Seismic performance assessment of low-rise reinforced concrete moment frames with different slab types using nonlinear time history analysis (performance of LR RC frames with different slabs by NLTHA)

Abstract

This study explores the global influence of different slab types on the seismic behaviour of reinforced concrete (RC) frames, focusing on an innovative RC frame supporting a composite slab of galvanised steel deck and concrete. The aim is to provide key insights for improved seismic analysis and design in structural engineering. A rigorous nonlinear time history analysis was employed, considering bar slip, shear, and flexural deformation. These were modelled using a distributed plasticity framework with fibre-section techniques in OpenSees, using 51 ground motion records. Base shear from 2D frames with composite slabs was 30% less than other cases. Per Hazus-MH MR5, composite and solid one-way slab frames showed up to 27% lower inter-story drift, performing best among all cases. Achieving a 40% reduction in building weight, material use, and improved seismic performance under NTHA makes the composite slab a strong competitor to conventional slabs in RC construction.