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采用活性粉末混凝土取代钢材或轻质混凝土应用于混合梁桥主梁中,在有效减轻结构自重、增大结构跨越能力的同时可避免采用构造复杂的钢-混结合段及目前性能欠佳的轻质混凝土,并能增强结构的耐久性。以一座主跨180 m的普通预应力混凝土连续刚构桥为背景,设计了一座主跨330 m的RPC+C60普通混凝土混合主梁预应力混凝土连续刚构桥,对其局部、整体受力性能及抗震性能进行了分析,并与同等规模的C60混凝土主梁方案进行了对比。结果表明:(RPC+C60)混合主梁方案的局部、整体受力性能及稳定性均满足规范要求;在E1地震作用下结构处于弹性工作状态,E2地震作用下结构变形在合理范围内,满足抗震要求。与C60混凝土主梁方案相比,其上部结构自重可减轻28%,结构活荷载效应比可提高60%。因此,RPC与普通混凝土组合的混合梁桥具备良好的结构性能及实际应用的可行性。
The use of reactive powder concrete instead of steel or lightweight concrete used in the main beam of hybrid beam bridge can effectively reduce the structural self-weight and increase the ability to span the structure while avoiding the use of complex steel-mixed joints and the current poor performance of light Quality concrete, and can enhance the durability of the structure. Based on an ordinary prestressed concrete continuous rigid frame bridge with a span of 180 m, a 330 m main span prestressed concrete continuous rigid frame bridge with RPC + C60 plain concrete beam is designed. Its local and overall mechanical performance And seismic performance were analyzed and compared with the same size C60 concrete girder scheme. The results show that the local and overall mechanical performance and stability of the (RPC + C60) mixed girder scheme satisfy the requirements of the code. The structure is in an elastic working state under the action of E1 earthquake. The structural deformation under the E2 earthquake is within a reasonable range Seismic requirements. Compared with the C60 concrete girder scheme, the weight of the superstructure can be reduced by 28% and the live load effect ratio can be increased by 60%. Therefore, the hybrid beam bridge with RPC and ordinary concrete has good structural performance and feasibility of practical application.