不同工况下冲击系数的理论与试验研究

Theoretic and test research on impact coefficient in different working condition

针对桥梁动载试验时实测的冲击系数较现行规范的计算值偏大的问题,指出现行桥规中冲击系数计算公式的不足.综合考虑不同工况、桥梁基频和车辆激励频率3个因素的影响,提出了比现行规范公式更能准确描述车桥系统动力特性的修正公式,并利用邓氏渡大桥的实测数据进行了验证,其计算精度有了显著的提高.该修正公式可为将来公路桥梁规范的进一步完善提供参考.

The test data of dynamic load of bridge about impact coefficient nowadays was usually much bigger than the one calculated in the Bridge Specifications, which show that the calculating formulation of impact excitation frequen impact coefficient correcting calculating formulation of impact coefficient is effective for improving the Bridge Specifications in the future.