| Currently the construction of a simply supported beam bridge is very popular in the world,its dynamic problems caused concern has been the focus of scholars, this study vibration problems caused by the vehicle simply supported beam bridge.This paper studies the simply supported beam caused by the dynamic load.With the increasing diversity of the vehicle and load,the bridge vibration problems caused by vehicles has aroused widespread attention.Bridgunder repeated dynamic load will cause fatigue and even destroy components,seriously affecting the normal use of the bridge.On the other hand, under the dynamic action,the vibration frequency of the system consisting of the bridge and the vehicle will produce change, so this study with a certain sense of its research projects.To some fators,we take the theoretical calculations,model tests and test a combination of real bridge to study.(1)This article first simply study supported beam bridge coupled vibration theory,then the one vehicle model and two vehicle model are estabished.(2)Based on the previous researches,using MATLAB software to analyze the effects of different factors on the coupled vibration.Take the 16 m, 25 m, 40 m span bridge,The vehicle speed, vehicle weight, factors bridge stiffness, vehicle acceleration and other effects of the impact factor has been the focus of analysis,and analyzed the changes in The frequency of of the vehicle under the action coupled vibration system.The results show these factors have the most important to the vehicle impact factors. The location of the vehicle has the greater impact to the frequency,but its speed was less affected.(3)Using model test the impact shock vibration coupling coefficient were analyzed and compared with the theoretical analysis results are compared.(4)The actual bridge theoretical article provides further validation of the changes under the impact of the coupling coefficient and frequency.This study found that the basic agreement. |
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