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文章以一座16m跨径石拱桥为例,首先介绍了该桥的基本情况,然后对加固后的桥梁进行了环境振动测试和模态识别,并用实测动力特性对加固后有限元模型进行修正,进而利用修正的有限元对该桥套拱加固前后的承载能力进行了评估,进一步分析套拱厚度、套拱混凝土强度等级、套拱和主拱圈的粘结强度等对套拱加固效果的影响。结果表明:拱下套拱加固是提高石拱桥的承载能力的有效方法,但套拱厚度并非越厚越好,对于16m跨径拱桥,在公路Ⅰ级汽车荷载作用下经济合理的套拱加固厚度为30cm。
Taking a 16m span stone arch bridge as an example, the basic situation of the bridge is introduced firstly. Then the environmental vibration test and modal identification of the reinforced bridge are carried out, and the finite element model is corrected with the measured dynamic characteristics. The modified finite element method was used to evaluate the bearing capacity of arch bridge before and after its reinforcement. The influence of arch thickness, the strength of the arch-arch concrete, the bond strength of the arch arch and the main arch ring on the reinforcement effect of the arch was further analyzed. The results show that the arch arch reinforcement is an effective way to improve the bearing capacity of the stone arch bridge, but the thickness of the arch arch is not as thick as possible. For the 16 m span arch bridge, under the Class I automobile load, the economical and reasonable arch reinforcement thickness Is 30cm.