The inter-story pounding effect on the seismic behavior of infilled and pilotis RC structures (original) (raw)

2013

Abstract

ABSTRACT The influence of the inter-story structural pounding on the seismic behavior of adjacent multistory reinforced concrete structures with unequal story heights is studied taking into account the local response of the infill panels. Results of more than one hundred dynamic analyses indicate that, the most important issue in the interaction between structures is the local response of the column of the tall structure that suffers the hit of the upper floor slab of the adjacent shorter and stiffer structure. This column appears to be in most of the times in a critical condition due to shear action. In this paper the influence of the infill panels on the pounding problem of adjacent structures is studied. Two types of masonry infilled structures are considered: (a) infilled frame and (b) infilled frame without infills at the base story (pilotis frame). Results in terms of interstorey drifts, shear requirements, ductility requirements and infill local seismic response are presented. The influence of the infill panels on the seismic performance of the critical column that suffers the hit led in all examined cases to an increase of the demands for shear and ductility, when compared to the corresponding values that are developed in the cases that the RC structure is studied without considering the infills. Thus, it can be demonstrated that in all examined inter-story pounding cases the presence of the infills was not enough for the amelioration of the excessive demands for shear and ductility of the column that suffers the impact. Nevertheless, the presence of the masonry infill panels has been proved as an important parameter for the safety of the building. Non-linear dynamic step-by-step analyses and special purpose elements are employed for the needs of this study.

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