城际铁路单跨门式刚构设计研究  

Research on the design of single span portal rigid frame for Inter-City railways

作　　者：冀奎名 JI Kuiming(China Railway SIYUAN Survey and Design Group Co.,Ltd.,Wuhan,430000)

机构地区：[1]中铁第四勘察设计院集团有限公司桥梁院,武汉430000

出　　处：《铁道勘测与设计》2024年第3期54-56,共3页Railway Survey and Design

摘　　要：结合工程设计实例,通过调整刚构的墩高、桥墩壁厚及承台底边界条件来改变结构刚度,研究单跨门式刚构刚度对桥梁结构受力的影响。结果表明对于单跨门式刚构桥,桥墩刚度对于梁部受力影响较小;桥墩刚度越大,桥墩的恒载弯矩越大;承台底的边界条件对结构体系内力影响较大,应考虑桩土相互作用的影响;m值越大,墩顶恒载弯矩越大,主梁梁端恒载负弯矩绝对值越大,整体温度、梯度温度效应对应的弯矩也越大,应考虑不同m取值下结构内力差异,并按照最不利结果进行设计。This article combines engineering design examples to study the influence of single span portal rigid frame stiffness on the stress of bridge structures by adjusting the pier height,pier wall thickness,and bottom boundary conditions of the pier cap to change the structural stiffness.The results show that for a single span portal rigid frame bridge,the stiffness of the piers has a relatively small impact on the stress on the beam;The greater the stiffness of the bridge pier,the greater the constant load bending moment of the bridge pier;The boundary conditions at the bottom of the pier have a significant impact on the internal forces of the structural system,and the influence of pile soil interaction should be considered;The larger the value of m,the greater the constant load bending moment at the top of the pier,and the greater the absolute negative bending moment at the end of the main beam under constant load.The bending moment corresponding to the overall temperature and gradient temperature effects is also larger.The differences in internal forces of the structure under different values of m should be considered,and the design should be based on the most unfavorable results.

关 键 词：单跨门式刚构 刚度 桩土作用 M法 

分 类 号：U44[建筑科学—桥梁与隧道工程]