斜交跨线连续梁桥换梁施工受力分析  

Stress Analysis of Beam Replacement Construction of Skew Cross-line Continuous Beam Bridge

作　　者：蔡保硕 赵雪璞 扈利 王坤 杨勇 Cai Baoshuo;Zhao Xuepu;Hu Li;Wang Kun;Yang Yong(Beijing General Municipal Engineering Design&Research Institute Co.,Ltd.,100082,China;Beijing Engineering Research Center of Urban Bridge Security,100082,China;Beijing Urban Road Maintenance Management Center,100069,China)

机构地区：[1]北京市市政工程设计研究总院有限公司,100082 [2]北京市城市桥梁安全保障工程技术研究中心,100082 [3]北京市城市道路养护管理中心,100069

出　　处：《特种结构》2023年第4期88-92,共5页Special Structures

摘　　要：为研究斜交跨线连续梁桥换梁施工阶段的受力情况,对某斜交跨高速桥梁换梁施工进行了数值模拟。分析了换梁过程中主梁内力及桥梁挠度变化量,对不同施工阶段桥梁的受力情况进行了研究。结果表明,连续梁换梁施工存在着由连续体系转变为简支体系的体系转换,随着桥梁上部结构分段拆除,主梁的内力及挠度均有所增加,且在最终变为简支结构时达到最大;新钢梁在架设拼装过程中应力变化不大,施加二期荷载后,梁体应力虽有较大程度的增加,但成桥阶段是钢桥的受力控制点。In order to study the stress situation of the beam replacement construction stage of the skew cross-line continuous beam bridge,the numerical simulation of the beam replacement construction of a skew cross-line high-speed bridge was carried out.The variation of the internal force of the main beam and the deflection of the bridge during the beam replacement process were analyzed at different construction stages.The results show that there is a system transformation from the continuous system to the simply supported system in the continuous beam replacement construction.With the removal of the upper structure of the bridge in sections,the internal force and deflection of the main beam will increase and reach the maximum when it finally becomes a simplysupported structure.The stress of the new steel beam changes a little during the erection and assembly process.While the stress of the beam body increases a lot after the secondary load is applied,the control stress of the steel bridge still appears at the completion stage.

关 键 词：斜交跨线连续梁桥 换梁施工 施工阶段受力分析 

分 类 号：U445.4[建筑科学—桥梁与隧道工程]