本文關(guān)鍵詞： 施工缺陷 RC框架結(jié)構(gòu) 梁柱節(jié)點(diǎn) 力學(xué)性能　出處：《西安工業(yè)大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：節(jié)點(diǎn)核心區(qū)受力復(fù)雜,是鋼筋混凝土(RC)框架結(jié)構(gòu)傳力的關(guān)鍵部件。由于RC框架結(jié)構(gòu)的梁、柱縱向鋼筋及箍筋在節(jié)點(diǎn)處相交,所以節(jié)點(diǎn)核心區(qū)的鋼筋分布非常密集,這將導(dǎo)致梁柱節(jié)點(diǎn)在施工中容易出現(xiàn)澆筑困難和振搗不密實(shí)的情況·,此外,節(jié)點(diǎn)施工受支模、鋼筋綁扎等工序影響,易產(chǎn)生節(jié)點(diǎn)箍筋移位、箍筋缺失及縱筋露出等施工缺陷,這些施工缺陷將給RC梁柱節(jié)點(diǎn)以及整體結(jié)構(gòu)的受力性能帶來(lái)影響�，F(xiàn)有節(jié)點(diǎn)試驗(yàn)及數(shù)值模擬研究大多圍繞節(jié)點(diǎn)抗震性能研究、地震損傷模式和節(jié)點(diǎn)加固方法開展,關(guān)于節(jié)點(diǎn)施工缺陷影響的研究尚不充分,因此,研究施工缺陷對(duì)鋼筋混凝土框架節(jié)點(diǎn)性能的影響具有十分重要的意義�？偨Y(jié)了實(shí)際工程中梁柱節(jié)點(diǎn)施工缺陷的成因和特點(diǎn),歸納和總結(jié)了現(xiàn)有節(jié)點(diǎn)傳力機(jī)理及其計(jì)算方法。利用ABAQUS軟件建立了帶有節(jié)點(diǎn)漏漿、箍筋缺失等施工缺陷的RC框架梁柱節(jié)點(diǎn)有限元分析模型,在節(jié)點(diǎn)模型的梁端及柱端分別施加逐級(jí)增大的單向荷載,研究施工缺陷對(duì)梁柱節(jié)點(diǎn)力學(xué)性能的影響。研究結(jié)果表明,帶施工缺陷節(jié)點(diǎn)模型在荷載作用下,鋼筋應(yīng)力分布較完好節(jié)點(diǎn)模型發(fā)生了明顯的改變,完好節(jié)點(diǎn)模型的應(yīng)力主要集中于梁端部,帶缺陷節(jié)點(diǎn)模型的應(yīng)力向節(jié)點(diǎn)核心區(qū)內(nèi)部集中,鋼筋在節(jié)點(diǎn)處發(fā)生屈服;通過(guò)對(duì)比帶缺陷節(jié)點(diǎn)與完好節(jié)點(diǎn)在單向加載下的力與位移關(guān)系曲線知,帶缺陷節(jié)點(diǎn)的承載能力低于完好節(jié)點(diǎn);帶施工缺陷節(jié)點(diǎn)在荷載作用下的橫向變形大于完好節(jié)點(diǎn),節(jié)點(diǎn)核心區(qū)的約束能力出現(xiàn)了下降,延性性能大大降低。基于ABAQUS有限元分析結(jié)果,利用SeismoStruct軟件建立了考慮節(jié)點(diǎn)施工缺陷的一榀框架非線性分析模型,通過(guò)對(duì)其進(jìn)行地震作用下的非線性動(dòng)力時(shí)程分析,研究了節(jié)點(diǎn)施工缺陷對(duì)RC框架結(jié)構(gòu)抗震性能的影響。分析結(jié)果表明,與完好框架結(jié)構(gòu)相比,帶節(jié)點(diǎn)施工缺陷框架結(jié)構(gòu)的自振周期得到延長(zhǎng),帶節(jié)點(diǎn)缺陷結(jié)構(gòu)的各樓層位移響應(yīng)均大于完好結(jié)構(gòu),說(shuō)明考慮施工缺陷后,結(jié)構(gòu)的剛度出現(xiàn)了降低;在多遇及罕遇地震作用下,完好結(jié)構(gòu)的各層層間剪力均大于帶節(jié)點(diǎn)缺陷結(jié)構(gòu),同時(shí)其各層層間位移小于帶節(jié)點(diǎn)缺陷結(jié)構(gòu),說(shuō)明帶節(jié)點(diǎn)損傷模型的抗震能力明顯降低。文中給出的考慮梁柱節(jié)點(diǎn)施工缺陷的RC框架結(jié)構(gòu)簡(jiǎn)化桿系有限元分析模型的數(shù)值建模方法,可以通過(guò)折減缺陷節(jié)點(diǎn)連接單元的剛度來(lái)模擬節(jié)點(diǎn)缺陷對(duì)結(jié)構(gòu)整體力學(xué)性能的影響,為實(shí)際工程中節(jié)點(diǎn)施工缺陷的評(píng)價(jià)以及加固方案的選取提供指導(dǎo),具有一定的工程應(yīng)用價(jià)值,同時(shí)也為進(jìn)一步開展考慮梁柱節(jié)點(diǎn)施工缺陷的RC框架結(jié)構(gòu)相關(guān)性能研究奠定了基礎(chǔ)。
[Abstract]:The stress in the core area of the joint is complex, and it is the key component of the transmission force in the RC frame structure. Because the beam, column longitudinal reinforcement and stirrups of RC frame structure intersect at the joint, the distribution of the reinforcement in the core area of the joint is very dense. This will lead to the construction of Liang Zhu joint easy to be difficult to place and vibration is not dense. In addition, the node construction is affected by supporting formwork, steel bar binding and other working procedures, easy to produce joint stirrups displacement, lack of stirrups, longitudinal bars exposed and other construction defects, These construction defects will affect the mechanical behavior of RC Liang Zhu joints and the whole structure. Most of the existing joint tests and numerical simulation studies focus on the seismic behavior of joints, seismic damage mode and joint reinforcement methods. The research on the influence of joint construction defects is not enough, so it is of great significance to study the effect of construction defects on the performance of reinforced concrete frame joints. The causes and characteristics