中等跨径装配式矩形钢管混凝土组合桁梁桥设计

发布时间：2018-04-18 06:58

本文选题：桥梁工程 + 混凝土箱梁　；参考：《交通运输工程学报》2017年04期

【摘要】：优化了传统混凝土箱梁腹板与底板,提出了装配式桥梁新型结构形式——矩形钢管混凝土组合桁梁桥,从总体设计、主桁选型、横断面选型、桥面板选型、杆件选型、节点选型与连接构造方面介绍了其结构设计优化过程;从桥梁的静力性能与地震响应、桥面板的有效宽度与负弯矩区力学性能方面对矩形钢管混凝土组合桁梁桥进行了有限元分析,并将部分组合技术应用到负弯矩区桥面板连接件的设计中;从技术性与经济性角度将矩形钢管混凝土组合桁梁桥与预应力混凝土箱梁桥进行了工程量和施工便捷性对比。研究结果表明:矩形钢管混凝土组合桁梁桥结构选型符合桥梁预制装配、快速建造的工业化要求,主桁各杆件受力明确,受力形态主要为轴向拉、压力;负弯矩区桥面板有效宽度系数为0.899;采用部分组合技术可使桥面板轴向拉力下降75.3%,有效地提高了桥面板的抗裂性能;矩形钢管混凝土组合桁梁桥初始输入地震力占同等跨度预应力混凝土箱梁桥的58.9%,说明矩形钢管混凝土组合桁梁桥具有良好的抗震性能;钢材用量、混凝土用量、上部结构质量与预应力混凝土箱梁桥的比值分别为1.241、0.485、0.575,说明矩形钢管混凝土组合桁梁桥结构轻巧,材料利用率高,工程造价低,具有经济优势。
[Abstract]:The traditional concrete box girder web plate and bottom plate are optimized, and a new structure form of prefabricated bridge-rectangular steel tube concrete composite truss bridge is put forward. From the overall design, main truss selection, cross section selection, bridge deck type selection, pole type selection,In the aspect of node selection and connection structure, the optimization process of structural design is introduced, and the static performance and seismic response of the bridge are analyzed.The finite element analysis of rectangular concrete-filled steel tube composite truss bridge is carried out in terms of the effective width and the mechanical properties of the negative moment region, and the partial combination technology is applied to the design of the bridge deck joint in the negative moment region.From the point of view of technology and economy, the construction capacity and construction convenience of rectangular concrete-filled steel tube composite truss bridge and prestressed concrete box girder bridge are compared.The results show that the structural selection of rectangular concrete-filled steel tube composite truss bridge conforms to the requirements of prefabricated assembly and rapid construction of the bridge. The main truss members are subjected to explicit force and the main force form is axial tension and pressure.The effective width coefficient of bridge deck in negative bending moment region is 0.899, the axial tensile force of bridge deck can be reduced 75.3 by partial combination technology, and the crack resistance of bridge deck can be improved effectively.The initial input seismic force of rectangular steel tubular concrete composite truss bridge accounts for 58.9% of the same span prestressed concrete box girder bridge, which shows that the rectangular steel tube concrete composite truss bridge has good seismic performance, steel content, concrete content,The ratio of superstructure mass to prestressed concrete box girder bridge is 1.241 ~ 0.485 ~ 0.575respectively, which shows that the structure of rectangular concrete-filled steel tube composite truss bridge is light, the material utilization ratio is high, the engineering cost is low, and it has economic advantages.
【作者单位】：长安大学公路学院;中国市政工程西北设计研究院有限公司;重庆大学土木工程学院;中建钢构有限公司;
【基金】：国家自然科学基金项目(51378068) 国家重点研发计划项目(2016YFC0701202) 甘肃省交通厅科研项目(2016-34)
【分类号】：U442.5

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