文章摘要
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
  
DOI:
中文关键词: 简支梁桥  桥梁动载试验  冲击系数  桥梁基频
英文关键词: simply supported bridge  dynamic load test  impact coefficient  bridge fundamental frequency
基金项目:国家自然科学基金项目(11272119);湖南省教育厅重点项目(12A052)
作者单位
李扬,谢献忠,沈伟成 湖南科技大学 土木工程学院,湖南 湘潭 411201 
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中文摘要:
      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.
英文摘要:
      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 coefficient in the Bridge Specifications was defective. The working condition, bridge fundamental frequency and excitation frequency of entire truck were taken into consideration, then the correcting calculating formulation of impact coefficient was put forward, which was more accurate and verified by the test data of Dengshidu Bridge. The correcting calculating formulation of impact coefficient is effective for improving the Bridge Specifications in the future.
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