刚架拱桥拱索加固体系的受力特性

Mechanical behavior of rigid frame arch bridge strengthened by stayed cable

对某钢筋混凝土刚架拱桥提出了采用拱索体系的加固方法,用空间有限元对其受力特性进行了分析,并与试验测试值进行了比较.研究结果表明,对于用钢缆索斜拉法加固刚架拱桥的新结构,其空间受力效应明显;对处于软土地基上的桥的动力特征分析,必须考虑桥台与地基土壤之间的弹性抗力作用;原拱桥的面外刚度比面内刚度大,反映原拱桥具有足够的横向刚度.

Aiming at a typical reinforced concrete rigid frame arch bridge, the method for strengthening a concret rigid frame arch bridge by stayed cable is put forward. The static and dynamic behaviors are analyzed. The results from field testing show that the spatial effect of reinforced concrete rigid frame arch bridge strengthened by stayed cable is notable and analyzing. The dynamic behaviors in soft and weak soil foundation must be analyzed when the elastic resistance between abutment and soil foundation is considered. The stiffness of an out-plane structure is larger than that in-plane and the crude structure which have enough transverse stiffness.