HOW HAVE CHANGES IN BUILDING CODE PROVISIONS FOR REINFORCED CONCRETE FRAME STRUCTURES

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HOW HAVE CHANGES IN BUILDING CODE PROVISIONS FOR REINFORCED CONCRETE FRAME STRUCTURES IMPROVED SEISMIC SAFETY?

Author: . B. Liel , C. B. Haselton , and G. G. Deierlein | Size: 0.3 MB | Format: PDF | Quality: Unspecified | Publisher: Dept. of Civil Engineering, Stanford University, Stanford | pages: 10

This study provides an analytical comparison of seismic performance of a typical California office building designed according to the 1967 Uniform Building Code and the 2003 International Building Code. The seismic performance predictions are based on a performance assessment method developed by the Pacific Earthquake Engineering Research (PEER) Center, which employs incremental nonlinear dynamic time-history analyses. Comparisons are made for a four-story reinforced concrete (RC) moment frame building designed to be representative of a) pre-1970 non-ductile reinforced concrete construction and b) modern (2003) ductile reinforced concrete construction. The plan and elevation of the building are identical for both structures; differences are evident in the magnitude of design loading, the relative strength of structural elements, and detailing of beams, columns, and beam column joints. For each building, a nonlinear dynamic analysis model captures the behavior of the important failure modes up to the onset of collapse, accounting for uncertainties in structural behavior, modeling, and ground motions. The performance quantity of interest in this study is the collapse risk, particularly mean annual frequency of collapse. By comparing the computed
collapse risk for the two structures, performance improvements in RC frame buildings over the three decades since the San Fernando earthquake can be
quantified.

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