Research On Influence Of Transverse Connection Reinforcement Methods On Mechanical Properties Of Bridge Structures

Transverse connection is an important component of the bridge,it is very important to improve the bridge's overall stiffness,integrity and stability.The transverse stiffness and integrity of the bridge structure will decrease with the failure of the transverse link,resulting in the co-operation between the different beams being destroyed,and the bridge will no longer connected into a common overall structure.Transverse connection completely destroyed or lost will cause the "single beam force" situation,which has a great influence of the bridge.In this paper,through the research and analysis of the structural characteristics,dynamic and static characteristics of multi-tablets highway and two piece railway simply supported girder bridges,a variety of schemes for reinforcement are proposed.Through calculating the static and dynamic characteristics of the two structures and the changes with the different strengthening methods,so as to get the influence of transverse connection on static and dynamic behavior of the bridge structure under different reinforcement methods.The main works are as follows:Firstly,using the finite element analysis software ANSYS to analyze the dynamic and static characteristics of the multi-tablets highway simply supported girder bridge according to the different reinforcement schemes.The transverse connection between the beams is mainly achieved by: 1)pasting the steel and steel plate on the original diaphragm,2)adding steel cross braces between the beams,3)applying lateral prestressing between the beams,4)increasing the steel diaphragm between the beams.Secondly,introducing the basic theory of the lateral distribution of the load of the multi-tablets highway simply supported girder bridge,and deducing the formula of the lateral distribution coefficient of the load by modal parameter method.On this basis,according to the data obtained by ANSYS modal analysis results and the formula of transverse load distribution coefficients,calculating the transverse load distribution coefficient of the original structure and the bridge structure under different reinforcement methods,obtaining the distribution regularity..Finally,taking the railway two piece simply supported beam bridge as the research object.According to the different parameters of the beam in different positions of the beamand the pretightening force,the ANSYS analysis model is established to study the influence of the beam on the natural frequency of the beam.According to the variation of the natural frequency,the effect of the transverse beam and the prestressed reinforcement on the transverse and vertical stiffness of the bridge structure is analyzed and determined.The results show how the reinforcement for the transverse connection of highway multi-tablets beam bridge does the work.By increasing the steel brace and increase steel diaphragm method,the beam transverse stiffness increased,vertical stiffness has a low-loss,while the transverse load distribution coefficient distribution is more uniform,the reinforcement effect is obvious.For the railway two piece simply supported beam bridge,after the reinforcement of the scheme 1,the beam transverse stiffness increased,vertical stiffness has a low-loss,the reinforcement effect is obvious.In this paper,the method of strengthening the transverse connection between the highway and railway and the train of thought can be used as reference for the design of the similar bridge reinforcement scheme.