發(fā)布時(shí)間：2019-06-27 20:34

【摘要】：蜂窩梁是H型鋼或工字型鋼腹板沿折線切割后錯(cuò)位焊接所形成的一種鋼結(jié)構(gòu)構(gòu)件形式。蜂窩梁具有抗彎承載力高,利用孔洞穿越管道可以降低層高,具有較好的力學(xué)、美學(xué)和經(jīng)濟(jì)效益等優(yōu)點(diǎn),近幾十年來,蜂窩梁在美國(guó)、日本以及歐洲一些國(guó)家的高層建筑,工業(yè)廠房中應(yīng)用較多,并將蜂窩梁簡(jiǎn)化計(jì)算方法納入相應(yīng)規(guī)程。我國(guó)現(xiàn)在尚無蜂窩梁的設(shè)計(jì)規(guī)范,為滿足逐漸增多的工程需要,并為相應(yīng)規(guī)范的推出提供參考,應(yīng)對(duì)蜂窩梁進(jìn)行廣泛和深入的研究。蜂窩構(gòu)件腹板的局部穩(wěn)定問題是影響構(gòu)件承載力的重要因素。隨著生產(chǎn)水平和生產(chǎn)狀況的日益改善與發(fā)展,以及高強(qiáng)度鋼材的廣泛應(yīng)用,使得蜂窩構(gòu)件朝著更輕型更薄壁的方向發(fā)展,同時(shí)也更容易發(fā)生失穩(wěn)現(xiàn)象。因此對(duì)于蜂窩構(gòu)件的腹板局部穩(wěn)定影響因素進(jìn)行分析是必要的。本文通過試驗(yàn)和有限元分析相結(jié)合的方法,對(duì)蜂窩梁在彎剪作用下的腹板局部穩(wěn)定性進(jìn)行了深入研究。并且對(duì)主要影響因素開孔率,腹板高厚比和剪跨比進(jìn)行了以下幾方面研究：從理論上分析和論述了國(guó)外相關(guān)規(guī)范、規(guī)程對(duì)蜂窩梁計(jì)算的要求以及國(guó)內(nèi)相關(guān)設(shè)計(jì)方法中對(duì)實(shí)腹梁局部穩(wěn)定性計(jì)算的規(guī)定,確定本文的研究方向。進(jìn)行了3根蜂窩梁的局部穩(wěn)定性試驗(yàn),3根蜂窩梁分別開兩種孔型(六邊形、圓形)和兩種開孔率(60%、70%),通過試驗(yàn)研究剪跨比、開孔率和腹板高厚比對(duì)蜂窩梁腹板局部穩(wěn)定性的影響規(guī)律,并對(duì)比不同孔型,不同開孔率下的屈曲荷載,極限荷載以及破壞模式。以蜂窩梁腹板局部穩(wěn)定性試驗(yàn)研究為基礎(chǔ),利用有限元軟件ANSYS建立實(shí)腹梁計(jì)算得到的屈曲荷載與理論計(jì)算公式得到的屈曲荷載值進(jìn)行對(duì)比,發(fā)現(xiàn)二者擬合程度良好,再通過試驗(yàn)中的變形和荷載—位移曲線與有限元計(jì)算得到的結(jié)果進(jìn)行對(duì)比,得到兩者擬合程度良好,驗(yàn)證了本文建立的有限元模型的有效性。在試驗(yàn)的基礎(chǔ)上,分別對(duì)蜂窩梁進(jìn)行了大量的有限元參數(shù)分析。對(duì)不同孔型、不同腹板高厚比、不同剪跨比以及不同開孔率下蜂窩梁的破壞模式、極限承載力和彈性屈曲荷載進(jìn)行了研究和分析。分析每個(gè)參數(shù)對(duì)于彈性屈曲荷載以及極限荷載的影響。通過影響參數(shù)與彈性屈曲荷載的關(guān)系,最終使用數(shù)學(xué)軟件SPSSC中的非線性回歸分析,擬合出蜂窩梁的彈性屈曲荷載公式,為實(shí)際設(shè)計(jì)提供參考,并且通過理論分析推導(dǎo)出適用于蜂窩梁的高厚比限值公式。以上研究成果,為蜂窩梁的局部穩(wěn)定設(shè)計(jì)提供了理論依據(jù),也為工程應(yīng)用提供了參考。
[Abstract]:Honeycomb beam is a kind of steel structure member formed by dislocation welding of H-shaped steel or I-shaped steel web after broken wire cutting. Honeycomb beam has the advantages of high bending bearing capacity, low floor height by hole crossing pipeline, good mechanics, aesthetics and economic benefit. In recent decades, honeycomb beam has been widely used in high-rise buildings and industrial buildings in the United States, Japan and some European countries, and the simplified calculation method of honeycomb beam has been brought into the corresponding rules. At present, there is no design code of honeycomb beam in our country, in order to meet the increasing engineering needs and provide reference for the introduction of the corresponding code, the honeycomb beam should be widely and deeply studied. The local stability of honeycomb web is an important factor affecting the bearing capacity of honeycomb members. With the improvement and development of production level and production condition, as well as the wide application of high strength steel, the honeycomb component is developing in the direction of lighter and thinner wall, and it is also more prone to instability. Therefore, it is necessary to analyze the influencing factors of web local stability of honeycomb components. In this paper, the local stability of the web of honeycomb beams under bending and shear is studied by means of experiments and finite element analysis. The main influencing factors, such as opening rate, web height to thickness ratio and shear span ratio, are studied in the following aspects: the relevant foreign codes, the requirements of the code for the calculation of honeycomb beams and the provisions of the domestic design methods for the local stability calculation of the real web beams are analyzed and discussed theoretically, and the research direction of this paper is determined. The local stability tests of three honeycomb beams were carried out. Three honeycomb beams opened two kinds of holes (hexagonal, circular) and two kinds of holes (60%, 70%) respectively. The effects of shear span ratio, opening ratio and web thickness ratio on the local stability of honeycomb beams were studied by experiments, and the buckling loads, ultimate loads and failure modes under different holes and different opening rates were compared. Based on the experimental study on the local stability of the web of honeycomb beam, the buckling load calculated by the real web beam is compared with the buckling load value obtained by the theoretical calculation formula by using the finite element software ANSYS. It is found that the fitting degree of the two is good, and then the deformation and load-displacement curves in the test are compared with the results obtained by the finite element calculation, and the fitting degree of the two is good. The effectiveness of the finite element model established in this paper is verified. On the basis of experiments, a large number of finite element parameter analysis of honeycomb beams is carried out. The failure modes, ultimate bearing capacity and elastic buckling load of honeycomb beams with different holes, different web height to thickness ratios, different shear span ratios and different opening ratios are studied and analyzed. The influence of each parameter on elastic buckling load and ultimate load is analyzed. Through the relationship between the influencing parameters and the elastic buckling load, the elastic buckling load formula of the honeycomb beam is fitted by using the nonlinear regression analysis in the mathematical software SPSSC, which provides a reference for the practical design, and the formula of the limit value of the ratio of height to thickness suitable for the honeycomb beam is derived through theoretical analysis. The above research results provide a theoretical basis for the local stability design of honeycomb beams and a reference for engineering application.
【學(xué)位授予單位】：沈陽建筑大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU391

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1 言正;箱形吊臂腹板局部穩(wěn)定性[J];工程機(jī)械;1983年03期

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3 程耿東，郭旭;考慮局部穩(wěn)定性約束的桁架拓?fù)鋬?yōu)化設(shè)計(jì)[J];大連理工大學(xué)學(xué)報(bào);1995年06期

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本文編號(hào)：2507129