【摘要】：當(dāng)冷彎薄壁型鋼C形梁跨度較小即短梁時(shí),發(fā)生受剪破壞。本文在冷彎薄壁型鋼C形梁受剪試驗(yàn)的基礎(chǔ)上,驗(yàn)證了有限元方法的正確性,然后進(jìn)行了大量有限元變參數(shù)分析,最終對(duì)冷彎薄壁型鋼C形梁腹板的剪切應(yīng)力進(jìn)行折算,提出了冷彎薄壁型鋼C形梁受剪承載力的計(jì)算方法。本文首先對(duì)冷彎薄壁型鋼C形梁受剪試驗(yàn)進(jìn)行了簡(jiǎn)要介紹,包括試驗(yàn)試件設(shè)計(jì)、試驗(yàn)裝置、加載制度、試件破壞特征、荷載—位移曲線以及受剪承載力等內(nèi)容。然后采用ABAQUS有限元軟件,通過(guò)數(shù)值模擬分析了已有試驗(yàn)中的11個(gè)冷彎薄壁型鋼C形梁試件的受剪性能。將有限元計(jì)算結(jié)果與試驗(yàn)結(jié)果進(jìn)行了對(duì)比分析,包括受剪承載力、荷載—位移曲線、試件破壞特征等,對(duì)比結(jié)果表明有限元分析結(jié)果與試驗(yàn)結(jié)果二者較為吻合,驗(yàn)證了有限元方法的正確性和可行性。在此基礎(chǔ)之上,采用相同的有限元方法,分別對(duì)試件的腹板高厚比h/t、腹板厚度t、剪跨比a/h及鋼材強(qiáng)度四個(gè)因素對(duì)冷彎薄壁型鋼C形梁受剪性能的影響進(jìn)行有限元變參數(shù)分析。分析表明:冷彎薄壁型鋼C形梁的受剪承載力和剛度隨著腹板厚度的增加而有明顯的增加;但是,當(dāng)冷彎薄壁型鋼C形梁的腹板厚度過(guò)薄則易導(dǎo)致C形梁發(fā)生翼緣局部壓曲。此外,增大腹板的高厚比,冷彎薄壁型鋼C形梁受剪承載力也會(huì)有很大提高。梁剪跨比改變主要影響的是冷彎薄壁型鋼C形梁破壞特征。鋼材強(qiáng)度增強(qiáng)也會(huì)使冷彎薄壁型鋼C形梁的受剪承載力有很大提高,但是其對(duì)冷彎薄壁型鋼C形梁的剛度幾乎沒(méi)有影響。最后,在大量有限元變參數(shù)分析的基礎(chǔ)上,考慮冷彎薄壁型鋼C形梁的翼緣和卷邊對(duì)腹板的影響,對(duì)腹板剪切應(yīng)力進(jìn)行修正。把冷彎薄壁型鋼C形梁的受剪承載力計(jì)算公式按照受力狀態(tài)分為受剪屈服、彈性剪切屈曲以及非彈性剪切屈曲三種承載力公式,并將理論計(jì)算結(jié)果、有限元結(jié)果和試驗(yàn)結(jié)果進(jìn)行對(duì)比,驗(yàn)證了修正理論公式的正確性,為冷彎薄壁型鋼C形梁受剪承載力計(jì)算提供了設(shè)計(jì)依據(jù)。
[Abstract]:The shear failure occurs when the span of C beam is smaller than that of short beam. In this paper, based on the shear test of cold-formed thin-walled steel C-shaped beam, the correctness of finite element method is verified, and then a large number of finite element variable parameter analysis is carried out, finally, the shear stress of the cold-formed thin-walled steel C-shaped beam web plate is converted. A method for calculating the shear capacity of C-shaped cold-formed thin-walled steel beams is presented. In this paper, the shear test of cold-formed thin-walled steel C-shaped beam is introduced briefly, including the design of test specimen, test device, loading system, failure characteristics of specimen, load-displacement curve and shear bearing capacity, etc. Then the shear behavior of 11 cold-formed thin-walled steel C-shaped beam specimens in existing tests is analyzed by numerical simulation using ABAQUS finite element software. The finite element analysis results are compared with the test results, including shear capacity, load-displacement curve, failure characteristics of the specimen, etc. The results show that the finite element analysis results are in good agreement with the test results. The correctness and feasibility of the finite element method are verified. On this basis, the same finite element method is used to analyze the ratio of height to thickness of the web, the thickness of the web, and the thickness of the web. The influence of shear span ratio (a / h) and steel strength on shear behavior of cold-formed thin-walled steel C-beam is analyzed by finite element method. The analysis shows that the shear capacity and stiffness of cold-formed thin-walled C-shaped beams increase obviously with the increase of web thickness, but when the web thickness of cold-formed thin-walled C-shaped beams is too thin, the flange local compression will occur easily. In addition, the shear capacity of cold-formed thin-walled C-beam can be greatly improved by increasing the ratio of high to thick web. The failure characteristics of cold-formed thin-walled C-beam are mainly affected by the change of shear span ratio. The strength of steel also increases the shear capacity of cold-formed thin-walled steel C-beam, but it has little effect on the stiffness of cold-formed thin-walled C-beam. Finally, on the basis of a large number of finite element variable parameter analysis, considering the influence of flange and crimping on web plate of cold-formed thin-walled steel C-shaped beam, the shear stress of web plate is corrected. The formulas for calculating the shear capacity of cold-formed thin-walled steel C-shaped beams are divided into three kinds of bearing capacity formulas: shear yield, elastic shear buckling and inelastic shear buckling according to the stress state, and the theoretical calculation results are given. By comparing the finite element results with the experimental results, the correctness of the modified theoretical formula is verified, which provides the design basis for the calculation of the shear capacity of the cold-formed thin-walled steel C-shaped beams.
【學(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TU392.1

