门式墩纵向刚度及其对无缝线路纵向力的影响  

Longitudinal stiffness of frame pier and its influence on longitudinal force on CWR

作　　者：戴公连[1] 闫斌[1] 魏标[1] 

机构地区：[1]中南大学土木工程学院,湖南长沙410075

出　　处：《华中科技大学学报（自然科学版）》2012年第11期33-36,共4页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(50078006);中国博士后科学基金资助项目(2011M500983)

摘　　要：在以门式墩作为下部结构的高速铁路桥梁设计中,为简化门式墩纵向刚度的计算,推导了考虑两立柱抗推、抗扭刚度以及横梁抗弯刚度的门式墩整体纵向刚度表达式.在此基础上提出了参数优化方法,研究了门式墩纵向刚度的降低对梁轨相互作用的影响.分析表明:考虑抗扭刚度可将门式墩总刚度提高20%;与普通钢筋混凝土桥墩相比,门式墩所受墩顶水平力略有降低,但门式墩附近钢轨制动力增大;门式墩纵向刚度应尽量接近相邻桥墩以减小钢轨纵向力.In the high-speed railway bridge design of taking the frame pier as the substructure, to sim- plify the calculation of the longitudinal stiffness of the frame pier, the whole longitudinal stiffness ex- pression of the frame pier was derived considering the anti-push and torsional stiffness of columns and the beam bending stiffness. On this basis, the optimization methods of the parameters were investiga- ted. It was studied that lowering the longitudinal stiffness of the frame pier made an impact on beam- track interaction. The analysis shows： the longitudinal stiffness of frame pier can he made to increase 20% by the torsional stiffness. Compared with the normal reinforced concrete pier, the horizontal force on the frame pier is slightly lower and the rail braking force near it is larger. As much as possi- ble, the longitudinal stiffness of the frame pier should be close to the adjacent pier so as to decrease the longitudinal force on the rail.

关 键 词：铁路桥梁 桥面系 高速铁路 门式墩 纵向刚度 

分 类 号：U441.7[建筑科学—桥梁与隧道工程]