통계적 분산을 고려한 콘크리트의 역학적 특성

Abstract

Dept. of Urban and Environmental System Engineering, SeoKyeong University, Seoul 136-704, KoreaABSTRACT The randomness in the strength of a RC member is caused mainly by the variability of the mechanical propertiesof concrete and steel, the dimensions of concrete cross sections, and the placement of reinforcing bars and so on . Among thosevariations, the randomness and uncertainty of mechanical properties of concrete, such as compressive strength, tensile strength, andelastic modulus give the most significant influences and show relatively large statistical variations. In Korea, there has been littleeffort for the construction of its own statistical models for mechanical properties of concrete and steel, thus the foreign data havebeen utilized till now. In this paper, variability of compressive strength, tensile strength and elastic modulus of normal-weight struc-tural concrete with various specified design compressive strength levels are examined based on the data obtained from a numberof published and unpublished sources in this country and additional laboratory tests done by the authors. The inherent probabilisticmodels for compressive and tensile strength of normal-weight concrete are proposed as Gaussian distribution. Also, the rela-tionships between compressive and splitting tensile strength and between compressive strength and elastic modulus in current KCICode are verified and new ones are suggested based on local data.Keywords : compressive strength, splitting tensile strength, elastic modulus, statistical variations, probabilistic distribution models