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Posted: Wed Sep 22, 2004 4:44 am Post subject: Principal direction of an earthquake
I have my comments on point 2 raised by Mr.. Ingle.
Written by Mr..Ingle: CL 4.17 Principal axes can the code through some light in obtaining the principal axes of an unsymmetrical building. It may be obtained as axes defining maximum and minimum moment of inertia. I.e. for L shape building, it may be u-u and v-v axes. I think it may be proper to study the direction of the fundamental mode shapes (each in principal direction) of the building. This information can be used in defining the principal axes of the building for further calculations.
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.
Please let us have your views on this.
Paresh Patel Jacobs Babtie India Ahmedabad
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