Research On Safety Level Of Crack Control For FRP Strengthened Concrete Members

4th International Conference on Applied Materials and Manufacturing Technology

材料科学;机械制造

Xin, Dai^1 ; Yang, Li^1

School of Civil Engineering and Environment, Hubei University of Technology, Wuhan City

430068, China^1

关键词: Concrete members;    Crack control;    Crack width;    Flexural cracks;    Load combination;    Safety level;    Structure design;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/423/1/012005/pdf
DOI  :  10.1088/1757-899X/423/1/012005

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

According to the crack-width formula in FRP strengthened concrete structure design codes, the relationship between flexural crack-width formula's calculation guarantee rate and load combination was studied. A new concept named as "equivalent guarantee rate" was created to evaluate the safety level of flexural crack-width calculation under frequent combination and quasi-permanent combination. With this new concept the safety level of flexural crack-width formula in GB 50608-2010 were evaluated. In the end two revised suggestion about present flexural crack-width formula in GB 50608-2010 were presented: the flexural crack-width formula's calculation guarantee rate should be lowered from 95% to 85% under characteristic combination, correspondingly the value of characteristic coefficient in flexural crack-width formula should be lowered from 2.1 to 1.8; Alternatively, the flexural crack-width should be calculated under frequent combination in place of characteristic combination.