考虑系梁作用高墩刚构桥整体稳定的实用算法  

Practical Calculation Method for the Overall Stability of High-pier Rigid Frame Bridges Considering the Effect of Tie Beams

作　　者：兰树伟 周东华[2] 陈旭[1] 王道航 LAN Shuwei;ZHOU Donghua;CHEN Xu;WANG Daohang(Kunming University,Kunming,Yunnan 650214,China;Kunming University of Science and Technology,Kunming,Yunnan 650500,China)

机构地区：[1]昆明学院,昆明650214 [2]昆明理工大学,昆明650500

出　　处：《铁道工程学报》2024年第9期36-41,48,共7页Journal of Railway Engineering Society

基　　金：国家自然科学基金项目(51868034);云南省科技厅基础研究专项面上项目(202401AT070031);昆明学院引进人才科研项目(XJ20210029)。

摘　　要：研究目的:高墩刚构桥柱式高墩间常常设置系梁,目前计算高墩刚构桥整体稳定主要有计算长度系数法和有限元法,计算长度系数法须逐根桥墩计算且无法考虑不同系梁间桥墩段的影响,有限元法由于计算理论和方法都隐含在软件中,如何对计算结果的准确性和可靠性进行验证又是必须解决的难题。为此,本文基于摇摆柱受力特点通过结构转换的概念将确定柱式高墩刚构桥整体稳定的二阶计算转化为确定其整体抗侧刚度的一阶问题。研究结论:(1)本文提供了一种通过结构抗侧刚度求解高墩刚构桥整体稳定临界力的计算方法;(2)本文给出了柱式高墩刚构桥整体稳定临界力的计算公式,该式能考虑柱墩之间系梁的影响,弥补了规范计算长度系数法的不足,具有很好的精度及准确性,可为校核有限元整体稳定计算结果的可靠性提供一种解析验证手段;(3)本文研究成果可供桥梁工程设计和理论计算使用。Research purposes:Tie beams are often installed between the columns of high-pier rigid frame bridges.Currently,the calculation of the overall stability of high-pier rigid frame bridges mainly includes the calculation length coefficient method and the finite element method.The calculation length coefficient method for each component checking cannot consider the influence of different tie beam segments between the bridge piers.As the calculation theory and method are implicit in software,how to verify the accuracy and reliability of the calculation results in the finite element method is a difficult problem that must be solved.Therefore,based on force characteristics of the rocking column in this paper,the second-order calculation for solving the overall stability critical bearing capacity of high-pier frame bridges is transformed into the first-order problem to determine the overall lateral stiffness of structures through the concept of structural conversion.Research conclusions:(1)A calculation method for the critical force of the overall stability of high-pier rigid frame bridges is provided by calculating the structural lateral stiffness in this paper.(2)This paper provides a calculation formula for the critical force of the overall stability of column-typed high-pier rigid frame bridges.This formula can consider the influence of beam ties between column piers,compensate for the shortcomings of the standard calculation length coefficient method,and has good accuracy and precision.It can provide an analytical verification method for checking the reliability of the overall stability of the finite element calculation results.(3)The research results can be used for bridge engineering design and theoretical calculations.

关 键 词：高墩桥梁 系梁 抗侧刚度 整体稳定 临界因子 临界力 

分 类 号：U441.2[建筑科学—桥梁与隧道工程]