The maximum drift ratio was measured when the strength reduced to 80% of the maximum load.
The maximum drift ratio of all the eleven earthquakes is given in Fig. 8.
For brevity, the IDA results are presented only in terms of maximum drift ratio as the demand parameter.
Table 6 summarizes the yield load (V y ), yield drift ratio (θ y ), maximum load (V u ), maximum drift ratio (θ u ), and ductility ratio of each specimen.
HPFRCC specimens HC-2.0 and HC-3.5 having bundled diagonal reinforcement and half the transverse reinforcement required in ACI 318-14 produced the maximum drift ratio of about 5.98 and 10.79, respectively.
Concrete coupling beam specimens RC-2.0 (l n /h = 2.0) and RC-3.5 (l n /h = 3.5), which had bundled diagonal reinforcement, achieved the maximum drift ratio of about 5.37 and 10.04, respectively.
For structures with a moderate period of vibration with maximum drift ratio as the damage measure (DM) and the 5 % damped first mode spectral acceleration (Sa (T1,5 %)) as the IM subjected to a bin of relatively moderate to large magnitudes, M, results obtained from scaled and un-scaled records are similar.
It is observed that the main structure remained resilient after the nine tests with the maximum drift ratio of about 2.98%, though cracking in concrete cover at the eastern connectors was found after a number of reversal loading, which calls for improved structural details.
The investigation focuses on the examination of the maximum displacements, maximum residual displacements, maximum interstorey drift ratio, maximum residual interstorey drift ratio, damage indices and ductility demands.
The present paper investigates the effectiveness of ten structure-specific IMs in reducing scatter in the estimated maximum interstory drift ratios of 3D R/C buildings.
