薄壁矩形波纹腹板H型钢梁整体稳定性研究

发布时间：2018-08-08 14:36

【摘要】：本文根据波纹腹板型钢和冷弯薄壁型钢结构的受力特点和局限性,结合《结构用高频焊接薄壁H型钢》提出了一种新构件——薄壁波纹腹板H型钢梁,意在提高薄壁H型钢的整体稳定性。为了促进更多波纹在我国的全面推广,故将波纹设定为矩形波形。本文对于新构件整体稳定性的研究内容和结论主要有以下几点:1、本文对提出的新构件的截面几何尺寸初选的依据进行了详尽阐述,进而对此新构件的截面进行了设计,包括腹板高度、腹板厚度、波幅、波长、翼缘宽度、翼缘厚度等参数。笔者对所提出的新构件申请了实用新型专利,受理专利号为201620571726.5。2、推导简化了计算新型构件截面特性的计算公式,运用简化的公式计算了新型构件的截面特性,选取了《结构用高频焊接薄壁H型钢》中普通焊接薄壁H型钢梁的一组截面,对比了相同条件下两者的截面特性,发现新型构件的Iy和Wy均大于普通焊接薄壁H型钢梁,说明新型构件的侧向抗弯能力大于平腹板构件,其平面外刚度大幅度提高,故构件的平面外稳定性能好,抗压稳定性、抗侧向弯曲变形能力都得到了提高,最后依据相关规范要求对新型构件构造了一系列截面型号;3、采用ABAQUS有限元软件对提出的构件进行模型的建立,不考虑构件的初始缺陷,研究限定在弹性屈曲范围内,结合相应规范初选构件截面几何参数,设定其边界条件和载荷形式。通过不断变化构件的几何参数得出了各几何尺寸与新型构件整体失稳的临界屈曲荷载之间的关系曲线,研究结果表明:(1)腹板厚度越厚构件发生失稳时的临界屈曲荷载值越大,腹板厚度的增加可提高构件的整体稳定性;腹板高度越高构件的临界屈曲荷载值越大,且变化平缓,说明腹板高度增加可提高构件的整体稳定性;波幅的变化对构件的整体稳定性能影响不大;波长越长构件发生失稳时的临界屈曲荷载值越小,波长越长构件的整体稳定性越差;(2)翼缘宽度的增加使得构件的临界屈曲荷载值先逐渐增大到达一定数值后又下降,说明增大翼缘宽度可提高构件失稳的屈曲荷载,但达到一定数值会降低构件的屈曲荷载;翼缘厚度越厚构件发生失稳时的临界屈曲荷载值越大,适当增加翼缘厚度可一定程度提高构件的整体稳定性。4、本文为了进一步分析矩形波形的突出特点,在同等条件下对比了三角形波形和正弦形波形各自几何参数对其临界屈曲荷载值的影响规律,结果如下:(1)薄壁矩形波纹腹板H型钢梁在跨度5m～6m范围内其整体稳定性具有明显优势;(2)薄壁矩形波纹腹板H型钢梁在相同腹板厚度情况下发生整体失稳时的临界屈曲荷载值要高于三角形波形和正弦波形,临界屈曲荷载值提高约8%～9%;(3)薄壁矩形波纹腹板H型钢梁在腹板高度相同时临界屈曲荷载值要明显高于三角形波形和正弦波形,且在腹板高度为800mm以上时,这种差距更加明显,临界屈曲荷载值提高约15%～24%;(4)相比于三角形和正弦波纹来说波长对薄壁矩形波纹腹板H型钢梁的临界屈曲荷载没有明显的影响,相较于正弦波形而言,相同波长时薄壁矩形波形的临界屈曲荷载值提高约6%～17%,并且薄壁矩形波纹腹板H型钢梁在同等条件下随着波长的不断增加其构件的整体稳定性要优于三角形和正弦波形腹板H型钢梁;(5)在同等条件下,随着翼缘宽度的增加矩形波形构件发生整体失稳时的临界屈曲荷载值大于正弦波形和三角波形,其临界屈曲荷载值提高约10%;(6)在设计时,若需要宽翼缘的情况下可优先选择薄壁矩形波纹腹板H型钢梁,并且适当增加翼缘的厚度,可进一步提高构件整体稳定性;除了波幅这一参数外,薄壁矩形波纹腹板H型钢梁发生整体失稳的临界屈曲荷载较大,在相同参数变化过程中薄壁矩形波纹腹板H型钢梁构件发生整体失稳时的临界屈曲荷载值均明显高于三角形和正弦波纹。这是本文研究的重要结论。
[Abstract]:In this paper, according to the stress characteristics and limitations of corrugated web steel and cold formed thin-walled steel structure, a new component, thin wall corrugated web H steel beam, is put forward in combination with the high frequency welded thin-walled H steel with "structure". It is intended to improve the overall stability of thin wall H steel. In order to promote more wave pattern in our country, the ripple is set. It is a rectangular waveform. The main contents and conclusions of this paper are as follows: 1. This paper expounds the basis of the first selection of the geometric size of the new component, and then the section of the new component is designed, including the height of the web, the thickness of the web, the amplitude, the wavelength, the width of the flange, the flange thickness. The new component is applied to the new component, and the patent number is 201620571726.5.2. The calculation formula for calculating the cross section characteristic of the new component is simplified. The section characteristics of the new component are calculated by the simplified formula, and the high frequency welded thin-walled H steel > common welded thin wall H steel in the structure is selected. A group of sections of the beam are compared with the cross section characteristics under the same conditions. It is found that the Iy and Wy of the new component are larger than the ordinary welded thin-walled H type steel beams. It shows that the lateral bending ability of the new component is greater than that of the flat web member. The lateral stiffness of the new component is greatly improved, so the stability performance of the component is good, the compression stability and the lateral bending resistance change. The shape ability has been improved. Finally, a series of section models are constructed for the new component according to the requirements of the relevant specifications. 