SIMULATION OF CORRELATED MODULUS OF ELASTICITY AND COMPRESSIVE STRENGTH OF LUMBER WITH GAIN FACTOR

This paper discusses a gain factor model for the simulation of correla ted stationary material properties of lumber (modulus of elasticity an d compressive strength) in standard normalized space. Coupled with tre nd and multivariate standard normal simulation models, the gain factor model has been used for simulation of nonstationary properties of lum ber. The mathematical formulae of ensemble autocorrelation functions a nd power spectra have been obtained with test data based on nonlinear least square regression with constraints minimization. The method can estimate the spectrum of data profiles with few points which can be us ed to simulate the strength of lumber by the spectral representation m ethod.