犍为岷江大桥换索前后检测及荷载试验的比较与分析

桥梁实桥检测与荷载试验是评定桥梁结构耐久性、受力性能以及使用性能等的直接方法。犍为岷江大桥换索工程前后的两次检测与荷载试验分别对桥跨结构性能实施鉴定,也验证了换索工程成功地实现了恢复斜拉桥的承载与使用性能。从换索前后的静载试验结果对比,表明换索前索力异常,换索前的检测验证了斜拉索存在严重的病害,两次固有频率的测试结果表明斜拉索病害会明显导致结构固有频率值降低。

Comparison and Analysis of Inspection and Loading Tests Before and After Cable Replacement of Qianwei Minjiang Great Bridge

Inspection and loading tests are the direct methods to evaluate the durability,serviceability and load carrying ability of the bridges.The Minjiang Great Bridge in Qianwei County is inspected and loading tested both before and after the cable replacement to evaluate the performance of the structure,which also demonstrates that cable renewal engineering can successfully rehabilitate the load carrying ability and serviceability of cable-stayed bridges.The comparison of twice loading tests shows that the cable forces before cable replacement are irregular and the detection verifies the damage of the cables.The twice natural vibration frequency shows the damages of cables can obviously decrease the frequency value.