新旧桥梁承载能力评定对比研究

基于36座新建桥梁及26座既有旧桥静、动载试验,将其在荷载作用下挠度、应变及振动频率的现场实际值与有限元计算理论值进行对比分析,获取了新旧桥梁的挠度、应变及频率的检验系数,并在此基础上获取了新旧桥梁的承载能力对比情况。结果表明,既有旧桥承载能力下降明显。这将为类似桥梁检测及承载能力评估提供参考。

A Comparative Study on Bearing Capacity Evaluation of New and Old Bridges

Based on the static and dynamic load tests on 36 new bridges and 26 old bridges, a comparison is carried out on the actual measuring value and the finite element theoretical value of the deflection, strain and vibration frequency of these bridges under the load, thus obtaining the inspection coefficient of these bridges’ deflection, strain and frequency, and the bearing capacity comparison of these bridges. As the result shows, a clear decrease is detected in the bearing capacity of the old bridges. It’ s hoped that this study can serve as a reference for detection and bearing capacity evaluations of similar bridge.