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根据棱柱体试件的受压试验结果,得到了常温养护下活性粉末混凝土(RPC)的优选配合比和基于该配合比的受压应力-应变曲线上升段方程。根据5根钢筋RPC梁受弯性能试验,获得了这类梁纯弯区段在各级荷载作用下受压边缘压应变及应变沿梁高的分布、开裂荷载和极限荷载、各级荷载作用下的变形及裂缝分布与开展,由试验数据可知,相同条件下这类梁的变形及裂缝宽度均比普通钢筋混凝土梁稍大。通过假定用于受弯承载力计算的RPC受压应力-应变曲线关系下降段为直线,结合试验数据分析,获得与极限压应变相对应的RPC压应力的大小,从而得到RPC应力-应变全曲线方程。基于RPC的受压应力-应变全曲线方程建立了RPC梁正截面承载力计算方法。同时基于试验结果给出了在使用荷载作用下这类梁刚度和裂缝的计算方法。
According to the compressive test results of prismatic specimens, the optimal mixing ratio of activated powder concrete (RPC) under normal temperature and the equation of rising section of compressive stress-strain curve based on the mixing ratio were obtained. According to the bending test of five reinforced RPC beams, the distributions of the compressive edge strain and strain along the beam in the purely curved section of the beam under all loadings are obtained. The cracking load and the ultimate load, the deformation under various loadings And crack distribution and development, the experimental data show that under the same conditions, such beam deformation and crack width slightly larger than ordinary reinforced concrete beam. Based on the experimental data analysis, the compressive stress of RPC corresponding to the ultimate compressive strain is obtained by assuming that the descending section of RPC compressive stress-strain curve is a straight line, which is assumed to be used for flexural capacity calculation, so as to obtain the full stress-strain curve of RPC equation. Based on the compressive stress-strain curve equation of RPC, a method to calculate the normal section bearing capacity of RPC beams is established. At the same time, based on the test results, the calculation method of the stiffness and the crack of the beam under the load is given.