INTER-STORY POUNDING AND TORSIONAL EFFECT DUE TO INTERACTION BETWEEN ADJACENT MULTISTORY RC BUILDINGS

Abstract eng:
The influence of the structural pounding on the seismic behaviour of reinforced concrete structures designed to EC2 and EC8 with non-equal story heights is investigated. In these cases the slabs of the diaphragms of the short stiffer structure hit the columns of the other adjacent structure at points within their deformable heights. Further it is quite usual seismically induced oscillations of a structure in a block of buildings in city center to be partly restrained in lateral displacements and therefore torsional behaviour to be introduced during an earthquake excitation. In this work the case of an 8-story reinforced concrete building that suffers inter-story pounding in a non-symmetric way is studied. Pounding occurs only in one (case 1) or in two (case 2) columns of the structure whereas the other columns are free to move without restrictions and therefore a torsional behavior is produced. The slabs of the short stiff structure hit the columns of an 8-story frame structure at a height equal to 2/3 of their deformable length. Nonlinear dynamic step-by-step analysis and special purpose elements are employed for the needs of this study. Pounding cases with torsional effect between structures with non-equal story levels and different total heights for three excitations are studied and results in terms of displacements, torsional rotations, shear forces, ductility requirements are presented and commented. The results clearly show that high capacity requirements in terms of torsional moments and column shear strength are developed due to the asymmetric inter-story pounding. Furthermore from the results it can also be deduced that the columns that suffer the hit develop high shear requirements that exceed the available capacity during the step-by-step seismic response of the structures.

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