Report - PEER - University of California, Berkeley

A subcommittee on performance evaluation and limit states in the reinforcedconcrete steering committee of the Architectural Institute of Japan (AIJ) published anew guidelines as a draft[3] in January 2004, which proposed new concepts onseismic performance evaluation of reinforced concrete buildings as well as detailedevaluation methods on member performances, especially, on the limit statedeformations, based on recent research backgrounds. This paper outlines the new AIJGuidelines 2004.2. REVIEW OF AIJ GUIDELINES FOR SEISMIC DESIGN OFREINFORCED CONCRETE BUILDINGSThe Architectural Institute of Japan has published a series of design guidelines onstructural design or earthquake resistant design of reinforced concrete buildings. Thedesign guidelines based on ultimate strength concept[1] was first published in 1988 asa draft, the first edition in 1990, and English version in 1994. The guidelines specifieda method of ensuring the overall beam-yielding collapse mechanism based on socalled“capacity design philosophy.” The hinge regions and the non-hinge regions areclearly selected and the design actions for non-hinge regions are factored consideringpossible variations. Also the guidelines presents new design methods such as for (1)shear to ensure target ductility, (2) bond, (3) beam-column joints, (4) detailing againsthigh axial load, (5) non-structural components.AIJ published the second design guidelines based on inelastic displacementconcept[2], in 1997 as a draft, and the first edition in 1999. The guidelines wasoriginally planned as a revised version of above first guidelines, although it waspublished in a new style of performance-based verification, including inelastic limitdeformation demands and new methods of calculating deformation capacity ofreinforced concrete members. The guidelines has introduced or presented (1) criteriaor limit states clearly defined using inelastic deformations, (2) performanceverification format, (3) various analytical tools, (4) design against bi-directionalmotions, (5) potential hinge regions, (6) new design equation for shear and bond, (7)design formula for deformability, (8) quantitative design for confinement, and (9)design example. These two guidelines gave a method of evaluating structural andmember capacities in practice, although they basically followed the structural demandlevels for the ultimate lateral load carrying capacity prescribed in the former BuildingStandard Law(BSL) of Japan until 2001.The new AIJ guidelines 2004[3] for seismic performance evaluation introducedthe following basic concepts or new methods in practice:(1) definition of seismic performance, both in deterministic and probabilistic ways,(2) specification of earthquakes for performance evaluation,(3) simple and practical formula for estimating soil amplification,(4) analytical methods for estimating inelastic response of the building,(5) limit states defined with deformation based on member damage levels,(6) reparable limit states derived from post-earthquake residual damage, and28