预制装配梁端钢板耗能铰节点及其弱梁强柱框架抗震性能

发布时间：2018-01-30 22:24

  本文关键词： 装配式 耗能 铰节点 设计可控 弱梁强柱　出处：《哈尔滨工业大学》2016年硕士论文　论文类型：学位论文

【摘要】：地震灾害自古以来就是人类面临的最严重的自然灾害之一,具有极强的随机性、不可预测性和大范围波及性,严重威胁着人类的生存和社会发展。近年来频发的强烈地震造成建筑结构大量破坏,导致大量的人员伤亡和财产损失。对于钢框架结构,梁柱节点的抗震性能对多层钢框架的抗震性能起着决定作用,人们一直寻求有效的节点设计,防止节点发生脆性破坏,以节点良好的延性和耗能能力有效提高结构的抗震性能。对于一些建筑,甚至要求其在大震作用下经过简单修复即可继续使用。在此背景下,本课题提出了一种可用于装配式钢结构中的预制装配梁端钢板耗能铰节点,它的设计思路是:首先节点通过销轴连接,形成铰接机制,承担竖向荷载,然后铰接销轴四周通过螺栓连接钢板,四周钢板为节点提供了抗转动的能力。此节点各参数可独立于梁柱进行设计并易于调整,其中钢板兼有承载与耗能的功能,耗能能力强。对于采用此预制装配梁端钢板耗能铰节点的结构,通过合理的参数设计,容易实现“弱梁强柱”这种良好的抗震体系,实现在大震作用下,结构变形和耗能主要集中在节点上,节点组合钢板进入塑性耗能,节点其余部分和结构主体构件依然处于弹性或弱非线性阶段,地震作用后,可以更换四周钢板实现结构整体功能的快速恢复,修复简单较易实现。基于此本文研究了以下内容:(1)基于节点的设计思路,进行了节点的构造设计。采用ABAQUS有限元分析软件建立了四种采用不同截面钢板的节点的有限元模型,分别对它们进行了单调位移加载和变幅循环加载模拟,研究了这四种采用不同截面钢板的节点的变形形式、应力应变分布、刚度、强度、耗能能力及疲劳性能,同时也为后续节点的足尺试验提供了设计参考。(2)根据有限元分析结果,舍弃了其中一种性能较差的钢板组合方式,对采用其余三种钢板组合方式的节点进行了拟静力试验和疲劳性能试验,详细记录并分析了试验现象,得到了三种节点的滞回曲线,结合试验现象分析了这三种节点的变形形式、刚度、强度、耗能能力,通过等幅疲劳试验研究验证了三种节点均具有优异的疲劳性能。(3)根据有限元分析和试验研究结果,对比采用不同钢板组合节点的力学性能,并考虑可装配性、可更换性,采用槽型截面钢板的节点是最优选择。基于薄板的小挠度理论和有限挠度理论,推导出采用槽型截面钢板节点的恢复力模型。然后基于本文提出的采用预制装配梁端钢板耗能铰节点结构的设计思路,具体设计了一个三层钢框架结构,分别对其进行静力非线性分析和动力时程非线性分析,验证了该设计思路的可行性。
[Abstract]:Since ancient times, earthquake disaster is one of the most serious natural disasters faced by human beings, which has strong randomness, unpredictability and wide range of contagion. Serious threat to human survival and social development. In recent years, frequent strong earthquakes caused a large number of damage to the building structure, resulting in a large number of casualties and property losses. The seismic behavior of Liang Zhu joints plays a decisive role in the seismic performance of multi-story steel frame. People have been looking for effective joint design to prevent the joint from brittle failure. The good ductility and energy dissipation capacity of the joints can effectively improve the seismic performance of the structure. For some buildings, it is even required to be simply repaired under the action of large earthquakes. In this paper, a prefabricated assembly beam end steel energy consumption joint is proposed, which can be used in the assembly steel structure. The design idea is: first, the joints are connected by pin shaft to form hinge mechanism to bear the vertical load. The hinged pin shaft is then bolted around the steel plate, which provides the joint with the ability to resist rotation. The parameters of the joint can be designed independently of Liang Zhu and are easy to adjust. The steel plate has the function of bearing and energy dissipation, and the energy dissipation ability is strong. For the structure of the steel plate energy dissipation hinge joint with this precast assembly beam end, the reasonable parameter design is adopted. It is easy to realize the good seismic system of "weak beam and strong column". Under the action of strong earthquake, the deformation and energy dissipation of the structure are mainly concentrated on the joints, and the combined steel plate of the joint enters into the plastic energy dissipation. The rest of the joints and the main members of the structure are still in the elastic or weakly nonlinear stage. After earthquake, the surrounding steel plates can be replaced to achieve the rapid recovery of the whole function of the structure. The repair is simple and easy to implement. Based on this, this paper studies the following contents: 1) Node-based design ideas. ABAQUS finite element analysis software is used to establish four finite element models of joints with different sections of steel plates. The monotone displacement loading and cyclic loading with variable amplitude are simulated, and the deformation forms, stress-strain distribution, stiffness, strength, energy dissipation capacity and fatigue performance of the four joints with different sections are studied. At the same time, it also provides the design reference for the full-scale test of the subsequent joints. (2) according to the results of finite element analysis, one of the poor performance of steel plate combination is abandoned. The pseudo-static test and fatigue performance test were carried out for the joints with the other three kinds of steel plate combinations. The experimental phenomena were recorded and analyzed in detail, and the hysteretic curves of the three joints were obtained. The deformation form, stiffness, strength and energy dissipation capacity of the three joints are analyzed in combination with the experimental phenomena. According to the finite element analysis and experimental results, the mechanical properties of the joints with different steel plates are compared. Considering the assemblability and exchangeability, the joint of slotted steel plate is the best choice. Based on the theory of small deflection and finite deflection of thin plate. The restoring force model of steel plate joints with slot section is derived. Then a three-story steel frame structure is designed based on the design idea of the joint structure of steel plate energy dissipation hinge with prefabricated assembly beam end proposed in this paper. Static nonlinear analysis and dynamic time history nonlinear analysis are carried out to verify the feasibility of the design idea.
【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】：2016
【分类号】：TU398;TU352.11
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本文编号：1477389