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 李相超;萬(wàn)紅霞;;冷彎C型鋼梁在雙向彎曲情況下的屈曲模態(tài)分析[J];河南城建學(xué)院學(xué)報(bào);2016年04期

2 魏建軍;宋生志;;三角形空翼緣梁的極限承載力試驗(yàn)研究[J];土木建筑與環(huán)境工程;2014年03期

3 田微;郭成喜;;冷彎槽鋼承受集中荷載時(shí)腹板壓屈的數(shù)值分析[J];鋼結(jié)構(gòu);2013年02期

4 劉晶波;徐宏艷;李杰;胡永生;;冷彎薄壁C形開(kāi)孔鋼梁承載力有限元分析[J];施工技術(shù);2011年14期

5 石宇;周緒紅;苑小麗;聶少鋒;;冷彎薄壁卷邊槽鋼組合工字梁極限承載力計(jì)算的有效寬度法[J];土木工程學(xué)報(bào);2011年06期

6 苗二萍;劉小峰;彭奕亮;;冷彎薄壁C形鋼梁彎曲變形分析[J];建筑結(jié)構(gòu);2010年02期

7 仇保興;;從綠色建筑到低碳生態(tài)城[J];城市發(fā)展研究;2009年07期

8 張耀春;王海明;;冷彎薄壁型鋼C形截面構(gòu)件受彎承載力試驗(yàn)研究[J];建筑結(jié)構(gòu)學(xué)報(bào);2009年03期

9 董軍;陸曦;;中間加勁C型鋼構(gòu)件壓彎滯回性能非線性模擬[J];地震工程與工程振動(dòng);2008年06期

10 石永久;程明;王元清;;鋁合金梁中腹板剪切屈曲的設(shè)計(jì)方法[J];清華大學(xué)學(xué)報(bào)(自然科學(xué)版);2008年06期

相關(guān)碩士學(xué)位論文 前10條

1 胡杰文;冷彎薄壁型鋼受彎構(gòu)件的屈曲模態(tài)研究及其在穩(wěn)定承載力設(shè)計(jì)方法中的應(yīng)用[D];重慶大學(xué);2015年

2 孫國(guó)軍;C型冷彎薄壁鋼構(gòu)件的靜、動(dòng)態(tài)畸變屈曲機(jī)理研究[D];寧波大學(xué);2015年

3 章陽(yáng);冷彎薄壁C形鋼受彎構(gòu)件畸變屈曲和局部屈曲性能研究[D];重慶大學(xué);2014年

4 梁嘉;純剪切狀態(tài)下蜂窩梁腹板的局部穩(wěn)定性分析[D];湖南大學(xué);2013年

5 江開(kāi)富;不銹鋼工字形薄腹板梁抗剪承載力分析[D];西安建筑科技大學(xué);2009年

6 呂金寶;冷彎薄壁卷邊槽鋼梁開(kāi)圓孔腹板穩(wěn)定性能研究[D];西安建筑科技大學(xué);2009年

7 孫亞楠;壁厚小于2mm冷彎薄壁型鋼受彎構(gòu)件承載力試驗(yàn)研究及理論分析[D];西安建筑科技大學(xué);2008年

8 廖芳芳;550MPa高強(qiáng)冷彎薄壁型鋼受彎構(gòu)件受力性能試驗(yàn)與理論研究[D];西安建筑科技大學(xué);2007年

9 陸國(guó)威;新型輕鋼龍骨結(jié)構(gòu)多層住宅技術(shù)經(jīng)濟(jì)性研究[D];武漢理工大學(xué);2005年

10 陳莊;輕鋼住宅結(jié)構(gòu)體系的研究與應(yīng)用[D];東南大學(xué);2005年

，

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