大跨活性粉末混凝土混合梁连续刚构桥的结构性能

发布时间：2018-07-03 08:43

本文选题：桥梁工程 + 混合梁桥　；参考：《公路交通科技》2016年07期

【摘要】：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。
[Abstract]:The use of reactive powder concrete instead of steel or lightweight concrete in the main girder of hybrid beam bridge can effectively reduce the structural weight. Increasing the span capacity of the structure can avoid the use of complex steel-concrete composite section and light concrete with poor performance at present, and can enhance the durability of the structure. Based on a normal prestressed concrete continuous rigid frame bridge with a main span of 180 m, a 330m RPCC60 prestressed concrete continuous rigid frame bridge with 330m main span is designed. The overall mechanical performance and seismic performance are analyzed and compared with the C60 concrete main beam scheme of the same size. The results show that: (RPC C60) hybrid beam scheme meets the requirements of the code for local mechanical properties and stability, and the deformation of the structure under E _ 2 earthquake is in a reasonable range, which meets the requirements of earthquake resistance. Compared with the C60 concrete main beam scheme, the self-weight of the superstructure can be reduced by 28%, and the live load ratio of the structure can be increased by 60. Therefore, the hybrid beam bridge combined with RPC and ordinary concrete has good structural performance and practical feasibility.
【作者单位】：湖南大学土木工程学院;
【基金】：教育部博士点基金项目(20120161110021)
【分类号】：U441;U448.23

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