钢筋活性粉末混凝土简支梁正截面受力性能试验研究

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。图9表10参11

Experimental research on mechanical performance of normal section of reinforced reactive powder concrete beam

The compressive and tensile stress-strain relationships were determined through the compressive test and tensile test of reactive powder concrete prisms. The ultimate strain at the compressive edge, the strain distribution on sections of the test beams, and the cracking moment, ultimate moment, deformation and distribution of cracks were studied through six test beams. According to The test results, the ultimate strain at the compressive edge of specimen was 5500×10-6 and the crack strain at bending section was 750×10-6. The test results indicate that the favorable influence of longitudinal reinforcement on calculation formula of plastic coefficient should be considered. The formula for the calculation of bending capacity of reinforced reactive powder concrete beam considering the contribution of the tensile stress of reactive powder concrete was proposed. The calculation method of stiffness and crack width were given based on the test results. These results provide theoretical basis for design of reinforced reactive powder concrete beam.11Refs.In Chinese.