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通过轴压和轴拉试验,得到了活性粉末混凝土受压和受拉应力-应变全曲线方程。通过6根钢筋活性粉末混凝土梁受弯性能试验,得到了此类梁在各级荷载作用下纯弯区段受压边缘压应变及应变沿梁高的分布,获得了试验梁的开裂弯矩和极限弯矩,考察了试验梁的变形及裂缝分布与开展。试验结果表明:钢筋活性粉末混凝土试验梁受压边缘极限压应变为5500×10-6,纯弯区段开裂应变为750×10-6,截面抵抗矩塑性影响系数计算应考虑纵向受拉钢筋的有利影响。建立了考虑截面受拉区拉应力贡献的正截面承载力计算公式和反映钢筋活性粉末混凝土梁自身受力特点的刚度及裂缝宽度计算方法,可供钢筋活性粉末混凝土梁设计时参考。
By axial compression and biaxial pull test, the stress-strain curve of reactive powder concrete is obtained. Through the bending test of 6 reinforced concrete beams with reactive reinforcement, the compressive edge strain and strain along the beam height at pure bending section of such beam are obtained, and the cracking moment and The ultimate bending moment, the deformation of test beam and the distribution and development of cracks were investigated. The experimental results show that the compressive edge ultimate compressive strain of the reinforced concrete reactive beam concrete test beam is 5500 × 10-6, the crack strain of the pure bending section is 750 × 10-6, and the influence coefficient of plastic moment of moment resisting section should be taken into account. Beneficial effect The calculation formula of bearing capacity of normal cross section considering the tensile stress of section tensile zone and the calculation method of stiffness and crack width reflecting the self-bearing feature of reinforced reactive powder concrete beam are established. It can be used as a reference in design of reinforced reactive concrete beam.