内蒙古尼尔基大桥动力特性试验研究

Dynamic Property Research for Nierji Bridge in Inner Mongolia

在不同速度的正常行车、跳车、刹车荷载作用下,对内蒙古尼尔基大桥进行了动力反应实桥测试;在夜间进行了此桥的大地脉动反应测试;并利用有限元程序ANSYS进行了建模和计算分析,实测与理论的结果差别不大。获得了大桥固有频率和模态、动力荷载作用下的冲击系数,了解了该桥在建成后的工作状态和安全承载能力。

A serious of forced vibration tests were carried out to evaluate the dynamic amplification factor(DAF) on the Nierji bridge,a 800?m continuous beam structure in Inner Mongolia Autonomous Region,ChinaAs the test vehicle,a 40?ton truck completed three different runs: normal running,crossing obstacle,sudden brakingEach run was at different speeds from 20 to 50 km/hThe seismic pulse response tests were performed at night to acquire the natural frequency and vibration modesA three dimensional finite element model of the bridge was built through ANSYS program to analysis the theoretical dynamic propertiesThis paper discusses the experimental procedure with comparison made between the measured and calculated valuesThe dynamic bearing capacity and working state under normal traffic conditions can be known