![]() Bresler indicates that it is reasonably accurate to assume that α = β therefore, the previous equation becomes (shown graphically in "Figure 11 - Interaction Curves for Bresler Load Contour Method" ):įigure 11 - Interaction Curves for Bresler Load Contour Method The values of the exponents α and β are a function of the amount, distribution and location of reinforcement, the dimensions of the column, and the strength and elastic properties of the steel and concrete. Note that (M nx and M ny ) are the vectorial equivalent of the nominal uniaxial moment M n. M noy = The nominal uniaxial moment strength about the y-axis M nox = The nominal uniaxial moment strength about the x-axis ![]() M ny = The nominal biaxial moment strength in the direction of y axis M nx = The nominal biaxial moment strength in the direction of x axis The general expression for these curves can be approximated by a nondimensional interaction equation of the form: These curves, as illustrated in "Figure 10 - Bresler Load Contours for Constant Pn on Failure Surface S3", may be regarded as “load contours”.įigure 10 - Bresler Load Contours for Constant P n on Failure Surface S 3 ![]() In this method, the surface S 3 (P n, M nx, M ny ) is approximated by a family of curves corresponding to constant values of P n. ![]()
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