【摘要】：近年來，高層和超高層建筑結(jié)構(gòu)在我國發(fā)展迅速，各地的建筑高度不斷被刷新。伴隨著高層超高層建筑的不斷發(fā)展，鋼-混凝土組合結(jié)構(gòu)這一特殊的結(jié)構(gòu)形式也得到了廣泛的應(yīng)用，因?yàn)樗軡M足人們對(duì)建筑空間寬敞性和靈活性的要求。作為一種新型的結(jié)構(gòu)形式，鋼-混凝土組合結(jié)構(gòu)能夠充分發(fā)揮鋼材和混凝土的材料優(yōu)點(diǎn)，應(yīng)用前景良好。 作為鋼-混凝土組合結(jié)構(gòu)的一種，鋼管混凝土因具有承載能力高、塑性和韌性好、施工簡(jiǎn)便以及良好的經(jīng)濟(jì)效益等優(yōu)點(diǎn)而越來越被工程界所青睞，于近些年得到了快速的發(fā)展，已經(jīng)大量應(yīng)用于高層、大跨以及空間等結(jié)構(gòu)。 得益于鋼管可以直接充當(dāng)模板，鋼管混凝土很好地解決了混凝土澆筑和施工速度之間的矛盾。由于在施工時(shí)，一般是先固定好鋼管，然后再澆筑混凝土，這就造成了鋼管內(nèi)部會(huì)產(chǎn)生初應(yīng)力以及混凝土在早齡期的受力問題，這會(huì)在一定程度上對(duì)構(gòu)件施工期的結(jié)構(gòu)性能產(chǎn)生一定的影響。本文對(duì)鋼管混凝土柱在施工期的結(jié)構(gòu)性能進(jìn)行了研究，主要完成了以下工作： ①分析了混凝土強(qiáng)度、彈性模量和泊松比隨齡期的發(fā)展關(guān)系�；炷翉�(qiáng)度和彈性模量發(fā)展趨勢(shì)類似，在早期發(fā)展比較快，強(qiáng)度在7天時(shí)能夠達(dá)到標(biāo)準(zhǔn)強(qiáng)度的70%左右，但后期增長(zhǎng)較慢，趨于穩(wěn)定；而泊松比在在各齡期時(shí)發(fā)展變化不大，整體在0.18左右。 ②系統(tǒng)地研究了施工期受力對(duì)鋼管混凝土后期性能的影響，通過控制鋼管初應(yīng)力大小不大于其抗壓強(qiáng)度的60%以及混凝土早齡期受力大小不大于其當(dāng)時(shí)強(qiáng)度的70%，并保證混凝土后期的養(yǎng)護(hù)條件符合規(guī)范要求，，來保證鋼管混凝土后期強(qiáng)度的發(fā)展。 ③鋼管和混凝土的相互作用，使得鋼管混凝土的徐變變得復(fù)雜。本文采用多軸理論對(duì)鋼管混凝土在軸壓荷載作用下的徐變進(jìn)行分析，得出以下結(jié)論：應(yīng)力級(jí)別增加會(huì)導(dǎo)致徐變?cè)黾樱缓撀实脑龃髸?huì)增強(qiáng)鋼管對(duì)混凝土的約束效應(yīng)，從而導(dǎo)致徐變減�。换炷恋男熳儠�(huì)隨其強(qiáng)度的增長(zhǎng)而變大。 ④利用有限元軟件ABAQUS對(duì)處于施工期階段的鋼管混凝土柱在軸壓和偏壓荷載作用下的受力性能進(jìn)行模擬分析。得出在鋼管混凝土的強(qiáng)度在早期增長(zhǎng)幅度較快，后期增幅變小；在小偏心荷載作用下，由于構(gòu)件受力不均勻，需要將鋼管對(duì)核心混凝土的約束作用進(jìn)行折減。構(gòu)件在破壞時(shí)表現(xiàn)為強(qiáng)度破壞，破壞截面全部發(fā)展為塑性。 ⑤針對(duì)鋼管混凝土這一特殊的結(jié)構(gòu)形式，從結(jié)構(gòu)設(shè)計(jì)、材料選擇以及施工三個(gè)方面提出措施來保證鋼管混凝土在施工期的安全和質(zhì)量。
[Abstract]:In recent years, high-rise and super-high-rise building structures have developed rapidly in our country. With the continuous development of high-rise and super-high-rise buildings, the steel-concrete composite structure has been widely used, because it can meet the requirements of the spacious and flexible building space. As a new type of structure, steel-concrete composite structure can give full play to the advantages of steel and concrete materials, and has a good application prospect. As a kind of steel-concrete composite structure, concrete-filled steel tube (CFST) is more and more popular in engineering field because of its advantages of high bearing capacity, good plasticity and toughness, simple construction and good economic benefit, and has been developed rapidly in recent years. It has been widely used in high-rise, long-span and space structures. Because the steel tube can be used as a formwork directly, the contradiction between concrete pouring and construction speed is well solved. In construction, the steel pipe is usually fixed first, then the concrete is poured, which causes the initial stress inside the steel tube and the stress of the concrete at the early age. To a certain extent, this will affect the structural performance of components during construction. In this paper, the structural properties of concrete-filled steel tubular columns during construction are studied. The main works are as follows: 1 the relationship between the strength, elastic modulus and Poisson's ratio of concrete with age is analyzed. The development trend of the strength and elastic modulus of concrete is similar. The strength can reach about 70% of the standard strength at 7 days, but the growth is slow and tends to be stable in the later stage. The Poisson's ratio changed little at each age, and the whole was about 0.18. (2) the effect of stress on the later performance of concrete filled steel tube during construction period is systematically studied. By controlling the initial stress of steel tube not more than 60% of its compressive strength and the force of concrete at early age not greater than 70% of its strength at that time, The later curing conditions of concrete are in accordance with the specifications to ensure the development of later strength of concrete-filled steel tubular (CFST). The interaction between steel tube and concrete makes the creep of concrete filled steel tube become complicated. In this paper, the multi-axial theory is used to analyze the creep of concrete-filled steel tube under axial compression. The following conclusions are drawn: the increase of stress level will lead to the increase of creep; The increase of steel-containing ratio will enhance the restraint effect of steel pipe on concrete, which will lead to the decrease of creep, and the creep of concrete will increase with the increase of its strength. (4) the finite element software ABAQUS is used to simulate and analyze the behavior of concrete-filled steel tubular columns under axial and eccentric loads during the construction period. It is concluded that the strength of concrete-filled steel tube (CFST) increases rapidly in the early stage and becomes smaller in the later stage. Under the action of small eccentricity, it is necessary to reduce the constraining effect of the steel tube on the core concrete due to the non-uniform force of the members. The failure behavior of the member is strength failure, and the failure section develops into plasticity. 5. Aiming at the special structure form of concrete-filled steel tubular (CFST), this paper puts forward some measures to ensure the safety and quality of CFST during construction from three aspects: structural design, material selection and construction.
【學(xué)位授予單位】：重慶大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU398.9

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