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已有研究发现植筋混凝土梁疲劳破坏时存在植筋端头处产生受剪斜裂缝,导致脆性破坏的问题,针对此问题提出了在植筋端头设置箍筋这一构造优化措施。通过试验和数值模拟分析了7组不同植筋深度下构造改良前后植筋梁的极限承载力、挠度、植筋应变等力学性能。结果表明:在植筋混凝土梁的植筋端头设立箍筋可以有效提高植筋混凝土梁的极限承载力和极限变形能力。在保证原设计承载力和延性的基础上,实际施工中可以适当减小(2~3)d(d为植筋直径)的植筋深度使植筋端头位于原有构件箍筋处,从而减少植筋端头剪应力的产生,防止脆性破坏。
It has been found that the fatigue damage of anchorage-reinforced concrete beams results in the problem of cracks and inclined cracks at the ends of anchorage tendons, resulting in brittle failure. In view of this problem, a structural optimization measure of placing stirrups at the anchorage ends is proposed. The mechanical properties such as ultimate bearing capacity, deflection and anchorage strain of anchorage beam before and after structural improvement at seven different planting depths were analyzed through experiments and numerical simulation. The results show that setting stirrups on the anchorage ends of anchorage-reinforced concrete beams can effectively improve the ultimate bearing capacity and ultimate deformation capacity of anchorage-reinforced concrete beams. On the basis of ensuring the original design bearing capacity and ductility, the planting depth (2 ~ 3) d (d is the planting diameter) can be appropriately reduced in the actual construction so that the planting bar ends are located at the original member stirrups, thus Reduce the stress generated on the anchorage tip, to prevent brittle failure.