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通过对12根不同再生骨料取代率配置500 MPa级钢筋的混凝土柱受力性能进行试验,分析再生混凝土柱的受压构件破坏形态、构件侧向挠度曲线、混凝土应变、钢筋应变等特征。将试验结果与按规范确定的承载力进行对比。研究结果表明,再生混凝土柱的破坏过程、形态、跨中侧向挠度曲线、混凝土应变、钢筋应变与普通混凝土区别不明显,取代率对柱的承载力影响不大。GB 50010—2010《混凝土结构设计规范》规定计算的受压承载力与试验结果符合良好,500 MPa级钢筋在再生混凝土柱中与混凝土协同工作性能较好,其抗拉强度和抗压强度均能得到充分发挥。在受压承载力计算中,500 MPa级钢筋的抗拉和抗压强度的设计值按GB 50010—2010规定取值均有较大安全储备。
The behavior of concrete columns with 500 MPa steel bars replaced by 12 recycled aggregates was tested. The failure modes, the lateral deflection curves of members, the strain of concrete and the strain of rebar were analyzed. Compare the test results with the load-bearing capacity determined according to the specifications. The results show that the failure process, shape, mid-span deflection curve, concrete strain and steel bar strain of recycled concrete columns are not obviously different from ordinary concrete, and the substitution rate has little effect on the bearing capacity of columns. GB 50010-2010 “Design Code for Concrete Structure” to calculate the compressive carrying capacity in good agreement with the test results, 500 MPa class reinforced concrete columns in the regeneration of concrete columns work well together, the tensile strength and compressive strength Get full play. In the calculation of compressive bearing capacity, the design value of tensile strength and compressive strength of 500 MPa grade steel should have greater safety reserve according to the provisions of GB 50010-2010.