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将超弹性形状记忆合金(简称SMA)绞线作为主筋埋入到混凝土梁中,制成SMA混凝土梁。采用跨中单点加载试验对其进行力学性能测试,并利用同尺寸、同配筋率的钢筋混凝土梁作为参照,比较了各试验梁的承载力、残余变形和残余裂缝,分析了SMA的预应力及SMA与混凝土的粘结情况对试验梁力学性能的影响。结果表明,超弹性SMA绞线可以减小混凝土梁的残余变形和残余裂缝,提高混凝土梁的自修复能力。与普通钢筋混凝土梁相比,开裂后SMA混凝土梁的承载力增加的幅度更大,且粘结情况对梁的承载力有较大的影响。此外,对于无粘结SMA混凝土梁,对SMA绞线施加预应力可以提高混凝土梁的承载力和耗能能力。
The super elastic shape memory alloy (referred to as SMA) twisted wire as the main reinforcement embedded in concrete beams, made of SMA concrete beams. The mid-span single-point loading test was used to test the mechanical properties of the SMA. Using the same size and same reinforcement ratio of reinforced concrete beam as a reference, the bearing capacity, residual deformation and residual cracks of each test beam were compared. Effect of Stress and Bonding of SMA with Concrete on Mechanical Behaviors of Test Beams. The results show that superelastic SMA strands can reduce the residual deformation and residual cracks of concrete beams and improve the self-healing ability of concrete beams. Compared with ordinary reinforced concrete beams, the bearing capacity of SMA concrete beams increases more after cracking, and the bonding condition has a greater influence on the bearing capacity of beams. In addition, for unbonded SMA concrete beams, prestressing the SMA strands can increase the bearing capacity and energy dissipation of concrete beams.