装配式钢管内套筒-T型件梁柱连接节点力学性能分析

发布时间：2018-02-02 21:33

本文关键词： 钢管内套筒梁柱节点滞回性能耗能能力 T型件　出处：《青岛理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：近年来,由于矩形钢管柱具有截面惯性矩大、整体稳定性好、便于施工等优点,得到了越来越广泛地应用,通常矩形钢管柱与H型钢梁采用焊接连接,但焊接连接易发生脆断、且焊缝质量受施工条件影响,因此能够大幅减少现场施焊工作量的装配式连接形式逐渐得到了人们的重视。目前矩形钢管柱与钢梁多采用套筒进行装配式连接,而国内外专家已对外套筒连接形式做了大量研究,但对具有建筑立面造型美观、施工周期短等优点的内套筒连接节点研究较少,因此对内套筒连接节点受力情况的研究是十分必要的。本文基于上述考虑,利用ANSYS有限元软件建立钢管内套筒-T型件梁柱连接节点模型,观察边柱节点在梁端位移循环荷载作用下的破坏形式,对其表现出的滞回性能、骨架曲线和承载力、耗能能力等力学性能进行分析。并通过分别改变钢管内套筒的厚度和长度,研究内套筒几何参数的变化对节点连接件应力分布的影响,最后结合工程实例,对该种节点在钢框架中的受力进行设计和验算。研究结果表明:在往复荷载作用下,钢管内套筒-T型件梁柱连接节点表现出良好的滞回性能,试件滞回曲线呈“弓”型,位移加载过程中由于高强度螺栓滑移影响,试件的滞回曲线存在一定程度地“捏缩”现象,最终由于T型连接件翼缘产生较大塑性变形,导致节点破坏;随钢管内套筒厚度增加,节点刚度增大,试件的滞回性能提升明显,屈服承载力和极限承载力也随之增加,在往复荷载作用下对动能的消耗能力有所增强,高强度对拉螺栓的拉力值逐渐增大,T型件塑性变形减小,内套筒与T型件的应力水平呈现降低趋势;随钢管内套筒长度增加,高强度对拉螺栓竖向间距增大,对T型件的约束作用减弱,造成T型件翼缘中部弯曲变形和端部翘曲变形,塑性变形增大,应力值减小,试件的屈服承载力和极限承载力均有所降低,节点的变形能力增大,对动能的消耗能力降低,因此建议在满足连接要求的前提下,内套筒长度尽量减小,厚度大于外柱壁2mm,此时节点用料经济且力学性能较好。通过验算,该种节点形式可以有效地将梁端荷载传递给柱子,受力安全可靠。
[Abstract]:In recent years, rectangular steel tube column has been more and more widely used because of its large moment of inertia, good overall stability, easy construction and so on. Usually, welded connection between rectangular steel tube column and H-shaped steel beam is adopted. However, the welded joints are prone to brittle fracture, and the quality of the weld is affected by the construction conditions. Therefore, people pay more and more attention to the assembly connection which can greatly reduce the workloads of welding on the spot. At present, most of the rectangular steel pipe columns and steel beams are assembled by sleeve. Experts at home and abroad have done a lot of research on the form of external sleeve connection, but there is less research on the internal sleeve connection joint which has the advantages of beautiful facade shape and short construction period. Therefore, it is very necessary to study the stress situation of the inner sleeve connection joint. Based on the above considerations, the ANSYS finite element software is used to establish the Liang Zhu connection joint model of the steel tube inner sleeve-T part. Observe the failure form of side column joint under the action of beam end displacement cyclic load, and show hysteretic performance, skeleton curve and bearing capacity for it. By changing the thickness and length of the inner sleeve of the steel tube, the influence of the geometric parameters of the inner sleeve on the stress distribution of the joint joint is studied. Finally, an engineering example is given. The stress design and checking calculation of this kind of joint in steel frame are carried out. The results show that: under the action of reciprocating load, Liang Zhu joint of inner sleeve of steel pipe shows good hysteretic performance. The hysteretic curve of the specimen is of "bow" type, and the hysteretic curve of the specimen is "pinched" to a certain extent due to the effect of high strength bolt slip during the displacement loading. Finally, due to the large plastic deformation of the flange of T-joint, the joint is destroyed. With the increase of the inner sleeve thickness, the stiffness of the joints increases, the hysteretic performance of the specimen increases obviously, the yield bearing capacity and ultimate bearing capacity also increase, and the consumption capacity of kinetic energy increases under reciprocating load. The tensile force value of high strength tensile bolt increases gradually and the plastic deformation of T-shaped part decreases, while the stress level of inner sleeve and T-shaped part decreases. With the increase of the inner sleeve length of the steel tube, the vertical spacing of the tension bolt increases with the high strength, and the restraint effect on the T-shaped part is weakened, which results in the bending deformation in the middle flange, warping deformation at the end of the flange of the T-shaped part, and the increase of the plastic deformation. When the stress value decreases, the yield bearing capacity and ultimate bearing capacity of the specimens are decreased, the deformation capacity of the joints is increased, and the consumption capacity of kinetic energy is reduced. Therefore, it is suggested that the joint should be satisfied with the requirements of connection. The length of the inner sleeve is as small as possible, the thickness is more than 2 mm of the outer column wall, and the joint is economical in material and good in mechanical performance. Through checking calculation, this kind of joint form can effectively transfer the load from the end of the beam to the column. The force is safe and reliable.
【学位授予单位】：青岛理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU392.3

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