本文選題：輕鋼框架　切入點(diǎn)：蒸壓加氣混凝土砌塊　出處：《武漢理工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：格構(gòu)輕鋼是近年來出現(xiàn)的一種新的輕鋼龍骨體系,以其自重輕、可高度工業(yè)化、工期短、濕作業(yè)少、抗震性好、造價(jià)低、綠色環(huán)保可回收等優(yōu)點(diǎn),而越來越多為人所知,并被推廣應(yīng)用于低、多層房屋住宅中。這種結(jié)構(gòu)體系墻體仍由密排的格構(gòu)片柱和格構(gòu)方柱組成,相對(duì)于鋼筋混凝土結(jié)構(gòu)有不密實(shí)的缺點(diǎn),且管壁較薄容易發(fā)生局部或整體失穩(wěn),從而降低了其極限承載力。本文為解決格構(gòu)輕鋼龍骨體系墻體的上述兩點(diǎn)不足,將墻體中格構(gòu)方柱組成的格構(gòu)輕鋼框架、蒸壓加氣混凝土砌體及包裹格構(gòu)輕鋼框架的發(fā)泡混凝土組合成一種新型輕鋼框架-蒸壓加氣混凝土砌塊組合墻體。本文以輕鋼框架-蒸壓加氣混凝土砌塊組合墻體為研究對(duì)象,首先簡要地介紹了墻體的組成、做法及特點(diǎn)。為了解不同材料的力學(xué)性能,論文在展開理論研究之前,對(duì)蒸壓加氣混凝土砌塊、發(fā)泡混凝土、砂漿和鋼材均做了彈性模量和極限抗壓強(qiáng)度試驗(yàn),在參考相關(guān)文獻(xiàn)和理論成果的基礎(chǔ)上得到了四種材料的受拉和受壓應(yīng)力應(yīng)變關(guān)系。論文利用ABAQUS有限元軟件,分別建立了格構(gòu)輕鋼框架及組合墻體的有限元模型,其中,格構(gòu)輕鋼框架中的鋼管和連接件分別簡化為梁單元。為簡化計(jì)算,僅沿厚度方向取出一半的組合墻體進(jìn)行建模分析。組合墻體建模時(shí),格構(gòu)框架中的鋼管和連接件簡化成梁單元,并嵌固于二維實(shí)體的發(fā)泡混凝土中。若干蒸壓混凝土砌塊也被分別簡化為二維實(shí)體單元,通過模擬砂漿的cohesive單元連接。而發(fā)泡混凝土和蒸壓混凝土砌塊之間直接通過merge命令組合在一起。在論文提出的輕鋼框架-蒸壓加氣混凝土砌體組合墻體簡化計(jì)算模型的基礎(chǔ)上,對(duì)組合墻體進(jìn)行了水平荷載作用下的抗側(cè)剛度和承載力的分析,并與試驗(yàn)結(jié)果進(jìn)行了對(duì)比,從而驗(yàn)證組合墻體理論建模方法的合理性。論文在組合墻體有限元模型的基礎(chǔ)上,分析了影響組合墻體抗側(cè)承載力和抗側(cè)剛度的若干因素,包括蒸壓加氣混凝土砌塊、砂漿和發(fā)泡混凝土的強(qiáng)度等級(jí)以及輕鋼框架鋼管的厚度。結(jié)果表明:輕鋼框架-砌塊組合墻體相比于輕鋼框架的抗側(cè)極限承載力和剛度均有顯著提高;提高蒸壓加氣混凝土砌塊、發(fā)泡混凝土和砂漿的強(qiáng)度等級(jí)能明顯提高組合墻體的抗側(cè)極限承載力,但對(duì)墻體抗側(cè)剛度提高不明顯;增大輕鋼框架鋼管的厚度能明顯提高組合墻體的抗側(cè)剛度,但對(duì)組合墻體的側(cè)向極限承載力的提高不明顯。本文對(duì)輕鋼框架-蒸壓混凝土砌體組合墻體進(jìn)行了有限元分析,研究成果為這種組合墻體的進(jìn)一步研究提供參考,為工程應(yīng)用提供理論依據(jù)。
[Abstract]:Lattice light steel is a new kind of light steel keel system which appears in recent years. It is more and more known for its advantages of light weight, high industrialization, short construction period, less wet operation, good seismic resistance, low cost, green environmental protection and recoverable, etc. The wall of this kind of structure system is still composed of dense lattice column and lattice square column, which has the disadvantage of not compactness compared with reinforced concrete structure, and the thin pipe wall is prone to local or global instability. Therefore, the ultimate bearing capacity is reduced. In order to solve the above two deficiencies of the lattice light steel keel wall, the lattice light steel frame composed of the lattice square column in the wall is used in this paper. A new type of light steel frame-autoclaved aerated concrete block composite wall is formed by the combination of autoclaved aerated concrete masonry and foamed concrete encased in lattice light steel frame. This paper takes the light steel frame-autoclaved aerated concrete block composite wall as the research object. In order to understand the mechanical properties of different materials, the autoclaved aerated concrete block and foamed concrete were studied before the theoretical study. The elastic modulus and ultimate compressive strength of mortar and steel are tested. Based on the references and theoretical results, the relationship between tensile and compressive stress and strain of four kinds of materials is obtained. The ABAQUS finite element software is used in this paper. The finite element models of lattice light steel frame and composite wall are established respectively, in which the steel pipe and the connectors in the lattice light steel frame are respectively simplified as beam elements. Only half of the composite walls are taken out along the thickness direction for modeling and analysis. When the composite walls are modeled, the steel pipes and connectors in the lattice frame are simplified into beam elements. A number of autoclaved concrete blocks are also reduced to two-dimensional solid elements. By simulating the cohesive element connection of mortar, the foamed concrete and autoclaved concrete block are directly combined by merge command. Based on the simplified calculation model of lightweight steel frame-autoclaved aerated concrete masonry masonry wall proposed in this paper, The lateral stiffness and bearing capacity of composite wall under horizontal load are analyzed and compared with the experimental results to verify the rationality of the theoretical modeling method of composite wall. Some factors affecting lateral bearing capacity and lateral stiffness of composite wall, including autoclaved aerated concrete block, are analyzed. The strength grade of mortar and foamed concrete and the thickness of light steel frame steel tube. The results show that the ultimate lateral bearing capacity and stiffness of light steel frame-block composite wall are significantly higher than those of light steel frame. Increasing the strength grade of autoclaved aerated concrete block foamed concrete and mortar can obviously improve the ultimate lateral bearing capacity of the composite wall but the anti-lateral stiffness of the wall is not obvious. Increasing the thickness of light steel frame steel tube can obviously improve the lateral stiffness of the composite wall, but the lateral ultimate bearing capacity of the composite wall is not obviously improved. In this paper, the finite element analysis of the light steel frame-autoclaved concrete masonry composite wall is carried out. The research results provide a reference for the further study of this composite wall and theoretical basis for engineering application.
【學(xué)位授予單位】：武漢理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU398

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