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进行10个足尺试验,研究加强切口工字钢梁的强度和性能。试验参数包括:纵向、横向加劲肋长度,纵向、横向加劲肋组合形式,两侧横向加劲肋,切口深度和长度等。不设加劲肋的切口梁试件,在切口处发生腹板的局部屈曲;仅设纵向加劲肋的切口梁试件,一般在最大弯矩处梁截面先弯曲屈服,而后在纵向加劲肋和梁截面顶翼缘之间的切口端部腹板发生破坏;设置纵、横加劲肋的试件,一般在最大弯矩处梁截面先弯曲屈服,而后受荷位置附近翼缘发生局部屈曲。试验结果表明,加强措施能显著提高切口梁的承载力,且切口深度和长度均能影响加强切口梁的性能和强度。基于试验数据,对现有加强措施提出一些改进,考虑了各种切口的影响。为扩大加强措施的适用范围,基于更多切口形式,进行数值研究。
Ten full-scale tests were conducted to study the strength and performance of the cut I-beam. Test parameters include: longitudinal, transverse stiffener length, vertical and horizontal stiffener combinations, lateral stiffeners on both sides, depth and length of incision. In the case of a notched beam specimen with stiffeners, local buckling of the web occurs at the notched portion; for a notched beam specimen provided with longitudinal stiffeners, the beam section is first bent and yielded at the maximum bending moment and then flexed in the longitudinal stiffeners and beams The specimens of the longitudinal and transverse stiffeners are usually bent and yielded at the maximum bending moment and the local buckling of the flange near the load-bearing position occurs. The experimental results show that the reinforcement measures can significantly improve the bearing capacity of the notched beams, and the depth and length of the incisions can affect the performance and strength of the notched beams. Based on the experimental data, some improvements were made to the existing reinforcement measures, taking into account the effects of various incisions. To expand the scope of application of the reinforcement measures, numerical studies were conducted based on more cutting patterns.