弯剪应力下蜂窝梁腹板局部稳定性试验研究
发布时间：2019-06-27 20:34
【摘要】：蜂窝梁是H型钢或工字型钢腹板沿折线切割后错位焊接所形成的一种钢结构构件形式。蜂窝梁具有抗弯承载力高,利用孔洞穿越管道可以降低层高,具有较好的力学、美学和经济效益等优点,近几十年来,蜂窝梁在美国、日本以及欧洲一些国家的高层建筑,工业厂房中应用较多,并将蜂窝梁简化计算方法纳入相应规程。我国现在尚无蜂窝梁的设计规范,为满足逐渐增多的工程需要,并为相应规范的推出提供参考,应对蜂窝梁进行广泛和深入的研究。蜂窝构件腹板的局部稳定问题是影响构件承载力的重要因素。随着生产水平和生产状况的日益改善与发展,以及高强度钢材的广泛应用,使得蜂窝构件朝着更轻型更薄壁的方向发展,同时也更容易发生失稳现象。因此对于蜂窝构件的腹板局部稳定影响因素进行分析是必要的。本文通过试验和有限元分析相结合的方法,对蜂窝梁在弯剪作用下的腹板局部稳定性进行了深入研究。并且对主要影响因素开孔率,腹板高厚比和剪跨比进行了以下几方面研究：从理论上分析和论述了国外相关规范、规程对蜂窝梁计算的要求以及国内相关设计方法中对实腹梁局部稳定性计算的规定,确定本文的研究方向。进行了3根蜂窝梁的局部稳定性试验,3根蜂窝梁分别开两种孔型(六边形、圆形)和两种开孔率(60%、70%),通过试验研究剪跨比、开孔率和腹板高厚比对蜂窝梁腹板局部稳定性的影响规律,并对比不同孔型,不同开孔率下的屈曲荷载,极限荷载以及破坏模式。以蜂窝梁腹板局部稳定性试验研究为基础,利用有限元软件ANSYS建立实腹梁计算得到的屈曲荷载与理论计算公式得到的屈曲荷载值进行对比,发现二者拟合程度良好,再通过试验中的变形和荷载—位移曲线与有限元计算得到的结果进行对比,得到两者拟合程度良好,验证了本文建立的有限元模型的有效性。在试验的基础上,分别对蜂窝梁进行了大量的有限元参数分析。对不同孔型、不同腹板高厚比、不同剪跨比以及不同开孔率下蜂窝梁的破坏模式、极限承载力和弹性屈曲荷载进行了研究和分析。分析每个参数对于弹性屈曲荷载以及极限荷载的影响。通过影响参数与弹性屈曲荷载的关系,最终使用数学软件SPSSC中的非线性回归分析,拟合出蜂窝梁的弹性屈曲荷载公式,为实际设计提供参考,并且通过理论分析推导出适用于蜂窝梁的高厚比限值公式。以上研究成果,为蜂窝梁的局部稳定设计提供了理论依据,也为工程应用提供了参考。
[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.
【学位授予单位】：沈阳建筑大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU391
[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.
【学位授予单位】：沈阳建筑大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU391
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