【摘要】：波紋腹板H型鋼構(gòu)件是由波浪形式的鋼腹板與平翼緣通過高頻連續(xù)焊焊接而成的輕鋼型構(gòu)件。對于軸心受壓構(gòu)件而言,雖然由于腹板的褶皺作用,構(gòu)件在沿波折方向幾乎不能承受軸向壓力,但在另一個軸線方向的抗彎剛度卻有了較大的提升。目前國內(nèi)對波紋腹板H型鋼的軸心受壓構(gòu)件研究較少,這在很大程度上限制了波紋腹板H型鋼的發(fā)展。本文通過采用理論分析和有限元數(shù)值模擬,對波紋腹板H型鋼的軸心受壓構(gòu)件的整體穩(wěn)定性進(jìn)行了研究,參考了現(xiàn)行規(guī)范中的一些近似的處理方法和常用做法,對波紋腹板H型鋼柱的軸心受壓整體穩(wěn)定性提出了意見與建議。首先針對波紋腹板H型鋼的軸心受壓構(gòu)件,結(jié)合已有的理論和近似研究方法,提出了一種適用于推導(dǎo)波紋腹板H型鋼的換算長細(xì)比公式的簡化力學(xué)模型。利用上述模型,對波紋腹板H型鋼的換算長細(xì)比公式進(jìn)行了分析。利用波紋腹板H型鋼柱與格構(gòu)柱在力學(xué)性能上的相似性,提出了適用于波紋腹板H型鋼的換算長細(xì)比公式。采用一種適合用于有限元計(jì)算的柱簡化模型,通過變化長細(xì)比驗(yàn)證了本文推導(dǎo)公式的適用性。其次,通過有限元分析軟件對波紋腹板H型鋼的波紋形式、長細(xì)比、翼緣寬厚比、腹板高厚比以及波幅與波長比對構(gòu)件彎曲臨界屈曲荷載的影響情況進(jìn)行了分析。在考慮材料非線性和幾何非線性的雙重非線性的條件下,通過在輸出文件中寫入缺陷值,分析了整體初彎曲值對波紋腹板H型鋼的軸心受壓的極限荷載的影響情況。本文的主要研究成果如下:(1)建立了適用于研究波紋腹板H型鋼軸心受壓構(gòu)件的簡化模型;(2)推導(dǎo)并驗(yàn)證了適用于波紋腹板H型鋼的換算長細(xì)比公式,使得當(dāng)構(gòu)件應(yīng)用于工程實(shí)際后更加穩(wěn)定安全;(3)波紋腹板H型鋼軸心受壓構(gòu)件的承載力隨著長細(xì)比的增大而減小;(4)波紋腹板H型鋼軸心受壓構(gòu)件的四種波紋形狀對構(gòu)件的承載力影響較小,因此作為軸心受壓構(gòu)件的時候,不同的波紋形式可以互相等效替換;(5)波紋腹板H型鋼軸心受壓構(gòu)件的翼緣寬厚比的建議取值范圍為10～30;(6)波紋腹板H型鋼軸心受壓構(gòu)件的腹板高厚比的限值為425;(7)波紋腹板H型鋼軸心受壓構(gòu)件的波幅與波長比對構(gòu)件的承載力影響可以忽略不計(jì);(8)在考慮非線性作用下的波紋腹板H型鋼軸心受壓構(gòu)件的整體初彎曲值對波紋腹板H型鋼柱構(gòu)件極限承載力有一定的影響,但初彎曲值在長細(xì)比較小的構(gòu)件中的影響較大。(9)在實(shí)腹式H型鋼的幾何參數(shù)選擇范圍內(nèi),對波紋腹板H型鋼的極限承載力與實(shí)腹式H型鋼的極限承載力進(jìn)行對比分析,發(fā)現(xiàn)它們的降低系數(shù)的關(guān)系近乎呈現(xiàn)線性關(guān)系,通過線性擬合,得到了波紋腹板H型鋼柱與實(shí)腹式柱的折減系數(shù)。本文的相關(guān)結(jié)論,補(bǔ)充了波紋腹板H型鋼結(jié)構(gòu)的設(shè)計(jì)計(jì)算理論,為《波紋腹板鋼結(jié)構(gòu)應(yīng)用技術(shù)規(guī)程》(CEC5290-2011)的進(jìn)一步修訂完善提供了參考。
[Abstract]:Corrugated web H-shaped steel member is a light steel member which is welded by high frequency continuous welding between wavy steel web and flat flange. For axially compressed members, the flexural stiffness in the other axis has been greatly improved, although the axial pressure can hardly be withstood along the corrugated direction due to the web fold. At present, there are few researches on the axial compression members of corrugated web H-section in China, which limits the development of corrugated web H-section to a great extent. By means of theoretical analysis and finite element numerical simulation, this paper studies the overall stability of axial compression members of corrugated webs H-section steel, and refers to some approximate treatment methods and common methods in current codes. Comments and suggestions on the overall stability of corrugated webs H-shaped columns under axial compression are presented. In this paper, a simplified mechanical model is proposed to deduce the formula of the aspect ratio of corrugated web H-shaped steel, which is based on the existing theory and approximate research method, aiming at the axial compression member of corrugated web H-section steel. Based on the above model, the formula of conversion aspect ratio of corrugated web H-section steel is analyzed. Based on the similarity of mechanical properties between corrugated webs H-shaped steel columns and lattice columns, the conversion ratio formula for corrugated webs H-shaped