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以粒径为5~7 mm的石灰岩碎石为粗骨料,拌制成一种特制混凝土试件.采用机械式双向拉伸仪进行材料试验,得到了这种混凝土的单、双向拉伸强度试验值;同时,根据Hill理论推导的计算式进行了理论计算.结果表明,混凝土的双向拉伸强度比其单向拉伸强度低15%~30%,计算值与试验值吻合良好,最大差别在11%以内.这对于复杂应力作用下的混凝土板、壳结构设计来说,具有重要意义.
The limestone with particle size of 5 ~ 7 mm was used as coarse aggregate, which was then mixed into a special concrete specimen.The mechanical tests were carried out by means of a mechanical biaxial stretching apparatus, and the single and the biaxial tensile strength The theoretical calculation is carried out according to the calculation formula derived from Hill theory.The results show that the biaxial tensile strength of concrete is 15% -30% lower than that of uniaxial tensile strength, the calculated values agree well with the experimental values, the maximum difference Within 11%, which is of great significance to the design of concrete slab and shell structure under the action of complex stress.