Research On The Fall Prevention Beam Of The Shudao Bridge

In recent days, the Ramp Bridge of the free way's exit in Heyuan City, which is located in the south part of Guangdong Province, collapsed, and the casualties it caused left people heavy mental hurt. As economic rapid development, the traffic increase accordingly and overload does not stop despite of repeated prohibition, what's more, the phenomenon of many carts and trucks running on the same side of the road is quite common. According to the recent design theory of roads and bridges, it can be counted as small probability event; however, as China's rapid increase in traffic, the probability might increase greatly. It is necessary for traffic section to establish a better system of operation; meanwhile, we should analyze the factors of the unseating Ramp Bridge and discuss on the reinforcement measures of curving bridges to promote industrial leading departments to make more appropriate design specification in accordance with the reasons of bridge's accident. In this case, all engineers will make more appropriate engineering design to avoid similar accidents' occurrence.After analyzing ramp bridge's development and research situation, and combining with the accidents of unseating bridge in recent years, this paper analyzes the theories of Ramp Bridge's force characteristics and variable differential equation; meanwhile, it points out that cart's loading makes Ramp Bridge displace laterally. By analyzing the characteristics of cart loading and its accumulation in respect of Ramp Bridge's lateral displacement, the author emphasizes the impact of car's overloading on Ramp Bridge.Combining with projects' instances, and applying finite element programming to carry out simulation analysis on ADINA, the author does some simulation calculations on the loading, eccentric loading position and traveling concentration of the cars and finds out the unseating critical value of the relevant bridge's beams' internal supporters. At last, the author arrives at a conclusion that the average force that engendered by supports does not exceed skid residence's stable critical value of various plate-type's supporters. The author also analyzes that unbalanced force bearing produces different deformation accumulations between the supporters' outer and insider sides, which makes supporters become “inclined”. What the engineers need to do is to adjust supporters' installation and optimize structures' force bearing.At last, the author discusses that the Ramp Bridge's anti-drop-beam cannot be completed only by studying the bridge's structure, meanwhile, he puts forward the corresponding reinforcement measures: build more anti-torsional bearings, eblish lstaateral elastic supporters, pay attention to supporters' transversal arrangement and add more supporters. What's more, after focusing on Ramp Bridges' simulation analysis in respect of adding anti-torsional, the author puts forward the appropriate scheme. He also suggests that the outer loading of the Ramp Bridge should be prevented and treated. After discussing the Ramp Bridge's unseating, the author brings forward relevant measures of prevention and treatment.