| 摘要: |
| 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. |
| 关键词: 机械式双向拉伸仪 材料试验 特制混凝土 双向拉伸强度 Hill理论 计算式 |
| DOI： |
| 分类号:TP528.1,TU039 |
| 基金项目:国家自然科学基金资助项目(51308210) |
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| Study on the biaxial tensile strength of special made concrete |
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Chen Jiguang, Chen Leqiu, Tong Xiaolong
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Department of Construction & Engineering,Hunan Institute of Science and Technology, Yueyang 414006,China
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| Abstract: |
| Special concrete specimens were made of coarse aggregate consisted of crushed limestone whose particle diameters ranged from 5 to 7mm. The uniaxial and biaxial tensile strength testing results were obtained by material tests using mechanical biaxial stretching equipment; meanwhile, theoretical values were calculated using the formula derived from the Hill Theory. The results show that the specimens’ biaxial tensile strength is 15%-30% lower than that of uniaxial. Theoretical values fit well with testing results, with maximum difference lower than 11%. This conclusion is of great significance to the design of plate and shell concrete structure which is used under complex stresses. |
| Key words: mechanical biaxial stretching equipment material test special concrete biaxial tensile strength Hill theory formula |
