异形桥墩的裂缝分析及加固方案研究
Research on Crack Analysis and Reinforcement Scheme of Special-shaped Pier
吴广1
作者信息
- 1. 武汉市汉阳市政建设集团有限公司 430050
- 折叠
摘要
本文介绍了某跨湖预应力混凝土箱梁桥异形桥墩墩底月牙裂缝分布及调查外部影响因素,运用大型有限元软件Midas civil和FEA NX进行数值分析,分析墩底月牙应力情况,并在此基础上论述裂缝成因.针对墩底月牙裂缝引起的结构刚度弱化,影响结构安全问题,综合考虑加固效果、经济性、适用性和耐久性等因素,经过几个加固方案的比较,最终提出一种钢壳结合体外预应力的加固方法.从计算分析及施工要点等方面对该方法进行了详细论述,并成功将其运用于实际工程.通过加固后的实桥检测,验证了该加固方法的良好效果,可为同类结构形式桥梁的维修加固提供参考.
Abstract
In this paper,the distribution of the crescent-fracture at the bottom of a special-shaped pier of a cross-lake prestressed concrete box girder bridge was introduced and the external influencing factors were inves-tigated.The numerical analysis was carried out by using large finite element software Midas civil and FEA NX to analyze the crescent-stress at the bottom of the pier,and the causes of the crescent-fracture were discussed on this basis.In view of the structural stiffness weakening caused by the crescence cracks at the bottom of the pier,which affected the structural safety,a reinforcement method of steel shell combined with external prestressing was proposed after considering the reinforcement effect,economy,applicability and durability.The method was discussed in detail from the calculation analysis and construction points,and it was successfully applied to prac-tical projects.The good effect of the reinforcement method was verified by the real bridge inspection after rein-forcement,which could provide reference for the maintenance and reinforcement of similar structural bridges.
关键词
异形桥墩/数值分析/裂缝成因/体外预应力/加固方法Key words
Shaped pier/Numerical analysis/Fracture genesis/External prestressing/Reinforcement method引用本文复制引用
出版年
2024
NETL
NSTL
万方数据