Fig. 7

FAA demands as obtained from IDA for different strength ratio of reinforced concrete structures: (a) 5-storey, longitudinal (\(T_1=0.6624\)Â s); (b) 10-storey, longitudinal (\(T_1=1.3652\)Â s); (c) 15-storey, longitudinal (\(T_1=2.0369\)Â s); (d) 5-storey, horizontal (\(T_1=0.6384\)Â s); (e) 10-storey, horizontal (\(T_1=1.3083\),s), and (f) 15-storey, horizontal (\(T_1=1.9343\)Â s).