Study On Deflections And Cracks Of Steel Reinforced Concrete Flexural Members

Calculation methods of deflections and cracks of steel reinforced concrete flexural members were discussed in this paper Formulas for deflections and crack widths considering bond-slip between steel and concrete were proposed. The main contents are as follows:Deflections The deflections of SRC flexural members can be divided into two parts: (1) Deflections calculated using stiffness of members, considering adequate bond strength between steel and concrete and without slip; (2) Additional deflections of SRC flexural members under different loading cases caused by the effect of relative slip. Total deflections were formed by the above two kinds of deflections.Crack widths Crack widths referred to the widths at location of resultant of longitudinal tension steelbars. Same as deflections, crack widths of SRC flexural members also were divided into two parts. First were crack widths ignoring the bond-slip between steel and concrete; second were additional crack widths considering additional strain of longitudinal tension steelbars caused by the relative slip. Total crack widths were formed by the above two kinds of crack widths.Span-depth ratio Span-depth ratio was selected by calculation methods of deflections. Based on the above methods, deflections of many different SRC flexural members were calculated, and the corresponding span-depth ratio were determined Main factors affecting span-depth ratio and the relationship between factors and span-depth ratio were interpreted At last, the range of the maximum span-depth ratio, which the deflections calculated by it meetthe code, was given.