错孔拼宽连续梁桥翼缘板受力分析  

Force Analysis of Flange Plate of Staggered and Widened Continuous Girder Bridge

作　　者：汪泉清[1] 严宜州 WANG Quan-qing;YAN Yi-zhou(CCCC Second Highway Consultants Co.Ltd.,Wuhan 430056,China)

机构地区：[1]中交第二公路勘察设计研究院有限公司,武汉市430056

出　　处：《公路》2024年第7期305-309,共5页Highway

摘　　要：为了研究错孔拼宽连续梁桥翼缘板的受力状况,采用Midas软件建立全桥梁格模型,计算分析了多种因素对新旧桥梁之间翼缘板内力的影响,并提出了拼宽后旧桥翼缘板的加固措施。研究表明,收缩徐变对翼缘板的受力影响相对较小,选择在新桥建成后3~6个月之间进行新旧桥梁的拼接是合适的,过长的延长拼接时间意义不大;错孔拼宽的连续梁桥要充分考虑新桥基础沉降的影响,新桥基础设计时应尽量减小其沉降;预应力连续梁要注意纵向预应力钢束产生的翼缘板横向次内力,但新桥预应力钢束的松弛对翼缘板内力基本没有影响;错孔拼宽后翼缘板受力比较复杂,活载的局部加载无法正确反映翼缘板的受力状况,需要进行全桥建模分析。In order to study the stress status of the flange plate of the staggered hole continuous beam bridge,the whole bridge lattice model is established by Midas,the influence of various factors on the internal force of the flange plate between the old and new bridges is calculated and analyzed,and the reinforcement measures of the flange plate of the old bridge after the widening are proposed.Research shows that the effect of shrinkage creep on the flange plate is relatively small,it is appropriate to choose to splicing the old and new bridges between 3~6 months after the completion of the new bridge,and it doesn't make much sense to extend the splicing time too long.The continuous beam of staggered hole splicing should fully consider the influence of the settlement of the foundation of the new bridge,and the settlement should be minimized when designing the foundation of the new bridge.The prestressed continuous beam should pay attention to the transverse secondary internal force of the flange plate generated by the longitudinal prestressed steel bundle,but the relaxation of the prestressed steel bundle of the new bridge has basically no effect on the internal force of the flange plate.The force of the flange plate after the hole is widened is complicated,and the local loading of the live load cannot correctly reflect the force of the flange plate,and the full-bridge modeling analysis is required.

关 键 词：桥梁工程 连续梁桥 翼缘板 收缩徐变 沉降 错孔 拼宽桥 

分 类 号：U445.6[建筑科学—桥梁与隧道工程]