The shake table testing of a 7-story residential building slice at the University of California, San Diego in 2006 endorsed a number of displacement-based design approaches. The building was designed for specific strain limits. The design resulted in lateral forces that were significantly lower than those prescribed by current design code. The building's seismic performance was not only very satisfactory but rather predictable. This landmark test taught a number of lessons, some of which had been pointed out by past researchers but have not found their way into design codes and practice. This paper is formulated in two parts. Part I discusses five important lessons. Part II presents a design approach that builds on the equivalent static lateral force design method and incorporates the lessons learnt. The approach incorporates explicitly the effect of higher modes and system overstrength to evaluate system shear force and bending moment design envelopes.
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