矩形钢管混凝土桁架Y型受拉节点受力性能分析  

Mechanical Behavior Analysis on Y-Type Tension Joint of Rectangular Concrete-Filled Steel Tube Truss

作　　者：向忠宝 王伟 程高[2] 聂记良 常启忠 

机构地区：[1]中交隧道局第二工程有限公司,陕西西安710100 [2]长安大学公路学院,陕西西安710064

出　　处：《重庆交通大学学报（自然科学版）》2017年第12期1-5,12,共6页Journal of Chongqing Jiaotong University(Natural Science)

基　　金：中央高校基本科研业务费资助项目(310821161004)

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。Taking a rectangular concrete-filled steel tubular truss bridge as an example,the K-type connections were divided into Y-type tension joints and Y-type compression joints. The nonlinear finite element analysis model was established from the most basic Y-type tensile joints. The influence of the parameters such as the concrete filled in the chord and the PBL stiffener on the deformation,failure mode and stress distribution of the joints were analyzed. The results show that filling concrete in steel tube can increase anti-deformation ability and reduce stress level of the joints,but the phenomenon of debonding between the steel pipe and concrete is easy to occur; setting PBL stiffener can effectively increase the bonding force of the interface between steel and concrete,prevent interface debonding,greatly improve the node deformation resistance,obviously decrease the node stress level and effectively improve the ultimate bearing capacity of the node and the node stiffness.

关 键 词：桥梁工程 钢管混凝土 桁架 受拉节点 Y型 极限承载力 有限元分析 

分 类 号：U441.5[建筑科学—桥梁与隧道工程]