Effects of seismic incident angle on response of structures under bi-directional recorded and artificial ground motion

Abstract eng:
The objective of the present paper is to investigate: (a) the influence of the orientation of ground motion horizontal components on structural response within the context of Linear Response History Analysis and (b) to find out the differences (if any) between the effects produced by recorded and artificial ground motions. For this purpose two single storey and two five storey buildings are analyzed for several bi-directional ground motions. The ground motions are represented by both recorded and artificial accelerograms which match the code’s design spectrum. The maximum response of each building is computed for the following cases: (a) the accelerograms are applied along the structural axes; (b) the accelerograms are rotated around a vertical axis so as to form an angle θ=10o, 20o,…,180o with regard to structural x-axis; and (c) the accelerograms are transformed in order to become uncorrelated to each other and are then applied along the structural axes. Furthermore, the maximum structural response for all possible directions of seismic incident angle is computed by using well known analytical formulae. The evaluation of the results shows that: (a) the response is significantly affected (up to 300%) by the orientation of ground motion components; (b) the uncorrelated accelerograms applied along the structural axes do not produce the maximum response. P

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