高强钢筋活性粉末混凝土简支梁刚度试验研究

在8根高强钢筋活性粉末混凝土简支梁受弯试验的基础上,通过改变试验梁的纵筋率、钢筋等级等因素,分析试验梁的承载性能和变形特点。结果表明,随着配筋率和钢筋等级的提高,试验梁的承载力和整体刚度也相应提高,延缓了纵筋进入塑性阶段的时间,有效约束裂缝的发展,降低梁在加载阶段的挠度。根据高强钢筋活性粉末混凝土梁自身受力特点建立抗弯刚度计算公式,并将计算值与试验值进行对比,结果表明两者吻合良好,可供高强钢筋活性粉末混凝土梁设计参考。

EXPERIMENTAL RESEARCH ON STIFFNESS OF HIGH-STRENGTH REINFORCED REACTIVE POWDER CONCRETE SIMPLE BEAM

Based on bending test of eight high strength reinforced reactive powder concrete simple beams by changing the longitudinal rebar ratio and rebar grade of test beams,it was analyzed the load-bearing properties and deformation characteristics of the test beams. The results showed that with the reinforcement ratio and rebar grade were increased,the bearing capacity and the overall stiffness of the test beams also were increased; slowed the longitudinal reinforcement getting into the plastic stage,restrained the development of cracks effectively,reduced the beam deflection at load stage. According to the forced characteristics of high-strength reinforced reactive powder concrete beams,bending stiffness calculation formulas were set up,through which calculated values agreed well with the experimental values,which provided a reference for design of high strength reinforced reactive powder concrete beam.