SIZE EFFECT OF DOUBLE-K FRACTURE TOUGHNESS OF HIGH STRENGTH CONCRETE
Based on Bazant Scaling Law method, size effect formulas of double-K fracture toughness were derived to study the size effect of the fracture toughness of high strength concrete. In geometric and nongeometric similarity condition,experimental-study on double-K fracture toughness with several groups of high strength concrete was carried out and proved the size effect of the double-K fracture toughness. Research results showed that with size effect law derived in this paper, nominal double-K fracture toughness was quantitatively described and predicted. Double-K fracture toughness measured from small specimens had the following characteristics: 1) the values of double-K fracture toughness increased by specimen heights and approached the plane strain fracture toughness JCIC ;2) As initial crack length to specimen height ratio ao (initial relative crack height) increased, the values increased first and then decreased,and it reached the peak values while ao equaled to 0.4.
high strength concrete double-K fracture toughness size effect initial relative crack height
Peiyan Huang Zhengwei Li Hao Zhou Ruolin Hu
School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510640 China
国际会议
广州
英文
152-157
2010-12-17（万方平台首次上网日期，不代表论文的发表时间）