高速铁路32m掺碎石活性粉末超高性能混凝土箱梁优化设计研究
Optimization Design Study of a 32 m Gravel-Incorporated Reactive Powder Concrete Box Girder for High-Speed Railways
张清阳1
作者信息
- 1. 中铁十四局集团房桥有限公司,北京 102412
- 折叠
摘要
基于掺碎石活性粉末混凝土(RPC)材料优异的材料性能,开展高速铁路 32m预应力活性粉末混凝土箱梁优化设计分析.考虑掺碎石RPC材料的抗压和抗拉性能,建立 32m预应力活性粉末混凝土箱梁分析模型,基于高速铁路相关规范和设计原则开展优化分析.在满足结构受力情况下,RPC材料的优良材料性能可在高速铁路 32m箱梁结构中得到充分发挥,从而减小箱梁截面;相比于C50 预应力混凝土箱梁,梁体自重可降低 12.39%,可显著减少材料应用.优化后的 RPC箱梁结构承载力、运营阶段受力性能、刚度和锚固区检算分析,相关指标均满足相关规范要求.有助于推进掺碎石 RPC材料在高速铁路箱梁中的应用.
Abstract
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.
关键词
高速铁路/掺碎石活性粉末混凝土/预应力混凝土梁/优化设计Key words
high-speed railway/reactive powder concrete incorporating gravel/prestressed concrete box girder/optimized design引用本文复制引用
出版年
2025
NETL
NSTL
万方数据