FRP Flexible Piers Anti-collision Pontoon Dovetail Groove Connection Structure Behavior Research

In recent years,designers and the public have been concerned about the safety of bridge-ship collision.Various kinds of anti-collision floating box of piers have been appeared in the actual engineering.Although the material or structure of Anti-collision Floating Boxes can have a great protective effect at the time of receipt of the impact,the floating box volume is generally too large and had to be divided into small pieces to be assembly.This is not only make the installation and transportation more convenient,but also the later maintenance more convenient,Which makes the connection structure of floating boxes must meet the design requirements,In addition,the deformation energy dissipation and late maintenance should be more reasonable.Therefore,taking the FRP bridge-pier flexible anti-collision floating box of Chongqing Jialing River Huanghuayuan-bridge as the engineering background,and the dovetail slot connecting structure as the object.through the combination method of experiment and numerical simulation,this paper studies the stress performance of FRP dovetail groove connection structure,and the conclusion as follows:(1)This paper have understood the structure forms and characteristics of the commonly used flexible anti-collision floating box,proposed the influence of the connection structure for the anti-collision floating box,and introduced it's main connection styles,advantages,disadvantages and Damage form.(2)This paper have completed the basic mechanical performance test of the material of FRP anti-collision floating box dovetail groove structure,and tested the tensile strength,tensile modulus,compressive strength,compressive modulus,flexural strength,flexural modulus parameters and shear strength of the basic mechanical properties of it.(3)According to the static test commonly used experimental scheme of the dovetail groove structure design,It is concluded,whether it is tensile,compression or shear stress,the stress at the corner of the contact point of the structure is the first point to reach the maximum stress.(4)While doing static test,this paper using ANSYS/LS-DYNA to analysis dovetail slot connecting structure.Calculation results show that,compared the stress of all parts of the dovetail groove structure.Among the five load conditions,the stress is the biggest part of the corner in the contact area at the same time.The tension,compression and shear tests be carried out static analysis.Compared with the experimental data,it is similar to the experiment as above.But there has a certain error in the specific numerical value,the reason is that it is difficult to control the distance between the dovetail tenon and groove when do the real test,in addition,using of linear elastic material in the study of FRP composite material may not match the performance of the actual material.there may be a little problem in calculation result of dovetail groove structure.(5)Outside,this paper found that there has a vibration effect when calculated by dynamic analysis.The stress and displacement curve is an increasing vibration curve because of the acceleration changing.In addition to this,The dovetail connecting structure can be able to put most of the energy converted into deformation energy through its deformation when subjected to dynamic loads.In case of tension test and compression test,the horizontal shear force can accelerate the damage of the structure and the increase of the distance between the contact parts.