Optimization Design Study of a 32 m Gravel-Incorporated Reactive Powder Concrete Box Girder for High-Speed Railways
To utilize the superior material properties of reactive powder concrete(RPC)incorporating gravel,this study con-ducts an optimization design analysis of a 32 m prestressed RPC box girder for high-speed railways.Accounting for both the compressive and tensile characteristics of gravel-incorporated RPC,a finite element model of the 32 m prestressed RPC box girder was established.The optimization proceeded in accordance with relevant high-speed railway standards and design princi-ples.The results show that,when structural performance requirements are satisfied,the excellent mechanical properties of RPC can be fully exploited to reduce the girder's cross-sectional dimensions.Compared with a conventional C50 prestressed concrete box girder,the self-weight of the RPC girder is reduced by 12.39%,significantly lowering material usage.Furthermore,the optimized RPC box girder satisfies the requirements of current codes in terms of bearing capacity,in-service structural perform-ance,stiffness,and anchorage-zone verification,demonstrating its feasibility and efficiency in high-speed railway applications.Research helps promote the application of RPC materials mixed with gravel in high-speed railway box girders.
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