Double-composite Rectangular Truss Bridge and Its Joint Analysis
Double-composite Rectangular Truss Bridge and Its Joint Analysis
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DOI：
10.1016/j.jtte.2015.05.005
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发表时间：
2015-08
影响因子：
--
通讯作者：
L. Yongjian;Z. Xiong;Luo Ya-lin;Gao Cheng;Liu Ge;Jian Yang
中科院分区：
文献类型：
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作者：
L. Yongjian;Z. Xiong;Luo Ya-lin;Gao Cheng;Liu Ge;Jian Yang
本文介绍了一种新型的混凝土板-矩形弦杆组合钢管桁架桥。采用混凝土板+桁架体系，节点用混凝土和Perfobond Leiste肋加固，双组合桁架桥在负弯矩区是一种比较合适的解决方案。Perfobond Leiste剪力连接件(PBL)以其优异的抗疲劳性能在复合材料结构中得到了广泛的应用。在这座试验桥中，在桁架梁的节点处安装了Perfobond Leister肋(PBR)，起到了剪力连接件和加劲板的双重作用。在此基础上，给出了架设方法和整体结构分析。选取试验桥的典型节点，分析了PBR的作用效果。阐述了PBR在钢管混凝土节点中的作用。对比表明，带PBR的钢管混凝土节点比不带PBR的节点具有更高的约束能力。对于矩形钢管桁架，带PBR的混凝土节点的冲切剪力比不带PBR的节点的冲切剪力大约43%。通过对节点应力集中系数的分析，发现安装PBR后节点的疲劳性能得到了改善。安装在节点上的PBR减轻了弦面的应力集中系数。论证了这种新型桥梁的优点：采用矩形桁架施工方便，结构设计理念新颖，具有较好的整体和局部性能。
This paper describes a novel composite tubular truss bridge with concrete slab and concrete-filled rectangular chords. With concrete slab plus truss system and joints reinforced with concrete and Perfobond Leiste rib, double composite truss bridge proved to be a fairly suitable solution in negative moment area. Perfobond Leiste shear connector (PBL) is widely implemented in the composite structure for its outstanding fatigue resistance. In this pilot bridge, Perfobond Leister ribs (PBR) were installed in the truss girder's joints, which played double roles as shear connector and stiffener. An erection method and overall bridge structural analysis were then presented. Typical joints in the pilot bridge were selected to analyze the effect of PBR. Investigation of the effect of PBR in concrete-filled tubular joints was elaborated. Comparison has revealed that concrete-filled tubular joints with PBR have much higher constraint capability than joints without PBR. For rectangular tubular truss, the punching shear force of the concrete filled joint with PBR is approximately 43% larger than that of the joint without PBR. Fatigue performance of the joint installed with PBR was improved, which was found through analysis of the stress concentration factor of joint. The PBR installed in the joints mitigated the stress concentration factor in the chord face. Therefore, the advantages of this new type of bridge are demonstrated, including the convenience of construction using rectangular truss, innovative concept of structural design and better global and local performances.