【作者】 高波；

【导师】 范文理；

【作者基本信息】 西南交通大学 ， 桥梁与隧道工程， 2003， 硕士

【摘要】 目前，钢管混凝土结构在桥梁中获得了广泛的应用，其中对钢管混凝土拱桥安全至关重要的是管节点的疲劳寿命。至今对此尚无类似结构可借鉴，理论上求解还有困难。本文研究的背景为正在兴建的巫山长江大桥，研究的主要内容为DY型管节点的静力行为以及验证在设计载荷下节点相贯焊连接的疲劳寿命。课题采用理论计算与模型试验相结合的研究方法。理论计算部分采用通用有限元软件ANSYS，分别对空心管节点及钢管混凝土节点进行计算，推求热点应力及应力集中系数。试验方案由静载试验和疲劳试验两个部分组成，通过静力试验，实测节点的热点应力，将计算值与实测值比较，分析两者之间差别。疲劳试验按设计名义应力幅进行，对试验结果进行分析评价后，证实了巫山长江大桥的节点疲劳不控制设计。更多还原

【Abstract】 Presently, the concrete-filled steel tubular structure is applied widely in bridge engineering. All in all, the most important is to estimate the fatigue life of the joints on the concrete-filled steel tube arch bridges. However, there is not similar structure for reference now, and it’s difficult to resolve in theory. The study object of this paper is the Wushan Yangtze Bridge that is in construction, and the purpose is to analyze the static behavior on the tubular DY-joints and validate the fatigue life on the tubular joints under the design load. The study method is to combine theory calculation with model test. In the part of theory calculation, utilize general FEM software ANSYS, calculate the tubular joints and concrete-filled steel tubular joints respectively, then summarize the hotspot location and the SCF of joints. The experimentation is separated into two parts, one is static-load test, and another is fatigue test. Based on the outcome of the static-load test, achieve the hotspot stress and the SCF, then compare the value that is calculated with the value from test, analyze the difference between them. The fatigue test is based on nominal stress range. At the last, analyzing and estimating the outcome, testified that fatigue intensity is not dominant in the process of designing the Wushan Yangtze Bridge.更多还原