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PREFACE:

The intent of the document is to provide an alternate, performance-based approach for seismic design and analysis of tall buildings with predictable and safe performance when subjected to earthquake ground motions. 

These provisions result in more accurate identification of relevant demands on tall buildings. As such, the application of the procedure contained in this document is expected to result in buildings which effectively and reliably resist earthquake forces.The current edition of this document (2008 LATBSDC) contains significant and numerous changes fromthe previous edition (2005 LATBSDC). 

The publication of the 2005 Edition of this document initiated a flurry of activities in development of guidelines and methodologies with the aimof improving the analysis, design, and construction of tall buildings in seismic regions. 

The San Francisco Department ofBuilding Inspection (SFDBI) was the first entity that followed suit and their first drafts of the document which eventually became AB-083 and was published by the Structural Engineers Association of Northern California (SEAONC) and adopted by SFDBI closely resembled the 2005 LATBSDC document.

 During its development, however, AB-083 took its own formand became a very different document from2005 LATBSDC by the time it was published (SEAONC 2007). The authors of AB-083 graciously encouraged LATBSDC to adopt as much of the language of AB-083 as deemed necessary in development of 2008 LATBSDC (Maffei 2007).

While AB-083 and 2008 LATBSDC share the sameroots and much of the samelanguage, their approaches to seismic design of tall buildings are markedly different. Both 2005 LATBSDC and AB-083 embody prescriptive code approaches where a few carefully enumerated exceptions are permitted.

 2008 LATBSDC, in contrast, completely disengages from prescriptive requirements and bases all of its provisions on Capacity Design and Performance Based Design methodologies.