钢框架腋板加强型节点力学性能研究
发布时间：2018-10-19 15:28
【摘要】：钢框架加强型节点是近几年来国内外专家研究地越来越多的新型梁柱连接节点，其工作原理是在距离梁端柱翼缘表面一定范围内将梁翼缘局部扩大，使钢框架的塑性铰在远离梁柱连接焊缝的梁翼缘上形成，，达到塑性铰外移的设计目的，有效地保护梁柱节点的薄弱部位，提高结构的延性性能，避免发生脆性破坏，实现抗震规范中“强节点弱构件”的设计思想。 本文共设计了四种梁柱腋板加强型节点，分别为梁端上翼缘腋板（带过渡板）腋板加强型节点、梁端下翼缘腋板（带过渡板）加强型节点、梁端下翼缘腋板加强型节点与梁端对称腋板加强型节点。针对此四种不同构造形式的腋板加强型节点开展了ANSYS有限元数值模拟工作，分析对比了四种节点的力学性能，主要内容包括： 1、给出了梁端下翼缘腋板加强型节点计算模型的详细推导过程，分析了腋板几何参数的变化对梁端节点应力分布的影响。 2、针对四种不同构造形式的腋板加强型节点，依据腋板厚度和长度的变化各设计制作了15个缩尺比例为1/2的有限元模型，采用ANSYS有限元分析软件对共计60个节点模型进行了低周循环位移荷载作用下的加载模拟，结果表明四种腋板加强型节点均能够有效地将塑性铰转移到远离梁端的位置，滞回曲线饱满，并且具有较强的延性和耗能能力，满足节点抗震性能的最低标准。 3、随着梁端腋板加强长度的增加，节点的极限承载力、滞回性能和延性性能均有所提高，耗能能力有所降低；腋板厚度的增加对节点的力学性能影响较小。腋板厚度取小于等于梁翼缘厚度即可满足要求。建议梁端上翼缘和梁端下翼缘腋板（带过渡板）加强型节点腋板长度取（0.6~0.8）倍梁高；梁端下翼缘腋板加强型节点腋板长度取（0.7~0.8）倍梁高；梁端对称腋板加强型节点腋板长度取（0.5~0.7）倍梁高；腋板厚度取小于等于梁翼缘厚度。 4、针对有限元模拟结果，对比分析了四种腋板加强型节点的力学性能，得出，梁端下翼缘腋板加强型节点较其他三种节点的承载力有明显降低；梁端对称腋板加强节点较其他三种节点的塑性变形能力有一定程度的降低。
[Abstract]:The steel frame reinforced joint is a new type of Liang Zhu connection which has been studied by experts at home and abroad in recent years. Its working principle is to expand the beam flange within a certain range of distance from the flange surface of the beam end column. The plastic hinge of steel frame is formed on the flange of beam which is far away from Liang Zhu connection weld seam, so as to achieve the design purpose of plastic hinge moving out, effectively protect the weak part of Liang Zhu joint, improve the ductility of structure, and avoid brittle failure. The design idea of "strong joint and weak member" in seismic code is realized. In this paper, four kinds of Liang Zhu axillary plate strengthened joints are designed. They are the upper flange axillary plate (with transition plate), the lower flange axillary plate (with transition plate) of the beam end, and the upper flange axillary plate (with transition plate) node at the end of the beam. The axillary plate reinforced joint at the lower flange of the beam and the symmetrical axillary plate at the end of the beam are strengthened. The ANSYS finite element numerical simulation is carried out for the four kinds of axillary plate reinforced joints, and the mechanical properties of the four joints are analyzed and compared. The main contents are as follows: 1. The detailed derivation of the model of the strengthened node of the axillary plate at the bottom of the beam flange is given. The influence of the geometric parameters of axillary plate on the stress distribution at the end of the beam is analyzed. According to the thickness and length of axillary plate, 15 finite element models with scale ratio of 1 / 2 were designed and fabricated. The loading simulation of 60 node models under low cycle cyclic displacement load was carried out by using ANSYS finite element analysis software. The results show that the four kinds of axillary plate strengthened joints can effectively transfer the plastic hinge to the position far from the beam end, the hysteretic curve is full, and it has strong ductility and energy dissipation ability. The ultimate bearing capacity, hysteretic performance and ductility of the joints are improved with the increase of the stiffening length of the axillary plate at the end of the beam, and the energy dissipation capacity is decreased. The increase of axillary plate thickness has little effect on the mechanical properties of the joints. Axillary plate thickness less than equal to the thickness of beam flange can meet the requirements. It is suggested that the axillary plate length of the upper flange at the end of the beam and the axillary plate (with transition plate) of the lower flange of the beam end should be (0.6 ~ 0.8) times the length of the axillary plate, the length of the axillary plate of the strengthened axillary plate of the lower flange of the beam end should be (0.7 ~ 0.8) times the beam height. The axillary plate length of the symmetrical axillary plate reinforced node at the end of the beam is (0.5 ~ 0.7) times the beam height, and the axillary plate thickness is less than equal to the flange thickness of the beam. 4. According to the finite element simulation results, the mechanical properties of the four kinds of axillary plate strengthened joints are compared and analyzed. The load-carrying capacity of the axillary plate reinforced joints at the bottom of the beam flange is obviously lower than that of the other three joints, and the plastic deformation capacity of the symmetrical axillary plate strengthened joints at the beam end is lower than that of the other three joints to some extent.
