设置垫板的钢结构梁-柱T形件连接节点受力性能分析

发布时间：2018-01-13 08:17

本文关键词：设置垫板的钢结构梁-柱T形件连接节点受力性能分析　出处：《福州大学》2013年硕士论文　论文类型：学位论文

【摘要】：梁、柱之间的连接节点是钢框架结构中的关键部位,传统T形件连接节点的设计思想是在框架梁中形成塑性铰,以此消耗能量,但节点破坏后修复非常困难,且成本较高。为此研究者提出了设置垫板的梁-柱T形件连接节点,该节点是一种新型节点,其主要特点是：将与梁下翼缘相连的T形件作为耗能元件,在T形件翼缘和柱之间设置垫板,使T形件翼缘能向正反两个方向发生弯矩屈服。梁上翼缘作为转动中心不发生较大位移从而保护主体结构不发生破坏,耗能元件位于梁下翼缘,易于更换,便于修复。本文主要研究设置垫板的T形件连接节点在单向和循环加载下的力学性能,主要工作和成果如下：(1)采用有限元软件ABAQUS对相似T形件连接和设置垫板的T形件连接节点进行数值模拟,并与试验结果对比,证明了有限元模型的有效性及适用性,并探讨了此新型连接节点的破坏模式,关键部位的应力分布和发展规律。分析结果表明,设置垫板的下T形件受拉时,节点在下T形件翼缘根部和螺栓中心线处形成塑性铰；受压时,节点在下T形件翼缘根部和垫板边缘处形成塑性铰。破坏时,最大受力和变形均发生在下T形件翼缘根部,其他构件受力相对较小,能保证节点以梁上翼缘为转动中心从而保护主体结构不至破坏。(2)采用ABAQUS软件分析了16个系列共40个设置垫板的T形件连接节点试件的静力性能及滞回性能,研究了各几何参数和物理参数对此新型节点力学性能的影响。计算结果表明：下T形件翼缘厚度、钢梁截面高度和下T形件翼缘上螺栓的竖向间距对设置垫板的梁柱节点初始刚度和承载力影响显著；垫板宽度仅影响此新型连接节点的负向受力性能；上T形件翼缘厚度、钢梁和钢柱翼缘及腹板厚度、螺栓预紧力及直径、摩擦系数等其他因素对设置垫板的新型连接节点的力学性能影响较小。(3)采用组件法,综合考虑了T形件变形(包括T形件翼缘受弯、螺栓受拉、T形件腹板拉伸)、柱腹板变形和柱翼缘变形,提出了适用于此新型梁柱连接节点初始转动刚度的理论计算模型。通过算例验证,证明了该模型的可靠性。最后,对设置垫板的梁-柱T形件连接节点的设计提出了相关建议。
[Abstract]:The connection joint between beam and column is the key part of steel frame structure. The traditional design idea of T-shaped joint is to form plastic hinge in frame beam to consume energy, but it is very difficult to repair the joint after failure. Therefore, a new type of beam-column T-joint is proposed. The main characteristic of the joint is that the T-shaped part connected with the flange of the beam is used as the energy dissipation element. In order to protect the main structure from failure, the flange of the T-shaped piece can be bent to yield in both positive and negative directions by setting a cushion plate between the flange of the T-shaped piece and the column. The upper flange of the beam does not displace as the center of rotation so as to protect the main structure from damage. The energy dissipation element is located at the flange of the beam, which is easy to be replaced and repaired. In this paper, the mechanical properties of T-shaped joint with gasket are studied under unidirectional and cyclic loading. The main work and results are as follows: 1) numerical simulation of T-shaped joint with similar T-shaped parts and T-shaped joints with gasket is carried out by using finite element software ABAQUS, and the results are compared with the experimental results. The validity and applicability of the finite element model are proved, and the failure mode of the new joint, the stress distribution and the development law of the key parts are discussed. The joint forms a plastic hinge at the flange root of the lower T-shaped piece and at the central line of the bolt. Under compression, the joints form plastic hinges at the flange root and the edge of the pad of the lower T-shaped part. During the failure, the maximum force and deformation occur at the root of the flange of the lower T-shaped piece, while the other members are relatively small. It can ensure that the joint takes the upper flange of the beam as the center of rotation so as to protect the main structure from damage. The static and hysteretic properties of 16 series of 40 T-joint specimens with gaskets were analyzed by ABAQUS software. The effects of geometric and physical parameters on the mechanical properties of the new joint are studied. The results show that the flange thickness of the lower T-shaped part is lower. The cross-section height of steel beam and the vertical spacing of bolt on flange of lower T-shaped piece have significant influence on the initial stiffness and bearing capacity of beam-column joint with cushion plate. The width of the pad only affects the negative force performance of the new connection. Flange thickness of upper T-shaped parts, flange and web thickness of steel beam and column, pretightening force and diameter of bolt. The friction coefficient and other factors have little influence on the mechanical properties of the new connection joints with gasket. The component method is used to consider the deformation of T-shaped parts (including flange bending and bolt tension). This paper presents a theoretical calculation model for the initial rotational stiffness of the new beam-column connection joint, which is suitable for T-shaped web tension, column web deformation and column flange deformation. The reliability of the model is proved. Finally, some suggestions are put forward for the design of the beam-column T-shaped joint with cushion plate.
【学位授予单位】：福州大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU391

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