JPKIC RC structures as an example 结构设计原理 jhepniheipledstucturedesgn Assume steel and concrete as elastic material Plane section assumption that deformation keep a section The tensile strength of concrete may be neglected ● Strains of steel and concrete at contact are equal &=8 E bx h A b Schematic of allowable stress method of RC elementc  RC structures as an example ⚫ Assume steel and concrete as elastic material ⚫ Plane section assumption that deformation keep a section ⚫ The tensile strength of concrete may be neglected ⚫ Strains of steel and concrete at contact are equal b x h s  s As    c c bx  2 As Schematic of allowable stress method of RC element s ci  = 