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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。
By means of finite element analysis and full-scale model test, the method of longitudinal and transverse stiffener reinforcement for the large open web of H-beam is proposed. The width of the rectangular hole reaches 1 200 mm, which exceeds the current standard width of the hole of 750 mm. The width of the rectangular hole Height ratio less than or equal to 3, hole spacing greater than 2/3 hole width. By analyzing the width, thickness and extensional length of longitudinal and transverse stiffeners of H-beam, the reinforcement efficiency of longitudinal and transverse stiffeners is studied. The reinforcement of the openings can be obtained by using longitudinal stiffeners with the flange thickness, High and the same thickness with steel web, vertical and horizontal stiffeners should not be too wide reinforcement method. Reinforcement design of large openings steel beam should adopt finite element method to analyze its reinforcement effect. The test results show that it is safe and reliable to use this method to reinforce the steel girder with large open hole and is practically used in the super high-rise project.