【摘要】：鋼-混凝土組合梁是在鋼結(jié)構(gòu)與混凝土結(jié)構(gòu)的基礎(chǔ)上發(fā)展起來的,綜合了鋼與混凝土兩種不同類型材料的優(yōu)點(diǎn),且很大程度上彌補(bǔ)了各自的缺陷。自提出以來就被廣泛的應(yīng)用于工程實(shí)際中,并且隨著經(jīng)濟(jì)與社會(huì)的進(jìn)一步發(fā)展,組合結(jié)構(gòu)還將會(huì)有更為廣闊的發(fā)展空間。首先,對(duì)已有的鋼-混凝土組合梁變形及承載力的計(jì)算方法進(jìn)行了回顧,已有方法中普遍采用了不考慮滑移效應(yīng)或者將剪力連接件的剛度看成一個(gè)常數(shù)的假定,這與實(shí)際結(jié)構(gòu)的力學(xué)行為不符。鋼-混凝土組合梁與普通梁最大的區(qū)別在于在交界面處存在相對(duì)滑移,界面滑移特性主要由剪力連接件的力學(xué)性能所決定,本文對(duì)栓釘連接件的承載力和荷載-滑移關(guān)系曲線的研究成果進(jìn)行了統(tǒng)計(jì)歸納,并通過比較得到了較為合理的用于計(jì)算承載力和荷載滑移曲線計(jì)算公式。其次,對(duì)開源有限元程序OpenSEES進(jìn)行了介紹,并基于OpenSEES提出了用于鋼-混凝土組合梁分析的雙層纖維梁模型,其中鋼梁和混凝土板分別采用兩個(gè)獨(dú)立的纖維梁?jiǎn)卧M(jìn)行模擬,在交界面處設(shè)置零長(zhǎng)度單元以模擬剪力連接件的荷載-滑移關(guān)系,零長(zhǎng)度單元的節(jié)點(diǎn)分別與鋼梁和混凝土板的節(jié)點(diǎn)通過剛臂相連以使其能夠共同彎曲。采用C++編程語言對(duì)OpenSEES程序進(jìn)行了二次開發(fā),添加了新的單軸材料類MyUniaxialMaterial,該單軸材料模型可以通過自定義曲線上的若干點(diǎn)以直代曲的方式模擬剪力連接件的荷載-滑移非線性關(guān)系。最后,利用本文所提出的雙層纖維梁?jiǎn)卧Ｐ蛯?duì)一組鋼-混凝土簡(jiǎn)支梁和一組鋼-混凝土連續(xù)組合梁進(jìn)行加載至破壞的全過程分析,分析結(jié)果表明,對(duì)于不同形式的鋼-混凝土組合梁,本文方法均能對(duì)其進(jìn)行較為準(zhǔn)確的模擬。
[Abstract]:Steel-concrete composite beam is developed on the basis of steel structure and concrete structure. It combines the advantages of two different types of materials, steel and concrete, and makes up for their shortcomings to a large extent. Firstly, the existing methods for calculating the deformation and bearing capacity of steel-concrete composite beams are reviewed. The assumption that the stiffness of shear connectors is a constant or not considered is generally adopted in the existing methods, which is not consistent with the mechanical behavior of actual structures. The biggest difference between composite beams and ordinary beams is that there is relative slip at the interface. The interface slip characteristics are mainly determined by the mechanical properties of shear connectors. In this paper, the research results of bearing capacity and load-slip relationship curves of bolted connectors are statistically summarized, and a more reasonable calculation method is obtained by comparison. Secondly, the open-source finite element program OpenSEES is introduced. Based on OpenSEES, a double-layer fiber beam model for the analysis of steel-concrete composite beams is proposed. Two independent fiber beam elements are used to simulate the steel beam and the concrete slab, and zero-length elements are set at the interface. Simulating the load-slip relationship of shear connectors, the joints of zero-length elements are connected with steel beams and concrete slabs through rigid arms to make them bend together. OpenSEES program is redeveloped by C++ programming language, and a new uniaxial material class MyUniaxialMaterial is added. The uniaxial material model can be self-bending. Several points on the curve are defined to simulate the load-slip nonlinear relationship of shear connectors in the form of straight curves. Finally, a set of simply supported steel-concrete beams and a group of continuous composite steel-concrete beams are analyzed by using the double-layer fiber beam element model proposed in this paper. The results show that the load-failure process is different for different kinds of beams. In the form of steel-concrete composite beams, this method can accurately simulate them.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU398.9

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