Strength without Size Effect and Formula of Strength for Concrete and Natural Marble

Materials

Maohong Yu¹  Xiaochun Li²  Yu Zhang³  Guangchun Zhou³  Yan Zhao⁴  Jun Shi⁵ 

[1] Department of Civil Engineering, Xi’an Jiaotong University, Xi’an 710049, China;Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Harbin 150090, China;Key Lab of Structures Dynamic Behavior and Control of China Ministry of Education, School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China;Key Laboratory of Earthquake Engineering and Engineering Vibration, Institute of Engineering Mechanics, China Earthquake Administration, Harbin 150080, China;School of Transportation Science and Engineering, Harbin Institute of Technology, Harbin 150090, China;

关键词: essential strength;    formula of strength;    stressing state;    specimen;    concrete;    marble;   

DOI  :  10.3390/ma12172685

来源: DOAJ

【 摘 要 】

Throughout the several-hundred-year-long history of the concept of strength, inaccurate material strength as a result of the size effect and the inconsistency of strength theories have been two continuous and challenging issues, and have even been taken to be inherent attributes of material strength. Applying the structural stressing state theory and method, this study experimentally investigates the uniaxial load-bearing process of concrete specimens and reveals their stressing state mutation features at specific load levels. Exploration of this general feature resulted in the discovery of essential strength, which is basically without size effect. Then, biaxial and triaxial experiments with concrete specimens were conducted in order to obtain the results for various combinations of principal stresses on essential strength. Consequently, according to Yu’s unified strength theory, the formula for strength of concrete was determined by fitting the relation between the combined principal stresses and the essential strength, which was verified by experiments carried out using natural marble specimens. Essential strength could promote the accuracy of strength indices, and the formula for strength might replace the existing strength theories for brittle materials. The initial solution of these two classic issues could make a new contribution to Yu’s unified strength theory and its final goal, promoting related research on material strength and leading to a more rational use of material strength in practical engineering.

【 授权许可】

Unknown