steel is proposed. A simplified column model suitable for finite element calculation is adopted and the applicability of the derived formula is verified by changing the aspect ratio. Secondly, the influence of corrugated form, aspect ratio, flange width to thickness ratio, web height to thickness ratio and the ratio of wave amplitude to wavelength on the bending critical buckling load of corrugated web H-section steel is analyzed by finite element analysis software. Considering the double nonlinearity of material nonlinearity and geometric nonlinearity, the influence of global initial bending value on the axial ultimate load of corrugated web H-section steel is analyzed by writing the defect value in the output file. The main research results of this paper are as follows: (1) A simplified model is established for the study of corrugated webs H-section steel axial compression member; (2) deduces and verifies the conversion slenderness ratio formula suitable for corrugated web H-section steel, which makes the component more stable and safe when it is applied in engineering practice; (3) the bearing capacity of corrugated webs H-shaped steel axial compression members decreases with the increase of slenderness ratio; (4) the four shapes of corrugated webs H-shaped steel axial compression members have little influence on the bearing capacity of the members, so different corrugated forms can be replaced each other as axial compression members. (5) the suggested ratio of flange width to thickness of corrugated webs H-shaped steel axial compression members is 10 / 30, (6) the limiting value of web height to thickness ratio of corrugated H-shaped steel axial compression members is 425; (7) the influence of wave amplitude to wavelength ratio on the bearing capacity of H-section steel axial compression members with corrugated webs can be neglected. (8) the initial bending value of the corrugated web H-shaped steel axial compression member has certain influence on the ultimate bearing capacity of corrugated web H-shaped steel column member. But the initial bending value has a great influence on the members with small length and fineness. (9) in the range of geometric parameters selection, the ultimate bearing capacity of corrugated web H-section steel and the ultimate bearing capacity of full-web H-section steel are compared and analyzed. It is found that the relationship between the decreasing coefficients of the corrugated webs and the solid web columns is almost linear. By linear fitting, the reduction coefficients of corrugated webs H-shaped columns and solid web columns are obtained. The conclusion of this paper complements the design and calculation theory of corrugated webs H-section steel structure, and provides a reference for the further revision and perfection of CEC5290-2011 (Technical Specification for the Application of corrugated Web Steel structures).
【學(xué)位授予單位】：西南石油大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU392.1

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