单箱多室钢箱梁桥静动载试验分析与研究

ANALYSIS AND RESEARCH ON STATIC AND DYNAMIC LOAD TEST OF SINGLE BOX AND MULTI-COMPARTMENT STEEL BOX GIRDER BRIDGE

为了确保鹤岗市某钢箱梁桥的正常使用,也为了探讨寒区钢箱梁桥的检测方法,对该桥进行动静载试验之后,对比设计活载与试验活载产生的效应值,讨论试验效果是否能达到设计要求,采用MIDAS-civil有限元计算软件对该桥进行建模计算,确定加载方案、挠度、应变、基频等的理论值,并计算设计荷载下的理论值。经过试验后,实测挠度最大值为10.3mm,小于规范值(L/500)。各个工况的实测应变值小于理论计算值,计算的一阶自振频率为3.13Hz,大于计算值2.34Hz,试验荷载与设计活载产生的效应值相近,说明该桥荷载试验满足设计活载的要求,可知该桥承载能力满足设计要求。

In order to ensure the normal use of a steel box girder bridge in Hegang City, and to explore the detection method of steel box girder bridge in cold regions, dynamic and static load tests are carried out on the bridge.Then, the effects of design live load and test live load are compared, and whether the test results can meet the design requirements are discussed. The MIDAS-civil finite element software is used to calculate the bridge. The theoretical values of loading scheme, deflection, strain and fundamental frequency are determined by modeling calculation, and the theoretical values under design load are calculated. After the test, the maximum measured deflection is10.3 mm, which is less than the standard value(L/500). The measured strain values of each working condition are less than those of theoretical calculation. The calculated first-order natural frequency is 3.13 Hz,exceeding the calculated value 2.34 Hz. The effect values of test load and design live load are similar. It shows that the load test of the bridge meets the design live load requirements. The results show that the bearing capacity of the bridge meets the design requirements.