發(fā)布時間：2018-04-22 02:00

  本文選題：抗震加固 + 梁柱邊柱節(jié)點(diǎn)��； 參考：《延邊大學(xué)》2017年碩士論文

【摘要】：隨著各國家建筑行業(yè)的迅速發(fā)展,主要考慮為重力荷載所設(shè)計的既有RC框架結(jié)構(gòu)建筑物,在地震作用下框架節(jié)點(diǎn)很容易受到剪切破壞。如今,相關(guān)加固梁柱節(jié)點(diǎn)的加固方式及抗震性能的研究甚少,其中框架節(jié)點(diǎn)是核心區(qū)域。在以往的多次大地震資料中明確說明,RC梁柱節(jié)點(diǎn)一般都在重力荷載和地震水平力作用下承受極大剪力,將引起節(jié)點(diǎn)區(qū)剪切破壞。尤其是,框架結(jié)構(gòu)中表現(xiàn)出脆性結(jié)構(gòu)之一,因?yàn)橹苯涣旱牟贿B續(xù)性會直接導(dǎo)致節(jié)點(diǎn)區(qū)混凝土約束能力及強(qiáng)度。因此對既有RC梁柱節(jié)點(diǎn)加固方法及抗震性能研究,具有十分重要的實(shí)際意義。根據(jù)查閱以往的有關(guān)文獻(xiàn),通過分析加固梁柱節(jié)點(diǎn)的加固方法及受力特性,對未加固梁柱節(jié)點(diǎn)試件上提出新的加固方法,并設(shè)計了 1/2縮尺比例的五種試件。第一種試件為對節(jié)點(diǎn)核心區(qū)未進(jìn)行加固的基本試件,其它試件為在梁柱結(jié)合面處三種不同形狀大小的粘鋼加固試件和一種Haunch加固試件。在試件進(jìn)行加固時,本研究將考慮到實(shí)際建筑物的結(jié)構(gòu)特性和節(jié)點(diǎn)核心區(qū)由于直交梁所形成的狹小空間,選擇節(jié)點(diǎn)核心區(qū)最優(yōu)、最合理的部位上進(jìn)行加固措施。本文對試件分別進(jìn)行低周反復(fù)加載試驗(yàn),并通過試驗(yàn)數(shù)據(jù)結(jié)果來分析試件的損壞程度、荷載-位移關(guān)系、耗能消散、阻尼比例、有效剛度、延性、失效模式等抗震性能。試驗(yàn)結(jié)果表明:因?yàn)樵诠?jié)點(diǎn)區(qū)粘貼了鋼板構(gòu)件,J-S1、J-S2、J-S3、J-H加固試件均顯著提高了節(jié)點(diǎn)區(qū)極限承載力。與基本試件相比,在正方向加載段分別提高了26%、10%、12%、64%,反方向加載段提高了 11%、5%、8%、53%。三種粘鋼加固試件的位移延性系數(shù)相對于J-1,依次增大了 8.3%、11.1%、6.7%。其中,J-S2粘鋼加固方式體現(xiàn)出最良好的延性性質(zhì),完全符合現(xiàn)《建筑抗震設(shè)計規(guī)范》GB50011-2010規(guī)定。除了加固試件J-H外,粘鋼加固試件的剛度、能量耗散、阻尼比提高幅度微小,但J-H加固試件能量耗散相對其余構(gòu)件提高了大約45%。在彈塑性階段各試件的阻尼比約0.035-0.087,也符合現(xiàn)《建筑抗震設(shè)計規(guī)范》GB50011-2010第8.2.2條的規(guī)定。粘貼鋼板對核心區(qū)混凝土起良好的約束作用,直接顯著提高構(gòu)件強(qiáng)度。同時,延緩節(jié)點(diǎn)核心區(qū)斜裂縫的發(fā)展,以此來提高節(jié)點(diǎn)的延性和耗能能力,避免節(jié)點(diǎn)核心區(qū)出現(xiàn)脆性破壞。利用ANSYS有限元分析軟件對未加固基本試件進(jìn)行模擬,進(jìn)而可供實(shí)際加固工程設(shè)計和施工方法參考;基本試件的有限元模擬分析結(jié)果與試驗(yàn)結(jié)果吻合較好,均小于實(shí)測試驗(yàn)結(jié)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.
【學(xué)位授予單位】：延邊大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU352.11;TU375

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