基于吊拉协同方法的钢筋混凝土系杆拱加固效果研究

Reinforcement effect of reinforced concrete tied arch based on hanging and pulling cooperative method

针对湖州地区在役钢筋混凝土系杆拱桥,在长期荷载作用下产生的病害特点,采用吊拉协同主动加固方法以恢复原结构承载能力.利用Midas Civil软件进行有限元仿真分析,对结构加固前、后各主要构件的内力及位移状态进行了理论对比分析,并对加固后结构主要构件的应力及位移状态进行了实桥监测,通过理论分析与实测数据验证了钢筋混凝土系杆拱吊拉协同补强主动加固方法在工程应用中的实际效果.理论分析与实测数据表明:采用吊拉协同主动加固方法,使新吊杆发挥了良好的协同补强作用,使原混凝土刚性吊杆处于全截面受压状态,抑制了已有裂缝的开展,改善了原结构拱肋及系杆的受力分布状态,保证了结构的正常使用,提高了结构的安全性和耐久性,达到了预期加固效果,为日后同类型结构的加固方法提供了理论依据及实桥参考.

In view of the disease characteristics of an existing reinforced concrete tied arch bridge in Huzhou,under the long-term load,the active reinforcement method is adopted to restore the bearing capacity of the original structure.In the paper,the finite element simulation analysis using Midas Civil software,the structure before and after strengthening the internal force and displacement state of main components were compared,and the main components of the structure after reinforcement stress and displacement state for bridge monitoring data were put to practical examination,through theoretical analysis and the real test of reinforced concrete tied arch cable-stayed suspension,the cooperative effect active reinforcement method in engineering application of reinforcement was also verified.Theoretical analysis and experimental data show that：as the new boom played a synergistic reinforcement effect,the original concrete rigid suspender in section compression state,has inhibited the development of crack,and the stress distribution state improves the structure of arch rib and tied.In ensuring the normal use of the structure,improving the safety and durability the structure and achieving the desired effect of reinforcement.This method may provide a theoretical basis for reference and bridge reinforcement method of the same type of structure after day.