Optimization Research on Reinforcement Technology of Double-column Piers of Heavy Haul Railway
In order to explore the optimal design method of bridge pier reinforcement based on per-formance improvement,this paper takes a large number of separated double-column piers in heavy haul railway as the object.Based on the numerical simulation analysis and the operation performance test of bridge pier reinforcement,the static performance comparison analysis and dynamic performance compar-ison test of bridge piers under the reinforcement conditions of three common methods are carried out,and the reinforcement technology optimization research is carried out.The results show that under the design load,the reinforcement of the pier body has a good effect on suppressing the horizontal displace-ment of the pier top,while the combined reinforcement of"increasing the foundation and supplementing the pile foundation"can effectively reduce the stress of the base section.Under the action of operating trains,the lateral amplitude of the pier top of the three methods of reinforcement conditions is reduced to varying degrees compared with that before reinforcement,but some piers are affected by construction and other factors,and the amplitude increases.The optimized triple reinforcement method of"increas-ing foundation + adding pile foundation + pier body outsourcing"is adopted,and the lateral amplitude of pier top is reduced by more than 50%,which can well meet the needs of strengthening and recon-struction of double-column piers of heavy haul railway.
heavy haul railwaydouble-column piersreinforcement technologynumerical simula-tionfield testoptimization design
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