连续宽箱梁桥单墩力同步顶升横向效应分析

Analysis of Lateral Effect of Single Pier Force Synchronous Jacking on Continuous Wide Box Girder Bridge

针对某双箱多室预应力混凝土连续宽箱梁的单墩顶升更换支座工程,建立桥梁多尺度仿真模型。分析单墩力同步顶升下结构的横向应力及位移变化规律,验证单墩力同步顶升的可行性。结合梁端横向位移影响线,确定结构横桥向最不利顶力偏差工况。分析最不利工况下结构的横桥向正应力及位移变化规律,明确桥梁顶升施工过程的顶力与位移同步偏差的控制值。可为同类桥梁的单墩力同步顶升工程提供参考。

A multi-scale simulation model was established for support replacement using the single pier force synchronous jacking of a double-box multi-chamber prestressed concrete continuous wide box girder.The variation law of lateral stress and displacement of the structure under single pier force synchronous jacking were analyzed,and whose feasibility were verified.Combined with the influence line of the transverse displacement of the beam end,the most unfavorable jacking force deviation of the structure was determined.The change law of cross bridge normal stress and displacement under the most unfavorable working conditions were analyzed,and the control value of the synchronous deviation between the jacking force and displacement during the jacking construction was determined,which can provide reference for the single pier force synchronous jacking engineering of similar Bridges.