粘钢和HAUNCH加固框架梁柱节点抗震性能试验研究

发布时间：2018-04-22 02:00

本文选题：抗震加固 + 梁柱边柱节点　；参考：《延边大学》2017年硕士论文

【摘要】：随着各国家建筑行业的迅速发展,主要考虑为重力荷载所设计的既有RC框架结构建筑物,在地震作用下框架节点很容易受到剪切破坏。如今,相关加固梁柱节点的加固方式及抗震性能的研究甚少,其中框架节点是核心区域。在以往的多次大地震资料中明确说明,RC梁柱节点一般都在重力荷载和地震水平力作用下承受极大剪力,将引起节点区剪切破坏。尤其是,框架结构中表现出脆性结构之一,因为直交梁的不连续性会直接导致节点区混凝土约束能力及强度。因此对既有RC梁柱节点加固方法及抗震性能研究,具有十分重要的实际意义。根据查阅以往的有关文献,通过分析加固梁柱节点的加固方法及受力特性,对未加固梁柱节点试件上提出新的加固方法,并设计了 1/2缩尺比例的五种试件。第一种试件为对节点核心区未进行加固的基本试件,其它试件为在梁柱结合面处三种不同形状大小的粘钢加固试件和一种Haunch加固试件。在试件进行加固时,本研究将考虑到实际建筑物的结构特性和节点核心区由于直交梁所形成的狭小空间,选择节点核心区最优、最合理的部位上进行加固措施。本文对试件分别进行低周反复加载试验,并通过试验数据结果来分析试件的损坏程度、荷载-位移关系、耗能消散、阻尼比例、有效刚度、延性、失效模式等抗震性能。试验结果表明:因为在节点区粘贴了钢板构件,J-S1、J-S2、J-S3、J-H加固试件均显著提高了节点区极限承载力。与基本试件相比,在正方向加载段分别提高了26%、10%、12%、64%,反方向加载段提高了 11%、5%、8%、53%。三种粘钢加固试件的位移延性系数相对于J-1,依次增大了 8.3%、11.1%、6.7%。其中,J-S2粘钢加固方式体现出最良好的延性性质,完全符合现《建筑抗震设计规范》GB50011-2010规定。除了加固试件J-H外,粘钢加固试件的刚度、能量耗散、阻尼比提高幅度微小,但J-H加固试件能量耗散相对其余构件提高了大约45%。在弹塑性阶段各试件的阻尼比约0.035-0.087,也符合现《建筑抗震设计规范》GB50011-2010第8.2.2条的规定。粘贴钢板对核心区混凝土起良好的约束作用,直接显著提高构件强度。同时,延缓节点核心区斜裂缝的发展,以此来提高节点的延性和耗能能力,避免节点核心区出现脆性破坏。利用ANSYS有限元分析软件对未加固基本试件进行模拟,进而可供实际加固工程设计和施工方法参考;基本试件的有限元模拟分析结果与试验结果吻合较好,均小于实测试验结果。
[Abstract]:With the rapid development of the construction industry in various countries, the existing RC frame structure buildings designed for gravity loads are mainly considered. The joints of the frame are vulnerable to shear failure under earthquake. Nowadays, there are few studies on the reinforcement methods and seismic behavior of Liang Zhu joints, in which the frame joints are the core area. It is clear from the previous large seismic data that the joint of RC Liang Zhu usually bears a great shear force under the action of gravity load and seismic horizontal force, which will cause shear failure in the joint area. In particular, one of the brittle structures appears in the frame structure, because the discontinuity of the straight intersection beam will directly lead to the concrete restraint capacity and strength in the joint area. Therefore, it is of great practical significance to study the reinforcement method and seismic performance of existing RC Liang Zhu joints. According to the previous literature, through the analysis of the strengthening method and mechanical characteristics of Liang Zhu joint, a new reinforcement method is put forward for the unreinforced Liang Zhu joint specimen, and five specimens with a scale of 1 / 2 scale are designed. The first kind of specimen is the basic specimen which has not been strengthened in the core area of the joint, the other is three kinds of bonded steel specimens with different shapes and sizes at the Liang Zhu joint surface and one kind of Haunch strengthening specimen. When the specimen is strengthened, this study will consider the structural characteristics of the actual building and the narrow space formed by the joint core area due to the direct intersection beam, and select the best joint core area and the most reasonable reinforcement measures. In this paper, the low-cycle repeated loading tests are carried out on the specimens, and the seismic properties of the specimens such as damage degree, load-displacement relationship, energy dissipation, damping ratio, effective stiffness, ductility and failure mode are analyzed by the test data. The test results show that the ultimate bearing capacity of the joint zone is improved significantly because the steel plate member J-S1 / J-S2J-S2J-S3 / J-H is bonded to the joint area. Compared with the basic specimen, the positive loading section has increased 26%, 10%, 12% and 64%, respectively, and the reverse loading section has increased 11%, 5% and 8%, respectively. Relative to J-1, the displacement ductility coefficient of the three specimens strengthened by bonded steel increases by 8.3 and 11.1and 6.7in turn. The strengthening method of J-S2 bonded steel shows the best ductility and conforms to the GB50011-2010 regulations of the current Code for Seismic Design of buildings. In addition to strengthening J-H, the stiffness, energy dissipation and damping ratio of the specimens strengthened by bonded steel are slightly increased, but the energy dissipation of J-H strengthened specimens is increased by about 45% compared with the other members. In the elastic-plastic stage, the damping ratio of each specimen is about 0.035-0.087, which is also in accordance with Article 8.2.2 of the current Code for Seismic Design of buildings (GB50011-2010). Bonding steel plate acts as a good constraint on the core concrete and directly increases the strength of the member. At the same time, the development of oblique cracks in the core area of the joints is delayed, so as to improve the ductility and energy dissipation ability of the joints and to avoid brittle failure in the core areas of the joints. The ANSYS finite element analysis software is used to simulate the unreinforced basic specimens, which can be used as a reference for the design and construction methods of practical reinforcement engineering, and the finite element simulation results of the basic specimens are in good agreement with the experimental results, which are all smaller than the actual test results.
【学位授予单位】：延边大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU352.11;TU375

【参考文献】