EFFECT OF GROUND MOTION DIRECTIONALITY ON SEISMIC RESPONSE OF BASE-ISOLATED BUILDINGS CONSIDERING POUNDING TO ADJACENT STRUCTURES

Abstract eng:
Base isolation has proven an effective strategy to minimize structural and nonstructural damage, prevent functionality disruption and protect sensitive equipment in buildings even under strong ground motions. However, structural pounding with the surrounding moat wall and/or adjacent buildings may induce local and even severe damages to baseisolated structures. This study utilizes a computational methodology that enables the investigation of poundings in a three-dimensional (3D) domain, while considering the arbitrary location of contact points and the geometry at the vicinity of impact; it aims to investigate the circumstances under which spatial pounding may occur and quantify their effect on the response of the base-isolated structure. Given that the seismic response of base-isolated structures subjected to strong ground motions depends on the excitation characteristics, namely frequency content and horizontal ground motion directionality, the sensitivity of the calculated nonlinear dynamic response of a 3-story base-isolated building during pounding against other fixed-supported buildings is thoroughly and parametrically examined. Numerous nonlinear time history analyses are performed on the structural model using selected pairs of recorded horizontal ground-motion orthogonal components. Records are rotated to 73 different horizontal angles of incidence with respect to the building’s structural axes in the range of 0 to 360 degrees. The influence of different parameters, such as the type and the location of the adjacent-fixed supported buildings, is also investigated. The significant influences of (a) the excitation angle and (b) the structural configuration arrangement on the overall peak seismic response are highlighted and quantified.

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