新型翼缘削弱型弱轴连接节点滞回性能研究

发布时间：2018-08-01 14:19

【摘要】：目前钢结构工程中H形梁与H形柱弱轴连接都是采用弱轴楔形加劲板连接,而此种方式无论是受力性能还是加工制作都存在一定的不足之处。为了更好的解决H形柱弱轴方向的梁柱连接问题,同济大学李国强老师提出一种H型柱弱轴方向端板连接梁柱节点形式。而在现有柱弱轴连接研究中,长安大学卢林枫老师所在课题组提出了节点域箱形加强式工字形柱弱轴连接形式,研究表明该新型梁柱节点具有良好的受力性能和耗能能力,其破坏形式为在梁翼缘端部出现塑性铰。为了减小梁柱连接处焊缝应力,可通过构造措施实现塑形铰外移,这是解决钢框架结构梁柱节点处焊缝过早发生脆性破坏的有效方式。本文正是在李国强老师所提新型节点的基础上,综合考虑卢林枫老师课题组系列试验的经验和结论,进而提出新型翼缘削弱型梁柱弱轴连接节点。本文利用ABAQUS软件研究了梁柱强轴连接翼缘削弱型节点的滞回性能,并与已有该节点的试验和有限元数据作对比研究,验证了本文有限元建模方法的可靠性。对比分析了新型翼缘削弱型梁柱弱轴连接节点滞回性能的差异,并探讨了新型弱轴连接中有关参数对节点力学性能的影响,包括柱加劲肋厚度、柱端板厚度、柱端板高度以及各削弱参数的参考设计值。研究表明:(1)新型翼缘削弱型弱轴连接节点、传统翼缘削弱型弱轴连接节点均可实现塑性铰外移,但新型翼缘削弱型弱轴连接节点有较高的承载力和延性性能。(2)新型翼缘削弱型弱轴连接节点初始刚度、承载力随柱加劲肋厚度和柱端板厚度变大而增大,随柱端板高度变化不大。(3)新型翼缘削弱型弱轴连接节点的削弱参数参考强轴连接相关削弱参数取值设计,且设计范围差异不大。本文建议新型翼缘削弱型弱轴连接节点柱加劲肋厚度和梁翼缘厚度等厚或增加2mm,柱端板厚度比梁翼缘厚度厚2-4mm,柱端板高度高出梁翼缘120mm;建议柱端板至削弱区距离a取0.5bf~0.75bf之间,削弱段长度b取0.65h_b～0.85h_b之间,削弱深度c取0.21b_f～0.24b_f之间。
[Abstract]:At present, the weak axis connection between H-beam and H-shaped column in steel structure engineering adopts weak shaft wedge stiffening plate connection, but this kind of method has some shortcomings in both mechanical performance and machining. In order to better solve the problem of Liang Zhu connection in the weak axis direction of H-shaped column, Li Guoqiang teacher of Tongji University proposed a kind of Liang Zhu joint with weak axial direction end-plate connection of H-shaped column. In the existing research on weak axis connection of column, the research group of teacher Lu Linfeng of Changan University put forward the weak axis connection form of I-shaped column with box type in node domain. The research shows that the new type of Liang Zhu joint has good mechanical performance and energy dissipation ability. The failure form is plastic hinge at the end of the beam flange. In order to reduce the stress of weld at Liang Zhu joint, the plastic hinge can be moved out by means of structural measures, which is an effective way to solve the premature brittle failure of weld at Liang Zhu joint of steel frame structure. On the basis of the new node proposed by Li Guoqiang teacher, this paper synthetically considers the experience and conclusion of teacher Lu Linfeng's series of experiments, and then puts forward a new type of weakly flange Liang Zhu weak shaft connection node. In this paper, the hysteretic performance of flange weakening joint with Liang Zhu strong shaft connection is studied by using ABAQUS software, and compared with the existing test and finite element data of the joint, the reliability of the finite element modeling method in this paper is verified. The difference of hysteretic performance of a new type of weak flange Liang Zhu joint is compared and analyzed. The influence of some parameters on the joint's mechanical properties, including column stiffening rib thickness, column end plate thickness, is discussed. Column end plate height and reference design values for each weakening parameter. The results show that: (1) A new type of flange weakly connected joints and traditional flange weakly connected joints can realize plastic hinge displacement. However, the new flange weakly connected joints have high bearing capacity and ductility. (2) the initial stiffness and bearing capacity of the new flange weakly connected joints increase with the increase of column stiffening rib thickness and column end plate thickness. (3) the weakening parameters of the new flange weakly connected joints are designed with reference to the strong axis connection correlation weakening parameters, and the design range is not different. In this paper, it is suggested that the thickness of stiffened rib and beam flange should be equal or increased by 2mm, the thickness of column end plate is 2-4mm thicker than that of beam flange, and the height of column end plate is 120mm higher than that of beam flange, and the distance from column end plate to weakening zone a should be taken as 0.5bf~0.75bf. The length of weakening segment b is between 0.65h_b~0.85h_b and the depth of weakening c is between 0.21b_f~0.24b_f.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU391

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