Study On Structural Optimization And Performance Of The Modulus Expansion Device With Multidirectional Variation In Bridge

With the rapid development of our country’s highway and urban viaduct construction,the number of the bridge is increasing.The breakthrough and innovation of various combination bridge type and large span bridge constantly refresh the demand of bridge expansion device.In order to meet the demand of the telescopic device to expand the deformation of the girder in many directions,it is very important to carry out corresponding research on the bridge expansion device.The bridge expansion device due to the design,processing technology,and inadequate curing on construction quality and management,lead to this kind of telescopic device cannot meet the requirements of horizontal and vertical displacement loss,noise,distortion,jump car expansion joint block.Taking into account what has been argued,a new type of multi-directional displacement modulus expansion device is developed for the problem of unstable steel material,failure of anchorage and uniformity.Through the finite element numerical simulation,laboratory test and field engineering application,this paper further studies the new bridge multidirectional displacement module type expansion device.The main research work is as follows:Firstly,it has developed the bridge modulus expansion device with multidirectional variation.Based on the analysis of the disease of the existing bridge expansion device and the working principle of the telescopic device,a new type of bridge modulus expansion device with multidirectional variation is proposed.Compared with the conventional modular expansion device,it has the waterproof adhesive structure of the supporting platform,and the waterproof,anti-dust and anti-carstone effect is good.It has good displacement control effect and durability.The concave and convex surface of the support beam roof,bottom and side plate has good vertical Angle adaption.Double-layer waterproof measures to ensure the waterproof performance of the expansion joints;Good economic performance.Secondly,structural optimization of bridge multidirectional displacement modular expansion device.Through the finite element simulation model,the elastic element form and size of the telescopic device and the connection mode of anchor end are optimized.A finite element model of elastic element was established by using elastic element,and the shape and dimension of elastic element were optimized,and the elastic element of 12mm thick was determined.By comparing the maximum scale,vertical displacement,lateral displacement,vertical displacement of the presence of the rotation system under the condition of telescopic device uniformity,discovered that these two system can satisfy the displacement uniformity.A simple bridge modulus expansion device with multidirectional variation without rotation system was eventually adopted.Thirdly,study on the structural performance of the bridge multidirectional displacement module.Through the finite element simulation,the static and dynamic properties of the expansion device are studied,the main centre sill and beams for the telescopic device on the strength and stiffness,results show that the centre sill and the deflection of beams and equivalent stress meet the requirements.The dynamic characteristics and dynamic response of the telescopic device are studied.Fourthly,study on the work performance of the new bridge modulus expansion device with multidirectional variation.Carried out experimental study on deformation uniformity of telescopic device,relying on xiamen BRT maintenance engineering,collecting relevant data,test and engineering application results show that the new type of the bridge modulus expansion device with multidirectional variation on the displacement uniformity and noise requirements can meet the requirements.