地震作用下中小跨径空腹式拱桥腹拱病害评价方法改进

Improvement of Evaluation Method for Medium-small Span Hollow Type Arch Bridge Abdomen Arch Disease Under Earthquake Action

现有的公路桥梁技术状况评定标准对空腹式拱桥的病害评价不够具体,对腹拱、立柱出现的病害未进行评价,提高了空腹式拱桥的总体技术状况评定分数及技术状况等级,导致在桥梁维修加固时忽略对腹拱病害进行处理,达不到对桥梁维修加固的预期。为得到更为合理的总体技术状况评定分数及确定技术状况等级,从地震荷载(横向与纵向)方面对比腹拱与主拱的应力计算结果及其比值,得到拱桥腹拱、立柱病害应扣除的更为合理的分数,为空腹式拱桥维修加固提供理论指导。

The existing Standards for Technical Condition Evaluation of Highway Bridges evaluate hollow type arch bridge disease not specifically enough. The disease of abdominal arch and column is not evaluated. In some extent,the general technical condition assessment scores and technical status level of hollow type arch bridge are improved,which resulted in neglecting of ventral arch disease treatment in the bridge maintenance and reinforcement. The expectations for bridge maintenance and reinforcement cannot be reached. In order to get more reasonable general technical condition evaluation scores and determine the technical statues level,from the seismic load（ transverse and longitudinal） aspects the stress calculated results and specific values of abdominal arch and main arch are contrasted,then it is obtained that the arch bridge abdominal arch and column disease should be deducted from the more reasonable fraction,finally the theoretical guidance is provided for the maintenance and reinforcement of open spandrel arch bridge.