UNINTENDED CONSEQUENCES OF CODE MODIFICATION

摘要

The code provisions for earthquake resistant design have been substantially revised in the conversion of the 1994 Uniform Building Code (UBC) through the 1997 UBC to the 2000 International Building Code (IBC). This paper examines five of the most recent changes to the code: the vertical earthquake component; the seismic design of nonstructural components and equipment; the maximum inelastic response displacement; the use of 2/3 of the maximum considered earthquake; and the reliability/redundancy factor. The apparent reasoning behind these five changes and some of the unintended consequences are discussed.