大跨度中承式系杆拱桥荷载试验方法

以某主桥(40+185+40)m大跨度中承式系杆拱桥的竣工验收荷载试验为背景,使用桥梁专用计算软件建立有限元模型,进行荷载试验理论值计算,分析了大跨度中承式系杆拱桥在等效试验荷载作用下的变形、应力特性。通过荷载试验实测值和计算理论值的比较,分析结构校验系数,得出该桥的实际强度、刚度以及了解桥梁结构的实际工作状况。采用脉动测试方法对该桥的自振特性参数进行分析,综合分析评定该大跨度中承式系杆拱桥的承载能力,同时为同类型结构的桥梁荷载试验方法提供参考意义。

Based on the completion acceptance test of a main bridge(40+185+40)m long span mid-supported tied arch bridge,the finite element model was built using the bridge-specific calculation software,and the theoretical calculation of the load test was carried out to analyze the large span.Deformation and stress characteristics of the bearing type arch bridge under the equivalent test load.Through the comparison between the measured value of the load test and the calculated theoretical value,the structural check coefficient is analyzed,and the actual strength and stiffness of the bridge and the actual working condition of the bridge structure are obtained.The pulsation test method is used to analyze the natural vibration characteristic parameters of the bridge.The bearing capacity of the long-span mid-supported tied arch bridge is comprehensively analyzed,and the bridge load test method of the same type structure is provided for reference.