本文關(guān)鍵詞： 鋼筋混凝土結(jié)構(gòu) 有限元 Abaqus MPC子程序 多點(diǎn)約束（MPC）　出處：《重慶交通大學(xué)》2013年碩士論文　論文類型：學(xué)位論文

【摘要】：鋼筋混凝土結(jié)構(gòu)的有限元分析方法一直都是研究的熱點(diǎn)問題，其核心問題就是如何處理鋼筋和混凝土的連接關(guān)系。 通用有限元軟件Abaqus具有豐富的求解功能和較強(qiáng)的開放結(jié)構(gòu)體系，對于鋼筋混凝土結(jié)構(gòu)，其內(nèi)置的Embedded方法可以模擬鋼筋和混凝土的完全粘結(jié)關(guān)系，多種子程序接口為用戶實(shí)現(xiàn)個性要求提供了可能。其中多點(diǎn)約束方程（MPC）技術(shù)可以用于模擬各種復(fù)雜連接關(guān)系，既可模擬鋼筋和混凝土之間的完全粘結(jié)，也可模擬二者的粘結(jié)滑移。 為模擬鋼筋和混凝土之間的連接關(guān)系，本文對Abaqus-MPC子程序的實(shí)現(xiàn)技術(shù)開展研究，具體包括以下內(nèi)容： ①基于位移協(xié)調(diào)模式，推導(dǎo)了鋼筋節(jié)點(diǎn)和混凝土節(jié)點(diǎn)的無滑移粘結(jié)多點(diǎn)約束關(guān)系，并按照MPC子程序的相關(guān)要求，編寫了處理無滑移粘結(jié)的的MPC子程序。并將子程序的計算結(jié)果和Abaqus自帶的節(jié)點(diǎn)耦合方法和嵌入方法進(jìn)行了對比，對比結(jié)果一致。 ②在無滑移粘結(jié)的基礎(chǔ)上，通過解除相關(guān)自由度方向的約束，，得到了無粘結(jié)滑移的多點(diǎn)約束關(guān)系，同樣按照MPC子程序的要求，編寫了處理無粘結(jié)滑移的MPC子程序，并通過等效荷載的方法和變形關(guān)系驗(yàn)證了其正確性。該方法比目前通過添加粘結(jié)單元處理無粘結(jié)滑移更方便，可以方便的應(yīng)用到無粘結(jié)預(yù)應(yīng)力結(jié)構(gòu)。 ③對于有粘結(jié)滑移的情況，提出了結(jié)合彈簧單元和多點(diǎn)約束關(guān)系的處理方法。即通過在鋼筋節(jié)點(diǎn)重合的位置建立新的節(jié)點(diǎn)，然后將新建節(jié)點(diǎn)和所在混凝土單元節(jié)點(diǎn)建立多點(diǎn)約束關(guān)系，新建節(jié)點(diǎn)和鋼筋節(jié)點(diǎn)之間用彈簧單元粘結(jié)。這比直接在鄰近節(jié)點(diǎn)間建立彈簧連接更精確，比劃分單元時要求鋼筋節(jié)點(diǎn)位置和混凝土節(jié)點(diǎn)位置重合更方便。 通過本文研究，實(shí)現(xiàn)了鋼筋混凝土結(jié)構(gòu)鋼筋和混凝土之間有粘結(jié)、無粘結(jié)的分析計算，模擬了鋼筋和混凝土不同大小區(qū)域連接失效對鋼筋混凝梁的影響：對于鋼筋混凝土梁，鋼筋和混凝土的有效粘結(jié)比無粘結(jié)情況下的梁的撓度、梁底緣混凝土的主拉應(yīng)力，梁開裂后裂紋尖端的應(yīng)力強(qiáng)度因子都更小，并且這種趨勢隨著粘結(jié)失效區(qū)域的擴(kuò)大更加明顯。
[Abstract]:The finite element analysis method of reinforced concrete structure has always been a hot topic. The core problem is how to deal with the connection between reinforcement and concrete. The general finite element software Abaqus has abundant solving function and strong open structure system. For reinforced concrete structure, its built-in Embedded method can simulate the complete bond relationship between steel bar and concrete. The multi-point constraint equation (MPC) technique can be used to simulate all kinds of complex connections, which can be used to simulate the complete bond between steel bar and concrete. The bond-slip between them can also be simulated. In order to simulate the connection between steel bar and concrete, this paper studies the implementation technology of Abaqus-MPC subroutine, including the following contents:. 1. Based on the displacement coordination model, the multi-point constraint relationship between reinforced joints and concrete joints without slip bond is derived, and according to the relevant requirements of MPC subroutine, A MPC subroutine dealing with non-slip bond is written, and the calculation results of the subroutine are compared with the nodal coupling method and embedding method of Abaqus. The results are in agreement with each other. 2 on the basis of non-slip bond, the multi-point constraint relation of non-bond slip is obtained by lifting the constraint of the direction of relative degree of freedom. According to the requirement of MPC subroutine, the MPC subroutine is written to deal with the unbonded slip. The validity of the method is verified by the method of equivalent load and the deformation relation. This method is more convenient than the present method by adding bond element to deal with unbonded slip, and it can be applied to unbonded prestressed structure conveniently. (3) for the case of bond-slip, a new method combining spring element and multi-point constraint relation is proposed, that is to say, a new joint is set up in the position where the reinforcement joint is overlapped. Then a multi-point constraint relationship is established between the new node and the node of the concrete element, and the connection between the new node and the reinforced joint is bonded with a spring element, which is more accurate than establishing a spring connection directly between adjacent nodes. It is more convenient than when dividing the unit to require the joint position of steel bar and the position of concrete joint to coincide. Through the research in this paper, the analysis and calculation of bond and unbond between reinforced concrete structure and steel bar are realized, and the influence of the connection failure of steel bar and concrete on the reinforced concrete concrete beam is simulated: for the reinforced concrete beam, The effective bond between steel bar and concrete is smaller than that of the beam without bond, the main tensile stress of concrete at the bottom of the beam and the stress intensity factor at the crack tip of the beam after cracking, and this trend is more obvious with the expansion of the bond failure zone.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TU375

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