桥梁顶升施工墩柱不同步效应影响分析研究

Analysis and Study on Influence of Non-synchronous Effect of Pier Column in Bridge Jacking Construction

以某三跨预应力混凝土连续梁结构调坡顶升施工为工程背景,研究桥梁顶升墩柱之间不同步位移差的力学行为和其控制方法。首先,采用梁格模型与参数化分析方法对比仅不同墩柱之间在较大的顶升位移差以及同时考虑横桥向顶升位移差对主体结构的影响,准确地评估顶升墩柱不同步效应对桥梁受力的影响,并基于结构应力提出3个位移量级,从而提出基于位移差的性能控制量化分析;其次,基于主梁抗裂控制要求,提出采用不同墩柱位移差来衡量顶升施工质量,并分析此位移差对结构受力性能的影响,为快速判断顶升施工安全性提供参考思路;最后,通过实例工程实施及相关监测数据验证不同步性位移量级性能控制方法,为类似工程提供参考。

Taking the slope adjustment and jacking of one three-span prestressed concrete continuous beam bridge as the engineering background,the mechanical behavior of non-synchronous displacement difference among the piers in bridge jacking and its control methods are studied.Firstly,the grillage model and parameter analysis method are used to compare the jacking displacement difference among the piers.And at the same time,the impact of transverse jacking displacement of bridge on the main structure is considered to accurately assess the impact of non-synchronous effect of jacking piers on the stress of bridge.Based on the structure stress,three displacement orders are proposed,and then the quantitative analysis of performance control based on displacement difference is proposed.Secondly,based on the anti-crack control requirements of the main beam,the non-synchronous displacement difference of pier is proposed to balance the jacking construction quality,and analyze the impact of this displacement difference on the stress performance of the structure,which provides the referring thought for judging the safety of jacking construction quickly.Finally,the performance control method of non-synchronous displacement magnitude is verified by the engineering implementation of practical projects and the relative monitoring data,which provides the reference for the similar projects.