Blast demand estimation of rc-moment-resisting frames using a proposed multi-modal adaptive pushover analysis procedure

The procedure of estimating the RC moment-resisting frames under blast loading using a multi-mode adaptive pushover (MADP) analysis is investigated in the current study. The main advantage of the proposed procedure is the combination of the multi-mode and adaptive pushover analysis approaches, which has not been done in the past for blast loadings. To investigate the efficiency of the proposed approach, several RC moment-resisting frames (RC-MRFs) of the 4-, 8-, and 20- storey are considered in the study. For a better comparison, the conventional modal pushover analysis (MPA), nonlinear response history analysis (NRHA), and the proposed approach are considered in the simulations. To this end, various influential parameters including the lateral force, floor displacement, storey drift, storey drift ratio, etc. are considered. For all models, the first three mode shapes were considered in the analysis procedure, while for the case of 20 storey RC-MRF, the torsional effect is included as well. The results indicated that the proposed MADP procedure has adequate accuracy and efficiency to estimate the blast loading demand on RC-MRFs.