Static Test Study Of Small Radius Curved Rigid Frame Bridge With Double-limb Pier With Gap

With the development of urban elevated and high-speed ramps,Curve Bridge has become a very popular bridge type.The type of bridge has a large difference in the inner and outer arc lengths of the curve,a lateral asymmetry of the structure and a significant bending-torsional coupling effect,resulting in serious uneven lateral force and even a roll accident.Aiming at some problems such as bearing voiding,box beam traverse and roll in the concrete curved box girder bridge in expressway and urban ramp,the structural system of small radius curved rigid frame bridge with double-limb pier is research and trial designed,The structural system can effectively solve the aforementioned problems by eliminating the support of the pier and the consolidation of the beam pier.At the same time,the structural system also has the advantages of good integrity,favorable structure earthquake resistance,and beautify of urban bridges.The overturning problem of the curved bridge can also be solved completely by beam pier consolidation.The main research and achievements of this paper are as follows:1)Using the software Midas Civil/2017,the finite element model of the small radius curved rigid frame bridge with double-limb pier was established,and four construction stages and nine load cases were considered.Through the combination of loads,the most unfavorable working conditions are obtained.According to the requirements of highway and urban bridges,the limit state of the control section of the main girder and pier of the bridge and the normal use limit state are checked.The results of the check indicate that the joints have small radius.The new system of curved rigid frame bridges is a reasonable and feasible structural system.2)A 1:30 model of a small-radius curved rigid-frame bridge with double-limb pier was fabricated by using similar principles of plexiglass.The static loading test was used to study the spatial force performance and deformation law of the structural system.At the same time,the software ABAQUS was used.A solid element model of a small radius curve rigid frame bridge with double-limb pier is established.The results show that the experimental values of the model are basically consistent with the theoretical values of the finite element analysis results.The reliability of the test values and the results of the finite element analysis was confirmed.3)Under the static load,the shear lag effect has great influence on the longitudinal and transverse stresses of the main girder of the model curved box girder bridge.Under the same load condition,due to the consolidation of the mid-span beam pier,the mid-span section stress is more uniform than the side-span section stress.The software ABAQUS is used to establish the finite element model of the rigid frame bridge rigid element with different radius.The analysis results show that the smaller the radius,the more uneven the force of the curve bridge.At the same time,the spatial stress distribution law of the rigid-frame bridge with small radius curve is proposed.4)Two parameters of the width of the pier and the arrangement of the side supports are selected respectively.The finite element model under different parameters is established by Midas Civil.The reaction of the side bearing and the stress of the pier are analyzed.The parameters of the structure are summarized.The internal force influences the law and can provide reference for engineering applications.