Report - PEER - University of California, Berkeley

AN OUTLINE OF AIJ GUIDELINES FOR PERFORMANCE EVALUATIONOF EARTHQUAKE RESISTANT REINFORCED CONCRETE BUILDINGSToshimi KABEYASAWA*ABSTRACTThis paper outlines AIJ guidelines for seismic performance evaluation published in January2004 as a draft. The guidelines provides deterministic and probabilistic methods of evaluatingseismic performance level of a reinforced concrete building which has been designed in detailbased on an appropriate design guidelines. The limit states of the structures are selected on theinelastic load-deformation curve by estimating the post-earthquake damage levels of memberscorresponding to the performance objectives as: (1) serviceability, (2) minor repair, (3) majorrepair, and (4) safety. The deterministic procedure evaluates the basic seismic capacity indexfor each limit state, which is defined as the amplitude ratio of the capacity earthquake to thestandard earthquake, where the capacity earthquake is to induce the response equal to the limitstate. The probabilistic evaluation method is provided as an additional procedure, where theperformance level is expressed using the probability of exceeding the limit state by site-specificearthquakes during design service life.Keywords: Limit states; Seismic performance evaluation; Serviceability; Reparability;Safety.1. INTRODUCTIONThe Architectural Institute of Japan has proposed a series of seismic design guidelinesfor reinforced concrete buildings[1][2], where calculation methods and detailing ofreinforced concrete members are presented to assure ductile overall mechanism. Theevaluation methods, especially for ultimate strength and deformability of members,proposed in these guidelines, have not only promoted research as a model code butalso have been used in advanced practical design.On the other hand, the Building Standard Law of Japan was revised in 2001,where design earthquake response spectrum was explicitly specified at the bedrockand the design method of comparing the inelastic response with the limit states wasintroduced as the design criteria, called as “limit strength design method.” Although,the basic concepts for defining the limit states were specified, the detailed and generalcalculation methods were not specified._____________Earthquake Research Institute, University of TokyoAddress: 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-0032, Japan, E-mail: kabe@eri.u-tokyo.ac.jp27