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基于孔洞位置、数量、直径、间距以及是否配置加强筋等因素,进行了集中荷载作用下开孔RC梁承载力的试验研究。研究结果表明,在梁的纯弯段和剪弯段开孔对梁的承载力性能影响不同。在纯弯段开孔梁的开裂荷载显著减小;而在剪弯段开孔会使梁的极限承载力明显减小;双孔梁较单孔梁承载力损失更大,剪弯段开双孔除了能进一步减小梁开裂荷载及极限承载力外,能使梁出现明显的脆性破坏;随着梁开孔直径的增加,梁的极限承载力逐渐减小;梁开双孔时,增加两孔间的距离能使开双孔对梁所造成的承载力损伤显著降低;在孔洞周围布置加强筋后能够有效降低因开孔造成的极限承载力的损失,且其极限承载能力的降低值在10%以内。在试验研究的基础上,给出了开孔梁抗剪承载力的计算公式,可为开孔梁的设计及应用提供参考。
Based on the hole location, the number, the diameter, the spacing and whether to dispose the stiffener, the experimental research on the bearing capacity of open-ended RC beams under concentrated load was carried out. The results show that the pure beam bending and the bending of the curved section of the beam on the bearing capacity of different performance. The cracking load of the beam in the pure bending section decreases obviously, while the ultimate bearing capacity of the beam in the bending section decreases obviously. The bearing capacity of the double-girder beam is larger than that of the single-hole beam, In addition to the hole can further reduce the beam cracking load and ultimate bearing capacity, can make the beam obvious brittle failure; as the beam diameter increases, the ultimate bearing capacity of the beam decreases; beam double hole, increase the hole between the two Can reduce the damage caused by the opening of the double beam to the beam significantly. The reinforcement of the ribs around the hole can effectively reduce the ultimate bearing capacity loss caused by the opening, and the ultimate bearing capacity of the reduction of 10% Within. Based on the experimental study, the formula for calculating shear capacity of perforated beam is given, which can provide reference for the design and application of perforated beam.