12-27-2011, 03:22 PM
An alternative procedure for seismic analysis & design of tall buildings located in the LA region
Author: LATBSDC | Size: 1.2 MB | Format: PDF | Publisher: LATBSDC | Year: 2008 | pages: 32
Code provisions are intended to provide a minimum level of safety for engineered buildings. The code prescriptive provisions are intended to provide safe design criteria for all types of buildings, ranging from small one and two story dwellings to the tallest structures. As a result of this broad intended applicability, the provisions contain many requirements that are not specifically applicable to tall buildings and which may result in designs that are less than optimal, both from a cost and safety perspective. Advances in performance based design methodologies and maturity of capacity design principles now permit a more direct, nonprescriptive, and rational approach to analysis and design of tall buildings. This document relies on these advances to provide a rational approach to seismic design of reliable and effective tall building structures. This Document addresses only non-prescriptive seismic design of tall buildings.
This document is not intended to cover essential facilities.
This provisions of this document are justified based on Section 104.11 of 2006 edition of International Building Code (2006 IBC) and Section 108.7 of 2007 California Building Code. These code provisions permit application of alternative lateral-force procedures using rational analysis based on well-established but complex principles of mechanics in lieu of prescriptive code provisions. All codes have traditionally permitted the use of alternative analysis and design methods which can be justified based on well-established principles of mechanics and/or supported by convincing laboratory test results. For example, Section 12.6 of ASCE 7-05 which is adopted by reference in 2007 CBC states:
"The structural analysis required by Chapter 12 shall consist of one of the types permitted in Table 12.6.1, based on the structure's seismic design category, structural system, dynamic properties, and regularity, or with the approval of the authority having jurisdiction, an alternative generally accepted procedure is permitted to be used. ..."
Code:
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