{"title":"An Investigation on the Accuracy of Nonlinear Static Procedures for Seismic Evaluation of Buckling-restrained Braced Frames","authors":"An Hong Nguyen, Chatpan Chintanapakdee, Toshiro Hayashikawa","volume":39,"journal":"International Journal of Civil and Environmental Engineering","pagesStart":92,"pagesEnd":99,"ISSN":"1307-6892","URL":"https:\/\/publications.waset.org\/pdf\/10450","abstract":"Presented herein is an assessment of current nonlinear\r\nstatic procedures (NSPs) for seismic evaluation of bucklingrestrained\r\nbraced frames (BRBFs) which have become a favorable\r\nlateral-force resisting system for earthquake resistant buildings. The\r\nbias and accuracy of modal, improved modal pushover analysis\r\n(MPA, IMPA) and mass proportional pushover (MPP) procedures\r\nare comparatively investigated when they are applied to BRBF\r\nbuildings subjected to two sets of strong ground motions. The\r\nassessment is based on a comparison of seismic displacement\r\ndemands such as target roof displacements, peak floor\/roof\r\ndisplacements and inter-story drifts. The NSP estimates are compared\r\nto 'exact' results from nonlinear response history analysis (NLRHA).\r\nThe response statistics presented show that the MPP\r\nprocedure tends to significantly overestimate seismic demands of\r\nlower stories of tall buildings considered in this study while MPA\r\nand IMPA procedures provide reasonably accurate results in\r\nestimating maximum inter-story drift over all stories of studied BRBF\r\nsystems.","references":"[1] ATC Seismic evaluation and retrofit of concrete buildings: Volumes 1\r\nand 2, ATC-40, Applied Technology Council, Redwood City,\r\nCalifornia, 1996.\r\n[2] ASCE Prestandard and commentary for the seismic rehabilitation of\r\nbuilding, FEMA-356, American Society of Civil Engineers (ASCE),\r\nFederal Emergency Management Agency, Washington, DC, 2000.\r\n[3] C. 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