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本文基于116个轴心局压试件的试验研究,给出了局压破坏的三种基本形态及其产生的条件;给出了在不同面积比和不同形状垫板下的轴心局压的开裂和破坏强度变化规律,以及不同形状垫板下楔形体特征及其形成的条件,并将TJ10—74规范的平方根公式及国外著名的立方根公式与试验结果进行了比较。明确面积比A_d/Ac是影响局压破坏形态、变形性质及强度规律的最主要和最基本的因素。为研究混凝土局部承压的工作机理、破坏机构和建立计算理论提供了依据。
In this paper, based on the experimental study of 116 axial compression specimens, three basic forms of the local pressure failure and the conditions for its production are given; and the axial center pressures under different area ratios and different shapes of the backing plate are given. The law of cracking and breaking strength change, and the characteristics of wedges under different shapes and their forming conditions were compared. The square root formula of TJ10-74 norm and the famous cube root formula abroad were compared with the test results. It is clear that the area ratio A_d/Ac is the most important and basic factor influencing the failure mode, deformation properties and strength law of the local pressure. It provides the basis for studying the working mechanism of the partial pressure of concrete, the destruction mechanism and the establishment of calculation theory.