8[6]Hibbitt,Karlson,Sorenson.ABAQUS Version 6.4:Theory manual,users manual,verification manual and example problems manual[M].Hibbitt,Karlson and Sorenson Inc,2003.
9[7]Hillerborg A,Modeer M,Petersson P E.Analysis of crack formation and crack growth in concrete by means of fracture mechanics and finite elements[J],Cement and Concrete Research,1976,6(6):773-782.
10[9]Hognestad E,Hanson N W,McHenry D.Concrete stress distribution in ultimate strength design[J],ACI Journal,Proceeding,1955,52(4):455-479.