Ghazizadeh, SA; Grant, D; Rossetto, T; (2013) Orientation dependence of ground motion and structural response of reinforced concrete space frames. Presented at: Vienna Congress on Recent Advances in Earthquake Engineering and Structural Dynamics 2013 (VEESD 2013), Vienna, Austria.

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Abstract

Horizontal seismic demand is represented in seismic design codes by a single elastic response spectrum. Using a single spectrum conceals the difference between ground motions that are highly polarised and those for which the demand does not depend significantly on the orientation. In this study, two suites of ground motion were developed using the program RspMatchBi, with each suite characterised by different orientation dependence and seismic demand. Reinforced concrete space frames with various arrangements in plan were modelled in OpenSees. Non-linear time history analysis was carried out with the suites of records applied to the models at 9 degree increments, through 360 degrees of non-redundant orientations. An iteration process was implemented to determine the scaling factor for each ground motion at which storey drift exceeded a design level of 2.5% in 50% of applied orientations. Various performance criteria were also taken into account to investigate the changes in orientation dependence of seismic structural response. Results suggest that azimuthdependent structures are more vulnerable to orientation-dependent seismic demand, and that the investigation of directionality for seismic design needs further consideration in terms of performance criteria and structural periods at each principle axis.

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