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。
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.
作者
吴广
Wu Guang(Wuhan Hanyang Municipal Construction Group Co.,Ltd.,430050,China)
出处
《特种结构》
2024年第3期47-51,共5页
Special Structures
关键词
异形桥墩
数值分析
裂缝成因
体外预应力
加固方法
Shaped pier
Numerical analysis
Fracture genesis
External prestressing
Reinforcement method
