下承式钢管混凝土系杆拱桥特殊检测试验方法研究

Research on Special Inspection Test Method of Through Tied-Arc Bridge with Concrete-Filled Steel Tube

以1座服役多年的下承式钢管混凝土系杆拱桥为例,对其进行特殊检测试验方法研究。研究结果表明,桥梁技术状况衰减较为严重;静力荷载卸零后各挠度测点与应变测点的相对残余均满足规范要求,试验荷载满载时,各挠度测点与应变测点实测值均小于理论计算值,校验系数满足规范要求;无障碍行车试验下冲击系数小于理论计算值,说明行车舒适性较好;承载能力检算的结果表明,该桥目前状态能满足设计荷载的通行要求,吊索承载能力满足规范要求。

Taking a through concrete-filled steel tube tie arch bridge which has been in service for many years as an example, this paper researches on the special inspection test method. The results showed that the deterioration of technical condition of this bridge was serious.The relative residue of the deflection points and the strain points met the specification requirements when static load test of bridge was unloaded. And the measured values of every deflection point and every strain point were less than the theoretical value when the test load was full. At the same time, the calibration coefficient met the specification requirements. Impact factor of barrier-free driving test was less than the theoretical value. This suggested that driving comfort was better. Bearing capacity checking results showed that the current condition of this bridge can meet the requirements of design load, and the carrying capacity of the sling meets the specification requirements.