3, the ABAQUS finite element software is used to establish the model of the proposed component, without considering the initial defects of the components. The study is limited to the elastic buckling range, and the geometric parameters of the sections of the corresponding primary selected components are set. The relationship between the geometric size and the critical buckling load of the new component is obtained by changing the geometric parameters of the component. The results show that: (1) the thicker the thickness of the web, the greater the critical buckling load is, the increase of the thickness of the web can improve the whole structure of the component. The higher the height of the web, the greater the value of the critical buckling load and the slow change, which indicates that the increase of the height of the web can improve the overall stability of the component, and the change of the amplitude has little effect on the overall stability of the component; the longer the length of the component, the smaller the critical buckling load is, the longer the wavelength the longer the stability of the component is. The worse, (2) the increase of the flange width makes the critical buckling load of the component gradually increase to a certain value and then decrease. It is indicated that the buckling load of the member can be increased by increasing the flange width, but the buckling load of the member can be reduced by increasing the flange width, and the thicker the flange thickness, the greater the critical buckling load of the buckling load, the more suitable for the buckling load. When the flange thickness can be increased to a certain extent, the overall stability of the component can be improved to a certain extent. In order to further analyze the prominent characteristics of the rectangular waveforms, the influence of the geometric parameters of the triangular and sinusoidal waveforms on the critical buckling load values is compared under the same conditions. The results are as follows: (1) the thin-walled rectangular corrugated web H steel beam is in the following conditions. The overall stability has obvious advantages in the range of 5m ~ 6m span. (2) the critical buckling load of the thin-walled rectangular corrugated web H steel beam under the same thickness condition is higher than the triangle wave and the sine wave shape, the critical buckling load is raised about 8% to 9%, and (3) the thin-walled rectangular corrugated web H steel beam is high in the web. At the same degree, the critical buckling load is obviously higher than the triangle wave and the sine wave, and when the height of the web is above 800mm, the gap is more obvious, and the critical buckling load is increased by about 15% ~ 24%. (4) the critical buckling load of the thin-walled rectangular corrugated web H steel beam is not obvious compared to the triangle and the sinusoidal wave. Compared with the sinusoidal wave, the critical buckling load of the thin rectangular wave is about 6% ~ 17% at the same wavelength, and the thin-walled rectangular corrugated web H type steel beam is better than the triangle and the sine wave web H steel beam with the constant increase of the wavelength. (5) under the same condition, As the width of the flange increases, the critical buckling load of the rectangular wave member is greater than that of the sine wave and the triangle wave, and the critical buckling load is increased by about 10%. (6) when the wide flange is needed, the thin-walled rectangular corrugated abdominal H steel beam can be selected first, and the flange thickness can be increased properly. In addition to the amplitude, the critical buckling load of the thin-walled rectangular corrugated web H steel beam has a larger critical buckling load than the amplitude. The critical buckling load value of the thin-walled rectangular corrugated web H steel beam members during the whole instability is obviously higher than that of the triangle and the sine wave. This is an important conclusion of this study.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU392.1

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