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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 design of the high-speed railway bridge with the gable pier as the substructure, in order to simplify the calculation of the longitudinal stiffness of the gable pier, the overall longitudinal stiffness expression of the gable pier considering the anti-push and torsional stiffness of the two columns and the flexural rigidity of the beam is derived Based on this, the parameter optimization method is proposed, and the influence of the reduction of the longitudinal rigidity of the portal pier on the interaction between the beam and the rail is studied. The analysis shows that the total stiffness of the portal piers can be increased by 20% considering the torsional stiffness. Compared with the ordinary reinforced concrete piers However, the braking force of the rail near the piers increases. The longitudinal stiffness of the piers should be as close as possible to the adjacent piers to reduce the rail longitudinal force.