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Comment: It is desirable that specific guidelines be available for determination of principle axis of an unsymmetrical building. But I think there is no rational approach available by which we can find principle direction of complex structures. For a complex three-dimensional structure, direction of an earthquake that produces maximum stresses in a particular member or at specific point is not apparent. For time history it is possible to perform large number of dynamic analyses at various angles of input to check all points for critical earthquake directions. Such an elaborate study could consume lots of time and financial resources.
When in doubt use 100% + 30% rule. Seems to be the upper bound.
Rudra Nevatia
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