多跨连续桥梁位移响应的动态影响线方法研究

Study of dynamic influence line on displacement response of multi-span continuous bridge

为了提高桥梁结构健康监测系统的运行效率,真正实现针对问题结构的实时评价,提出了多跨连续桥梁响应求解的动态影响线方法。结合传统准静态影响线的定义,将影响线的概念扩展到动态影响线范围,利用有限元软件强大的模态分析功能,在准确获取振型函数的基础上,实现对多跨连续桥梁结构的动力响应求解。通过数值模拟,验证了桥梁动态位移影响线求解的准确性,为进一步的应用做好准备。

In order to enhance the efficiency of bridge healthy monitoring system and realize the real - time e- valuation to the problem structure. The dynamic influence line method （DILM） was employed into the re- sponse calculation of multi- span continuous bridge. The DILM was born from traditional quasi -static influ- ence line and developed to dynamic fields. Dynamic response of the bridge can be acquired based on accuracy vibration mode of the bridge with finite element software. The accuracy of the proposed DILM was verified from a set of numerical simulations and it makes preparation for engineering application.