钢梁腹板开大洞加固研究
- 摘 要
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（1 上海联创建筑设计有限公司， 上海 200135； 2 华东建筑设计研究院有限公司， 上海 200002）
［摘要］通过有限元分析及足尺模型试验研究，提出了H型钢梁腹板大开洞采用纵、横加劲肋加固方法，矩形洞口宽度达到1 200mm，超出现行规范洞口宽度限值750mm，矩形洞口宽高比小于等于3，洞口间距大于2/3洞宽。通过分析H型钢梁纵、横加劲肋的宽度、厚度及外伸长度，研究了纵、横加劲肋的加固效率，提出了洞口加固可采用纵向加劲肋同钢梁翼缘厚度，横向加劲肋贯通梁高且厚度同钢梁腹板，纵、横加劲肋不宜过宽的加固方法。大开洞钢梁加固设计宜采用有限元法分析其加固效果。试验结果表明，采用本文方法加固大开洞钢梁是安全可靠的，并在超高层工程中得到实际应用。［关键词］腹板矩形开洞钢梁; 超大洞口; 加强分析; 试验研究中图分类号：TU317 文献标识码：A 文章编号：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
作者简介：魏丰登，硕士，一级注册结构工程师，高级工程师，Email：weifengdeng@udg.comc.cn。
