宽幅钢箱梁桥冲击系数研究

Research on the Impact Factor of Wide Steel Girder Bridge

合理的冲击系数取值对桥梁的安全性具有重要的意义。该文以某城市宽幅钢箱梁高架桥为背景,采用与设计荷载等效的车队,研究了此类桥梁冲击系数取值规律,分析了车速、行车位置、阻尼比和路面不平度对桥梁冲击系数的影响。研究结果表明:车辆对此类桥梁的冲击作用在横桥向存在显著的不均匀性,数值模拟得到的冲击系数超过规范取值26%,阻尼比、路面不平度、车速与车辆作用位置的耦合效应对冲击系数有显著影响。

Reasonable impact factor means a lot to the safety margin of bridge. In this papers convoy equaled to de-sign load is adopted to analysis the impact factor of wide steel girder bridges. The influence of vehicle speed, load pori-tion, bridge’s damping ratio, road roughness on the impact factor of bridges is analyzed. The results show that inhomo- gencity of impact in transverse direction exists on such bridges,the impact factor obtained by numerical simulation is 26% more than the value obtained by code, bridge’s damping ratio, road roughness, coupling effect of vehicle speed and load position have significant on the impact factor.