活性粉末混凝土在大跨径空腹式刚构桥中的应用研究  

Research on Application of RPC in Large Span Hollow Rigid Frame Bridge

作　　者：令狐垚 王学敏 刘建军[2] LING HU-Yao;WANG Xue-min;LIUJian-jun(School of Civil Engineering,Guizhou University,Guizhou 550025,China;Guizhou Transportation Planning Survey and Design Academe Co.Ltd.,Guizhou 550025,China)

机构地区：[1]贵州大学土木工程学院,贵阳市550025 [2]贵州省交通规划勘察设计研究院股份有限公司,贵阳市550025

出　　处：《公路》2022年第8期142-146,共5页Highway

摘　　要：活性粉末混凝土(RPC)是一种高强度、高韧性、低孔隙率的超高性能混凝土,其应用于大跨径桥梁具有一定的优势。以贵州某在建三跨预应力混凝土空腹式连续刚构桥为工程实例,用RPC代替原设计中用于箱梁的普通混凝土,同时对结构进行优化设计,通过有限元计算对结构的应力、变形进行分析,研究RPC材料在大跨梁式桥中的应用效果。计算结果表明,RPC方案能满足规范在受力、变形方面的要求,其材料用量更少,活载效应比也比普通混凝土方案有明显提高。结果表明,RPC材料在梁桥的实际应用上具有良好的可行性。Reactive powder concrete is an ultra-high performance concrete with high strength, high toughness and low porosity, and it application in long-span bridges has certain advantages. In this paper, a three-span prestressed concrete hollow continuous rigid frame bridge under construction in Guizhou is taken as practice background, the ordinary concrete of box girder in the original design is replaced with RPC, the design of the structure is optimized at the same time, the stress and deformation of the structure are analyzed through finite element calculation, and the application effect of RPC material in long-span girder bridges is studied. The calculation results show that the RPC scheme can meet the requirements of the specification in terms of force and deformation, its material consumption is less, and the live load effect ratio is significantly higher than that of the ordinary concrete scheme. It can be seen that RPC materials have good feasibility in the practical application of beam bridges.

关 键 词：空腹式连续刚构桥 活性粉末混凝土 结构轻型化 有限元计算 应用研究 

分 类 号：U448.23[建筑科学—桥梁与隧道工程] U445.471[交通运输工程—道路与铁道工程]