Y形和X形CR直接焊接节点滞回性能有限元分析

发布时间：2018-02-23 20:22

本文关键词： Y形CR节点 X形CR节点滞回性能有限元分析　出处：《哈尔滨工业大学》2011年硕士论文　论文类型：学位论文

【摘要】：在建筑结构中,空心钢管以其优美的外形和合理的受力性能在会展中心、机场航站楼、火车站等大型建筑中得到了广泛的应用。近年来地震灾害频繁发生,给世界各国造成了巨大的生命和财产损失。为应对地震灾害,学者们提出了基于性能的抗震设计理论,这一理论在世界各国得到了普遍认同,是未来抗震设计的发展方向。基于性能的抗震设计理论首先要求对梁、柱、节点等的抗震性能进行评估,然后再对结构的整体抗震性能进行综合评价。然而在管节点性能方面,国内外的研究多限于静力性能,对节点在往复荷载作用下滞回性能的研究开展较少,尤其在CR节点的滞回性能方面至今还没有涉及。据此,本文应用ANSYS有限元程序,采用典型模型和大量参数分析相结合的方法,对Y形和X形CR节点的滞回性能进行数值模拟分析。典型节点分析时,确定有限元分析的一些影响因素,如焊缝、边界条件等。参数分析时,找到节点滞回性能在几何参数变化、材料参数变化以及弦杆预加轴力等情况下的变化规律,并通过节点的滞回曲线、骨架曲线、滞回环面积和能量耗散系数等评价指标对Y形和X形CR节点的抗震性能进行综合评估。本文将Y形CR节点分别与相应的T形CR节点、Y形RR节点以及X形CR节点进行了对比,对几种节点的滞回性能进行了比较评价。本文还对Y形CR节点的数值结果和足尺试件的拟静力试验结果进行了对比,验证了应用ANSYS有限元程序进行管节点在往复荷载作用下力学性能研究的可行性。除此,本文通过大量有限元计算结果,对Y形CR节点与对应的Y形RR节点承载力关系进行研究,数值回归了两者承载力比值的函数表达式,为完善Y形CR节点的工程设计提供了一些有益参考。
[Abstract]:Hollow steel tubes are widely used in large buildings such as convention and exhibition center, airport terminal, railway station and so on because of their beautiful shape and reasonable mechanical properties. In recent years, earthquake disasters occur frequently. In order to deal with the earthquake disaster, scholars put forward the performance-based seismic design theory, which is generally accepted in the world. The theory of performance-based seismic design requires the evaluation of seismic performance of beams, columns and joints, and then the comprehensive evaluation of the overall seismic performance of the structure. Most of the researches at home and abroad are limited to static performance. There are few researches on the hysteretic performance of joints under reciprocating load, especially on the hysteretic performance of CR joints. Therefore, the hysteretic performance of Y-shaped and X-shaped CR joints is numerically simulated by using the ANSYS finite element program, using a typical model and a large number of parameter analysis methods. Some influencing factors of finite element analysis, such as weld seam and boundary condition, are determined. When parameter analysis is carried out, the variation of hysteretic performance of joints under geometric parameters, material parameters and pre-axial force of chord is found. The seismic performance of Y-shaped and X-shaped CR joints is evaluated by hysteretic curve, skeleton curve, hysteresis loop area and energy dissipation coefficient. In this paper, the Y-shaped CR node is compared with the corresponding T-shaped CR node, the Y-shaped RR node and the X-shaped CR node, respectively. The hysteretic performance of several joints is compared and evaluated. The numerical results of Y-shaped CR joints are compared with the quasi-static test results of full-scale specimens. The feasibility of using ANSYS finite element program to study the mechanical properties of pipe joints under reciprocating load is verified. In addition, the bearing capacity relationship between Y CR joints and corresponding Y RR joints is studied by a large number of finite element calculation results. The function expression of the ratio of the bearing capacity of the two is regressed, which provides some useful references for the improvement of the engineering design of Y-shaped CR joints.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TU392.3

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