| Title |
Prediction of Equivalent Stress Block Parameters for High Strength Concrete |
| Keywords |
high strength concrete;stress distribution;multiple regression analyses;flexural and compressive members;고강도 콘크리트;응력분포;다중회귀분석;휨과 압축부재 |
| Abstract |
Recently, a high strength concrete of more than 40 ㎫ has been increasingly used in practice. However, use of the high strength concrete may influence on design parameters, particularly stress distribution. This is very true since the current everyday practice employs equivalent rectangular stress distribution that is derived from normal strength concrete. Subsequently, the stress distribution seems to be reevaluated and then a new distribution with new parameters needs to be suggested for the high strength concrete. For this purpose, linear and multiple regression analyses have been carried out in term of using experimental data for the high strength concrete of 40 to 80 ㎫ available in literatures. Accordingly, new parameters associated with the stress distribution have been proposed and employed for the design of flexural and compressive members. Comparative design examples indicate that designs with new parameters reduce section dimensions compared to those with the current code parameters for concrete strengths of 40 to 70 ㎫. In particular, for compressive members, design with new parameters exhibit conservative compressive force compared to those with the current code parameters. |