摘要
本文把桥梁与车辆视为一个相互作用的系统,以模拟公路桥梁在汽车行驶时的动态性能与反应.该系统中的桥梁结构,理想化为二维的格排梁,可以包括扭转和横向振动等高阶振型的效应.三维的汽车模型,具有竖向位移与纵向摇摆以及横向摇摆的振动自由度,可以有各样的非线性支悬装置与轮胎.该系统的相互作用已完成算法设计与程序编写,并对汽车在桥梁的不同横向位置沿纵向行驶的情形进行了模拟.
The traffic flow in the modern society has increased significantly over time, while increases in road and bridge resources have remained comparatively low. Many older bridges now experience heavier traffic flows than planned for, anp new bridges must have sufficient strength to carry their expected maximum loads without excessive deflections. Therefore, bridge designers require improved analytical techniques. The study reported here considers the bridge and vehicle as an interaction system in which the complex behaviour of highway bridges is subjected to the dynamic influences of vehicles. The bridge superstructure is idealised as a two-dimensional grillage,an advance on a single beam model which cannot account for torsional effects and other higher mode dynamic responses. The vehicle model is three-dimensional with seven degrees of freedom, and is capable of accommodating both roll and pitch, unlike a two-dimensional vehicle model. The new system enables the bridge to be excited by an asymmetric forcing action. The entire procedure for the interaction of the bridge-vehicle system is implemented as an analytical computer package, able to investigate the influences of various parameters which contribute to Hie overall behaviour of a bridge-vehicle system.
出处
《土木工程学报》
EI
CSCD
北大核心
1996年第3期34-42,共9页
China Civil Engineering Journal
