨与轨道板相对位移、CA砂浆剪切位移、桥梁和底座板相对位移均处于弹性范围内；当车辆在桥上靠近桥台处制动时，摩擦板可有效地减少传递至路基段的纵向力；双线同向制动作用下各项效应与单线制动有载侧趋势相同，桥梁和底座板将发生相对滑动。

英文摘要：

The 12 multiply by 32 m double-track simply-supported box beam in the Shanghai-Kunming rail-way was cited as an example to study the track-bridge interaction between the high-railway simply-supported bridge and CRTS Ⅱballastless track under braking force.The integration finite element model of rail-beam-slab-base board-pier was established to analyze the law of stress and deformation on the structures under the condition of single and double lines braking.The research results show that,the braking force and displacement of trail are extremely sensitive to loading position,and hence various load positions should be considered;under the load of single line braking,the displacement between rail and slab,shear displacement of CA mortar and the displacement between bridge and bedplate are in the elastic range;when the train brakes near the bridge abut-ment,the friction plate can decrease the longitudinal force transmitting to the subgrade section effectively;the a-bove-mentioned effects of track under the case of braking on both lines are similar with the loaded track under the case of braking on a single line,and relative sliding will occur between bridge and bedplate as well.