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本文基于各种不同形状垫板、不同面积比混凝土试件轴心局压下的N—⊿、N—⊿_h关系,以及试件表面应变场的测定,给出了各种面积比时楔形体及母楔体的N—⊿、N—⊿_h曲线及其在中小型面积比时的四个工作阶段;给出了混凝土试件轴心局压时楔形体与其周围混凝土变形关系;给出了侧表面纵、横向应变分布,峰值区的位置以及楔形体与应变峰值区的关系。为研究混凝土局部承压的工作基理、破坏机构和建立计算理论提供依据。
In this paper, based on the relationship between N-⊿, N-⊿_h and the measurement of the surface strain field of specimens with various shapes of backing plates, concrete specimens of different area ratios, the wedges are given in various area ratios. And the N-⊿, N-⊿_h curve of the female wedge and its four working stages in the medium to small area ratio; the relationship between the deformation of the wedge and the surrounding concrete during the axial compression of the concrete specimen is given; The longitudinal and lateral strain distribution of the lateral surface, the position of the peak zone, and the relationship between the wedge and the strain peak area. It provides the basis for studying the working principle of the partial pressure of concrete, the destruction mechanism and the establishment of calculation theory.