Building retrofit with reduced web (RWS) and beam (RBS) section limited-ductility connections

Softening of beams near the moment connection can be regarded as one most convenient methods for retrofitting non-seismically designed buildings. This done by drilling beam web (aka RWS–Reduced Web Section) or cutting flanges RBS–Reduced Beam Section). Thus, becoming a cost-effective option and erection new buildings, while optimising use steel; making this high environmental impactful material. study presents comprehensive investigation effects using extended end-plate bolted RWS RBS connections in building behaviour when subjected to strong ground motion. For that purpose, incremental dynamic analyses (IDA) were performed low height fitted with capable limited ductility. was aim characterising seismic buildings deficient earthquake design after being upgrade. It is observed empirical fragility curves show probabilities exceeding 1%, 2% 4% inter-story drifts are significantly lower (more than 25%) instead connections; probability collapse reduced at least third. indicates deployment reduce risk both; severe structural damage and, large economical loss due non-structural elements demands moderate.