配筋梯度混凝土梁刚度实用计算方法

Flexural stiffness calculation method for reinforced gradient concrete beams consisting of normal and high strength concrete

摘要:

为探索由受压区采用高强高性能混凝土、拉区采用普通混凝土形成的配筋梯度混凝土受弯构件的变形性能,开展了三分点加载下该类简支梁试验．报道了配筋梯度混凝土简支梁截面应变与挠度试验结果,与仿真分析结果进行对比．基于试验结果,揭示了使用荷载下该类梁压区边缘混凝土平均应变与外荷载的线性发展规律,给出该类梁压区边缘混凝土平均应变综合系数计算公式,结合裂缝发展与截面曲率分析,提出配筋梯度混凝土矩形截面受弯结构构件短期刚度和长期刚度实用计算方法．

Abstract:

The reinforced gradient concrete beams consist of normal and high strength concrete, in which the compressed zone is made of high strength concrete, and the tensile one is made of normal strength concrete. Experiment on these simply supported beams with two-point loading was carried out, and the test results of strains and deflections of the beams under short-term load were verified and compared with those of nonlinear analysis. It revealed that the average strain at the outer fiber in the compressive zone increased linearly with the increase of external loading. Thus, the general coefficient of average compressive strain at the outer fiber was introduced, and its calculated equation was proposed. Based on the analysis of crack development and curvature of cross section, the calculation method on the immediate and long-term stiffness was proposed for the reinforced gradient concrete flexural member with rectangle section.