of Liang Zhu joint construction defects in practical projects are summarized. In this paper, the mechanism and calculation method of the existing joint force transfer are summarized and summarized. The finite element analysis model of Liang Zhu joint of RC frame with defects such as joint leakage and lack of stirrups is established by using ABAQUS software, and the finite element analysis model of Liang Zhu joint of RC frame is established. The effects of construction defects on the mechanical properties of Liang Zhu joints are studied by applying a step by step increasing unidirectional load at the beam and column ends of the joint model. The results show that the joint model with construction defects is subjected to load. The stress distribution of the reinforced bar is obviously changed in the intact joint model. The stress of the intact joint model is mainly concentrated at the end of the beam, the stress of the model with defects is concentrated inside the core zone of the node, and the steel bar yields at the joint. By comparing the stress and displacement curves of the joints with and without defects under unidirectional loading, the load-carrying capacity of the joints with defects is lower than that of the intact joints, and the transverse deformation of the joints with construction defects is larger than that of the intact joints under load. Based on the results of ABAQUS finite element analysis, a nonlinear analysis model of frame considering joint construction defects is established by using SeismoStruct software. Through the nonlinear dynamic time history analysis of the RC frame structure under seismic action, the influence of the joint construction defects on the seismic behavior of RC frame structure is studied. The results show that the structure is better than the intact frame structure. The natural vibration period of the frame structure with joint defects is prolonged, and the displacement response of each floor of the frame structure with joint defects is larger than that of the intact structure, which indicates that the stiffness of the structure decreases after considering the construction defects, and under the action of frequent and rare earthquakes, The shear force between layers of intact structures is greater than that of defective structures with joints, and the displacement between layers is smaller than that of defective structures with joints. It is shown that the seismic capacity of the damage model with joints is obviously reduced. The numerical modeling method for simplified finite element analysis model of RC frame structure considering the construction defects of Liang Zhu joints is presented. The effects of joint defects on the overall mechanical properties of the structure can be simulated by reducing the stiffness of the connection elements of defective joints, which can provide guidance for the evaluation of joint construction defects and the selection of reinforcement schemes in practical engineering. It has certain engineering application value and lays a foundation for further research on the related performance of RC frame structure considering the construction defects of Liang Zhu joint.
【學(xué)位授予單位】：西安工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU375

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