中文摘要：

针对近几年大跨桥上CRTSⅠ型板式无砟轨道梁端半圆凸形挡台的剪切破坏现象，参考国内某连续刚构桥实际参数，根据桥梁梁端半圆形凸形挡台的配筋计算出凸形挡台的设计承载力，基于有限元方法，建立线板桥墩一体化计算模型，计算分析在不同扣件阻力，桥梁温度跨度和桥墩线刚度等因素下的梁端半圆形凸形挡台受力。结果表明：扣件纵向阻力是梁端凸台剪切破坏的主要影响因素，随着扣件纵向阻力的增大，梁端半圆形凸形挡台所受纵向力也随之增大，当扣件纵向阻力达到17.0kN/m/轨时，凸形挡台所受纵向力将会超过凸形挡台的抗剪承载力，即发生破坏；桥梁温度跨度、桥墩线刚度、有无起制动力对梁端半圆形凸台所受纵向力影响很小。

英文摘要：

In view of the racking of bollard of CRTS Ⅰ slab track on large-span bridge in recent years, with reference to the actual parameters of domestic continuous rigid frame bridge and on the basis of the reinforcement of the semi-circular bollard of the bridge-end, the design bearing capacity of semi-circular bollard is calculated. An integration model of beam-slab-bridge-pier is established based on the finite element method and the bearing capacity of the bridge-end semi-circular bollard is analyzed and calculated under different fastening resistance, temperature span and linear stiffness of piers. The results show that the longitudinal resistance of fasteners is the main affecting factor for the cracking of the bollard, and the longitudinal force increases with the increasing of the longitudinal resistance of fasteners,＆nbsp;which leads to cracking when the longitudinal resistance reaches 17. 0 kN/m/rail since the longitudinal force of the bollard will be over its shear strength. However, the bridge temperature span, and the linear stiffness of piers and braking force have little effect on the longitudinal force of the bollard.