不同比例外接式钢-混凝土组合桁架节点的研究  

Study on Steel-concrete Composite Joints with Two Kinds of Scale

作　　者：周凌宇[1] 贺桂超[1] 

机构地区：[1]中南大学土木工程学院,湖南长沙410075

出　　处：《四川大学学报（工程科学版）》2012年第2期9-15,共7页Journal of Sichuan University (Engineering Science Edition)

基　　金：国家自然科学基金资助项目(50708112);铁道部科技研究开发计划项目(2008G007-C)

摘　　要：为研究钢-混凝土组合桁架节点的破坏模式和极限承载力,对比例为1∶2和1∶3的节点缩尺模型进行了单调静力水平加载试验,对比了不同比例模型的受力性能、极限承载力和破坏模式,得出了影响节点力学性能的因素。试验结果显示,节点的失效模式可能有:混凝土开裂破坏,节点板受压屈曲和撕裂破坏。应用有限元软件ANSYS对试件进行数值模拟分析,与试验结果吻合良好,对比不同的有限元分析结果,明确了不同比例节点的薄弱部位。为实际工程和类似工程节点设计提供试验参考和理论依据。The monotonous static horizontal load experiment was carried out on 1∶2 and 1∶3 scale joints model to investigate the failure mode and ultimate bearing capacity of steel-concrete composite truss joints.The behavior of loading process,the comparison of the ultimate bearing capacity and failure mode were presented in detail,and the factors that influence the mechanical behavior of joints were found.The experimental results showed that failure mechanisms include the cracking mode of concrete,compression buckling and tear destroy of plate.The ANSYS software was used to analyze the specimens,and the results were in good agreement with the tests.The result of comparison with finite element showed the weak parts of different scale joints and how to effectively improve the bearing capacity.Test results can provide reference and theoretical basis for the similar projects on the joint design.

关 键 词：桥梁工程 钢-混凝土组合节点 缩尺模型 有限元分析 

分 类 号：TU448.21[建筑科学—岩土工程] TU317.1[建筑科学—土工工程]