the investigation of safe residual drift of symmetric rc corewall structures against immediate aftershocks

Strong ground motions may induce permanent or residual displacements to structures, and are probable to be followed by several less violent aftershocks within minutes to days after the mainshock leaving no time for repair or retrofit, hence the casualties tend to increase.previous research has suggested the residual drift limits with regards not only to structural performance as in seaoc-2000 (vision, 1995) proposing performance level based on residual drift values, but also to building functionality (i.e. in one study it was found that the residents of buildings with residual inclination of greater than 0.008 rad experience headaches and dizziness (mccormick et al., 2008) and in another research it was shown that doorway system malfunction occurs inbuildings with residual displacement of greater than 0.00 5 rad (jbdpa, 2001).