A Study of a Load Combination Method Considering the Correlation among Dynamic Loads : 2nd Report, Load Combination for the Seismic Response Analysis of a Liquid Storage Tank : Part 2

概要

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This report presents a load combination methodology for dynamic response analysis problems, based on a stochastic approach which has been practically introduced in the field of random vibration theory. The methodology proposed in this report has the advantageous point that the appropriate correlation effect among combined load compoents is take into consideration and is evaluated in terms of the dynamic correlation factor p. The specific combination problem discussed here is the calculation of the maximum base shear coefficient of a large-scale cylindrical liquid storage tank which can be simulated by a simplified lumped mass model, whereby the sloshing effect of the liquid is neglected. It is concluded that the equations of combination constructed here are applicable for the case where the fundamental natural frequency of input acceleration such as seismic ground excitation; while an equation proposed in a previous report is effective for other cases. The accuracy of this method is statistically examined by use of the random vibration technique; and its advantage over SRSS (square root of sum of squares) law and ABS (absolute value summation) law is examined with the aid of the numerical computation of practical examples.
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