本文選題：鋼筋混凝土節(jié)點 + CFRP板條��； 參考：《上海應(yīng)用技術(shù)大學(xué)》2017年碩士論文

【摘要】：鋼筋混凝土(RC)框架結(jié)構(gòu)是工業(yè)與民用建筑工程中最常用的結(jié)構(gòu)形式之一,提高其抗震能力,對有效減輕震害具有重要的現(xiàn)實意義。按早期規(guī)范設(shè)計的RC框架節(jié)點往往不能滿足現(xiàn)行抗震規(guī)范的要求,如存在節(jié)點核心區(qū)箍筋配置不足等問題,有悖于“強節(jié)點弱構(gòu)件”的抗震概念設(shè)計原則,在地震中往往發(fā)生剪切破壞甚而導(dǎo)致建筑的倒塌。對于RC節(jié)點的抗震加固,已有大量的試驗研究和工程實踐,常用的加固方法主要有混凝土加大截面、粘貼鋼板、外包型鋼、高強鋼絞線網(wǎng)-聚合物砂漿和粘貼纖維增強復(fù)合材料(Fiber Reinforced Polymer/Plastic, FRP)等。與其它方法相比較,FRP具有高效高強、耐久性好、易施工等優(yōu)點,然而外貼FRP加固RC框架節(jié)點存在著FRP易剝離、梁鉸靠近柱面等缺陷�；诖�,本文提出了基于塑性鉸外移的碳纖維(CFRP)板條嵌入式(Near-surface-mounted,簡稱NSM)加固RC節(jié)點的加固方法,并通過擬靜力試驗進行了驗證,并在分析CFRP板條應(yīng)變分布和發(fā)展規(guī)律的基礎(chǔ)上,提出一種NSM CFRP板條加固RC節(jié)點的抗剪強度計算方法,為其工程設(shè)計和應(yīng)用提供理論依據(jù)。本文主要工作及研究成果如下:1.設(shè)計并制作了 4個十字形RC框架節(jié)點,其中1個按現(xiàn)行規(guī)范要求設(shè)計的抗震節(jié)點,3個為核心區(qū)未配箍筋的空節(jié)點。結(jié)合轉(zhuǎn)移塑性鉸的抗震理念及NSM加固方法,以CFRP板條面積、加固間距為主要參數(shù),對其中2個空節(jié)點進行加固。對試件節(jié)點進行低周反復(fù)荷載下的抗震試驗研究,深入對比分析了破壞模式、耗能、延性及強度、剛度退化等主要性能指標,以及CFRP板條應(yīng)變分布及發(fā)展情況。2.試驗結(jié)果表明,采用CFRP板條嵌入式加固能夠提高節(jié)點承載力,改善構(gòu)件的延性,阻滯構(gòu)件剛度退化,合理的布置CFRP板條間距甚至能夠使其破壞模式由節(jié)點核心區(qū)剪切破壞轉(zhuǎn)為遠離柱面的梁鉸破壞。3.鑒于NSM CFRP板條加固RC節(jié)點抗剪強度的理論研究不足,根據(jù)水平地震作用下節(jié)點核心區(qū)處于雙向拉壓應(yīng)力狀態(tài)這一受力特征,基于混凝土雙向拉壓強度準則,提出了一個CFRP板條NSM加固RC節(jié)點的抗剪強度計算方法,簡便實用且精度高。
[Abstract]:Reinforced concrete (RC) frame structure is one of the most commonly used structures in industrial and civil engineering. It is of great practical significance to improve its seismic resistance and reduce earthquake damage effectively. The RC frame joints designed according to the early codes often fail to meet the requirements of the current seismic code. For example, there are insufficient stirrups in the core areas of the joints, which is contrary to the seismic conceptual design principle of "strong joints and weak members". Shear damage and even collapse of buildings often occur in earthquakes. For the seismic strengthening of RC joints, there have been a lot of experimental research and engineering practice. High strength steel wire mesh-polymer mortar and bonded fiber reinforced composite material fiber reinforced polymer / plastic (FRP) etc. Compared with other methods, FRP has the advantages of high efficiency, good durability, easy construction and so on. However, FRP is easy to peel off the joints of RC frame strengthened with FRP, and the beam hinge is close to the cylindrical surface. Based on this, this paper presents a reinforcement method of RC joints strengthened with CFRP-based CFRP-based plastic hinges embedded with Near-surface-mountable (NSM), which is verified by quasi-static tests, and based on the analysis of the strain distribution and development law of CFRP plates. A new method for calculating the shear strength of RC joints strengthened with NSM CFRP plates is presented, which provides a theoretical basis for the engineering design and application. The main work and research results of this paper are as follows: 1. Four cross-shaped RC frame joints are designed and manufactured, one of which is designed according to the requirements of the current code, and three are empty joints with no stirrups in the core area. Combined with the aseismic concept of the transfer plastic hinge and the method of NSM reinforcement, two empty joints were strengthened with CFRP slab area and reinforcement spacing as the main parameters. The seismic test of the joints under low cyclic loading is carried out, and the main performance indexes, such as failure mode, energy dissipation, ductility and strength, stiffness degradation, and the strain distribution and development of CFRP slab are compared and analyzed. The experimental results show that CFRP slab embedded reinforcement can improve the bearing capacity of the joints, improve the ductility of the members, and block the degradation of the stiffness of the members. The reasonable arrangement of CFRP slab spacing can even change the failure mode from the shear failure in the core zone of the joint to the beam hinge failure away from the cylinder. 3. In view of the lack of theoretical study on the shear strength of RC joints strengthened with NSM CFRP sheets, according to the stress characteristics that the core region of the joints is in the state of biaxial tension and compression stress under horizontal earthquake, based on the criterion of concrete biaxial tension-compression strength. A method for calculating the shear strength of RC joints strengthened with CFRP strip NSM is presented, which is simple, practical and accurate.
【學(xué)位授予單位】：上海應(yīng)用技術(shù)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU375.4;TU352.11

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