矩形钢管混凝土桁架Y型受拉节点受力性能分析

发布时间：2018-05-30 02:13

本文选题：桥梁工程 + 钢管混凝土　；参考：《重庆交通大学学报(自然科学版)》2017年12期

【摘要】：以某矩形钢管混凝土桁梁桥为例,将K型节点分解为Y型受拉节点和Y型受压节点,从最基本的Y型受拉节点着手,建立非线性有限元分析模型,分析弦管内填混凝土、设置PBL加劲肋等参数对节点变形、破坏形式及应力分布等的影响。结果表明:内填混凝土能够提高节点抵抗变形能力,降低节点的应力水平,但易出现钢管与混凝土脱粘现象;设置PBL加劲肋后可有效增加钢管与混凝土界面的黏结力,阻止界面脱粘,显著提高节点抵抗变形能力,明显降低节点的应力水平,有效提高节点的极限承载力和节点刚度。
[Abstract]:Taking a rectangular concrete-filled steel tube truss bridge as an example, the K type joint is decomposed into Y type tensile joint and Y type compression joint. The nonlinear finite element analysis model is established from the most basic Y type tensile joint, and the concrete filled in chord is analyzed. The effect of PBL stiffener on the deformation, failure mode and stress distribution of joints. The results show that the inner filled concrete can improve the joint resistance to deformation and reduce the stress level of the joint, but it is easy to occur the phenomenon of steel tube and concrete debonding, and the PBL stiffening rib can effectively increase the bond force between the steel tube and concrete interface. To prevent interface debonding, the ability of resisting deformation of joints is improved, the stress level of joints is obviously reduced, and the ultimate bearing capacity and stiffness of joints are improved effectively.
【作者单位】：中交隧道局第二工程有限公司;长安大学公路学院;
【基金】：中央高校基本科研业务费资助项目(310821161004)
【分类号】：U441

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