ABSTRACT
Abstract A non-linear analysis has been used to remove some of the conservatisms associated with assessing a safety-critical reinforced concrete structure under seismic loading. The structure consists of multiple concrete columns and beams supporting a heavy item of plant, which runs on rails supported by the beams. The explicit finite element code LS-DYNA has been used. The parameters of a concrete material model have been developed, by comparing several modes of structural failure with published experimental results. The ability of the concrete material model to cope with cyclic loading has been demonstrated. The reinforced concrete structure has been modelled using a simple mesh but with explicit representation of the reinforcement bars. Seismic loading has been applied to the model and the response of the structure and plant has been calculated. The integrity of the structure has been demonstrated, whereas previous design code based linear elastic assessments had indicated significant overstress. A safety case has been made which has removed the need for difficult and expensive modifications. Keywords: Assessment, LS-DYNA, non-linear, reinforced concrete, safety case, seismic analysis.
