Fine Analysis Of Mechanical Properties Of Continuous Girder Bridge With Corrugated Steel Webs During RW Construction

Corrugated steel webs prestressed concrete combined box girder bridge is a new bridge structure,this structure uses corrugated steel plates instead of traditional concrete webs,it solves the problems of traditional prestressed concrete bridges such as web cracking,prestress loss caused by shrinkage and creep,and midspan deflection caused by prestress loss,making this type of bridge construction has been widely used and promoted in domestic bridge construction.According to the structural characteristics of this kind of bridge,the engineering community also put forward a new cantilever pouring construction method-Synchronous dislocation construction methods.This construction method has the characteristics of high efficiency,fast speed,strong practicability and wide application prospects.However,at present,there are few practical projects applying this construction method in the world.However,at present,there is relatively little research on the mechanical performance of the corrugated steel web bridge structure using Synchronous dislocation construction methods in China,Therefore,in order to further understand the characteristics of this construction method and its impact on the bridge structure,it is necessary to carry out detailed analysis and research on the stress of this kind of bridge in the process of synchronous dislocation construction.This thesis takes the cantilever construction process of Zhaojun Yellow River Bridge,a typical long-span continuous beam bridge with corrugated steel webs,as the engineering background,the mechanical properties of the structure during synchronous and ectopic construction are analyzed in detail by using ANSYS software.The main contents include:(1)The zero block of the continuous beam bridge with corrugated steel webs is simulated by ANSYS finite element software,and the stress of the zero block under the maximum cantilever condition,the maximum bending moment condition and the maximum shear force condition in the construction process is calculated and analyzed.The results indicate that the local tensile stresses in block zero are high and that the reinforcement rate needs to be strengthened locally in block zero.(2)The prestressing anchorage zone model was established using ANSYS software,including the anchorage zone of the transverse diaphragm at the top of the main pier,the anchorage zone of the transition pier and the anchorage zone of the toothed plate,and the stress distribution law under the action of the prestressing steel beam was calculated and analysed and verified to prove the safety of the structure.(3)Simulation of the synchronous dislocation construction process of a continuous girder bridge with corrugated steel webs using ANSYS,calculation and comparative analysis of the effect of considering and not considering wet weight on the displacements in each construction phase,and comparison of the two displacement results with the measured displacement,the results show that the simulation with wet weight is more realistic;analysis and summary of the top and bottom plate stress variation law in each construction stage and the waveform steel web shear stress variation law.The conclusions and results obtained can be used as a reference for the design and construction of bridges of the same type.