SHEAR MODELS OF RC-ENCASED STEEL JOIST BEAMS IN MRFs

This  study  presents the  application of  different analytical and finite  element (FE)  models  aimed at  predicting  the  shear  resistance of reinforced concrete (RC) and reinforced concrete-encased steel joist (HRCESJ) beams with inclined transversal reinforcement in moment resisting frames (MRFs). In particular,  four  analytical  models  are  taken into account, two of  them  specifically  conceived  for  HRCESJ beams in seismic area. The analytical models considered are Eurocode-2 model for the shear strength of RC beams; a variable-inclination stress-field approach; a strut-and-tie additive model and, finally,  an  analytical  formulation  in  which  the  shear capacity depends on the number of pairs of inclined stirrups able to yield before concrete crushing. The models are validated against a large  experimental  and FE dataset covering a wide range of characteristic parameters of the beam typology. The results obtained are discussed  in  order  to stress the influence of different key assumptions adopted in both FE and analytical approaches.

$2.00Add to Cart

Piero Colajanni, Lidia La Mendola, Alessia Monaco