Seismic Capacity Comparisons of Reinforced Concrete Buildings with Various Ductility by Incremental Dynamic Analysis.

Generally three types of moment resisting frames are designed namely, special ductile frames (SDF), intermediate ductile frames (IDF) and gravity load designed (GLD) frames, each of which has a certain level of ductility. omparative studies on the seismic performance of three different ductility of 5-storey dormitory building are performed under 20 simulated earthquakes in this study. The analytical models are considered for all types of failure modes of buildings, i.e. for beam and column: shear failure, flexural to shear failure, and flexural failure, beam-column joint connection, infill wall, and foundation.

This study applied the concept of equivalent single degree of freedom (ESDOF) for evaluating the seismic performance of the studied building by the mean of incremental dynamic analysis (IDA). The results found that this method can reduce the computational time from 90 minutes per load case for multi degree of freedom (MDOF) to 6 minutes per load case for ESDOF. It reduced about 93% of computational time. This study also found that the lateral load capacity of GLD, IDF, and SDF building was 16.64, 23.63, and 23.56%W, respectively. The average response spectrum at the collapse state for GLD, IDF, and SDF are 0.53 g, 0.77 g, and 0.80 g, respectively. The results also show that SDF is more ductile than IDF, and the initial strength of SDF is close to IDF. The results indicate that all of frames are able to resistant a design earthquake.