【学位授予单位】：青岛理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU391
本文编号：2281550
[Abstract]:The steel frame reinforced joint is a new type of Liang Zhu connection which has been studied by experts at home and abroad in recent years. Its working principle is to expand the beam flange within a certain range of distance from the flange surface of the beam end column. The plastic hinge of steel frame is formed on the flange of beam which is far away from Liang Zhu connection weld seam, so as to achieve the design purpose of plastic hinge moving out, effectively protect the weak part of Liang Zhu joint, improve the ductility of structure, and avoid brittle failure. The design idea of "strong joint and weak member" in seismic code is realized. In this paper, four kinds of Liang Zhu axillary plate strengthened joints are designed. They are the upper flange axillary plate (with transition plate), the lower flange axillary plate (with transition plate) of the beam end, and the upper flange axillary plate (with transition plate) node at the end of the beam. The axillary plate reinforced joint at the lower flange of the beam and the symmetrical axillary plate at the end of the beam are strengthened. The ANSYS finite element numerical simulation is carried out for the four kinds of axillary plate reinforced joints, and the mechanical properties of the four joints are analyzed and compared. The main contents are as follows: 1. The detailed derivation of the model of the strengthened node of the axillary plate at the bottom of the beam flange is given. The influence of the geometric parameters of axillary plate on the stress distribution at the end of the beam is analyzed. According to the thickness and length of axillary plate, 15 finite element models with scale ratio of 1 / 2 were designed and fabricated. The loading simulation of 60 node models under low cycle cyclic displacement load was carried out by using ANSYS finite element analysis software. The results show that the four kinds of axillary plate strengthened joints can effectively transfer the plastic hinge to the position far from the beam end, the hysteretic curve is full, and it has strong ductility and energy dissipation ability. The ultimate bearing capacity, hysteretic performance and ductility of the joints are improved with the increase of the stiffening length of the axillary plate at the end of the beam, and the energy dissipation capacity is decreased. The increase of axillary plate thickness has little effect on the mechanical properties of the joints. Axillary plate thickness less than equal to the thickness of beam flange can meet the requirements. It is suggested that the axillary plate length of the upper flange at the end of the beam and the axillary plate (with transition plate) of the lower flange of the beam end should be (0.6 ~ 0.8) times the length of the axillary plate, the length of the axillary plate of the strengthened axillary plate of the lower flange of the beam end should be (0.7 ~ 0.8) times the beam height. The axillary plate length of the symmetrical axillary plate reinforced node at the end of the beam is (0.5 ~ 0.7) times the beam height, and the axillary plate thickness is less than equal to the flange thickness of the beam. 4. According to the finite element simulation results, the mechanical properties of the four kinds of axillary plate strengthened joints are compared and analyzed. The load-carrying capacity of the axillary plate reinforced joints at the bottom of the beam flange is obviously lower than that of the other three joints, and the plastic deformation capacity of the symmetrical axillary plate strengthened joints at the beam end is lower than that of the other three joints to some extent.
【学位授予单位】：青岛理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU391
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