鋼梁腹板開大洞加固研究
魏豐登1，陸道淵2
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（1 上海聯(lián)創(chuàng)建筑設(shè)計有限公司， 上海 200135； 2 華東建筑設(shè)計研究院有限公司， 上海 200002）
［摘要］通過有限元分析及足尺模型試驗(yàn)研究，提出了H型鋼梁腹板大開洞采用縱、橫加勁肋加固方法，矩形洞口寬度達(dá)到1 200mm，超出現(xiàn)行規(guī)范洞口寬度限值750mm，矩形洞口寬高比小于等于3，洞口間距大于2/3洞寬。通過分析H型鋼梁縱、橫加勁肋的寬度、厚度及外伸長度，研究了縱、橫加勁肋的加固效率，提出了洞口加固可采用縱向加勁肋同鋼梁翼緣厚度，橫向加勁肋貫通梁高且厚度同鋼梁腹板，縱、橫加勁肋不宜過寬的加固方法。大開洞鋼梁加固設(shè)計宜采用有限元法分析其加固效果。試驗(yàn)結(jié)果表明，采用本文方法加固大開洞鋼梁是安全可靠的，并在超高層工程中得到實(shí)際應(yīng)用。［關(guān)鍵詞］腹板矩形開洞鋼梁; 超大洞口; 加強(qiáng)分析; 試驗(yàn)研究中圖分類號：TU317 文獻(xiàn)標(biāo)識碼：A 文章編號：1002-848X(2015)21-0058-05
Strengthening study of steel beam with large holes in webWei Fengdeng1, Lu Daoyuan2(1 United Design Group Co., Ltd., Shanghai 200135, China; 2 East China Architectural Design & Research Institute, Shanghai 200002, China)Abstract: Through the finite element analysis and full scale model experimental research, strengthening method with longitudinal and transverse stiffening ribs on H-shaped steel beam with large holes in web was proposed. The width of the rectangular hole reaches 1 200mm which is beyond the current specification hole width limit value of 750mm, and the width-height ratio of rectangular hole is less than or equal to 3 while hole spacing is larger than 2 / 3 hole width. Through the analyses of the width, thickness and overhang length of longitudinal and transverse stiffening ribs for H-shaped steel beam, strengthening efficiencies of longitudinal and transverse stiffening ribs were studied. The strengthening method of holes was proposed that the longitudinal stiffening rib thickness could equals to steel beam flange thickness, that transverse stiffening rib could penetrate along the beam height and had identical thickness as steel beam web, and that longitudinal and transverse stiffening ribs should not be too wide. Large hole strengthening design of steel beam should adopt finite element method to analyze the strengthening effects. Experimental results show that strengthening the steel beam with large holes with above method is safe and reliable, which is applied in super high-rise building project.Keywords: steel beam with large rectangular holes in web; large hole; strengthening analysis; experimental research
作者簡介：魏豐登，碩士，一級注冊結(jié)構(gòu)工程師，高級工程師，Email：weifengdeng@udg.comc.cn。
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