城市道路桥梁的疲劳荷载谱

我国针对公路及城市道路桥梁疲劳设计的车辆荷载谱还是个空白,本文以上海市内环线中山路3号桥地面道路桥梁为例,对城市道路桥梁的疲劳荷载作了研讨.在1994年和1995年两次交通调查的基础上,得到了由18类日常典型的运营车辆组成的荷载频值谱.依据等效的疲劳损伤原理,将实测的车辆荷载频值谱简化成由6类模型车辆组成的具有实用性的荷载频值谱.所建立的模型车辆荷载频值谱,对于日常车辆交通构成与本文状况相类似的其它城市道路桥梁的疲劳损伤度验算,可作为参考.

FATIGUE LOAD SPECTRUM FOR URBAN ROAD BRIDGES

There is no vehicle load spectrum for fatigue design of highway bridges and urban road bridges in China. In this paper the fatigue load for urban road bridges is discussed, in which the No. 3 ground bridge of Zhong Shan road of Shanghai Inner Ring Road is taken as an example. The load frequency spectrum composed of eighteen types of daily transport vehicles is obtained on the basis of traffic surveys in 1931 and 1995. This observed load frequency spectrum is simplified into a practical one composed of six types of model vehicles based on the principle of equivalent fatigue damage. The latter load frequency spectrum can be used for fatigue assessment of other urban road bridges on which the components of daily vehicle traffic are similar to those presented in this paper.