内倾桥塔临时主动横撑施工有限元仿真与实桥试验  

Finite Element Simulation and Actual Bridge Test of Construction of Temporary Active Transverse Brace of Inward-inclined Bridge Tower

作　　者：赛志毅 陈恒 刘航 白光耀 党王辉 牛艳伟[2] SAI Zhi-yi;CHEN Heng;LIU Hang;BAI Guang-yao;DANG Wang-hui;NIU Yan-wei(ShandongHi-speed Company Limited,Jinan 250014,China;Schoolof Highway,Chang'an University,Xi'an710064,China;Shandong Provincial Communications Planning and Design Institute Group Co.Ltd.,Jinan 250014,China)

机构地区：[1]山东高速股份有限公司,济南市250014 [2]长安大学公路学院,西安市710064 [3]山东省交通规划设计院集团有限公司,济南市250014

出　　处：《公路》2023年第10期161-167,共7页Highway

基　　金：国家自然科学基金,项目编号51208056;中央高校基本科研业务费专项资金,项目编号300102212909;陕西省自然科学基础研究计划,项目编号2023-JC-YB-292。

摘　　要：以某悬索桥内倾式桥塔施工为研究背景,采用杆系和实体单元两种建模方法对内倾桥塔进行有限元仿真,确定杆系模型的计算精度以及内倾桥塔主动横撑施加的具体位置和顶推力大小,并对施工过程中塔底应力进行现场试验。研究结果表明,当桥塔倾角较小时(5°),采用杆系单元进行建模分析的计算速度快,且具有较高的计算精度;当倾角为15°时,杆系模型误差超过30%,建议采用实体模型进行计算。主动横撑在未施加下横梁之前对于塔柱根部应力的控制起到关键作用,施工完横梁后主动横撑与下部塔柱形成闭合的框架结构,后续的横撑对于塔柱底部应力的影响较小。与增加临时横撑数量相比,提高顶推力可起到改善塔底截面应力的作用。通过调整主动横撑位置,并施加合适的主动顶推力,可大幅度改善塔柱根部的受力状况。Taking the construction of a suspension bridge's inward-inclined tower as the research background,the finite element simulation of the inward-inclined bridge tower is carried out by using the two modeling methods of the rod system and the solid element.The calculation accuracy of the rod system model,the specific position and the jacking force applied by the active transverse brace of the inward-inclined bridge tower are determined,and the field test of the tower bottom stress during the construction process is carried out.The results show that:when the inclination angle of the bridge tower is small(5°),the rod system element is used for modeling and analysis,which has fast calculation speed and high calculation accuracy;when the inclination angle is 15°,the error of the rod system model exceeds 30%,and it is recommended to use the solid model for calculation;the active cross brace plays a key role in controlling the stress at the bottom of the tower column before the lower cross beam is applied.After the construction of the cross beam,the active cross brace forms a closed frame structure with the lower tower column,and the subsequent cross brace has minor impact on the stress at the bottom of the tower column;compared with increasing the number of temporary cross braces,increase the jacking force can improve the stress at the bottom of the tower,and by adjusting the position of the active cross braces and applying the appropriate active jacking force,the stress at the root of the tower column can be greatly improved.

关 键 词：悬索桥 内倾式桥塔 主动横撑 有限元分析 实桥试验 

分 类 号：U446.1[建筑科学—桥梁与隧道工程]