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alteration of aload-bearing member that is an essential part of the structural frame, or because other existing physical or site constraints prohibit modification or addition of elements, spaces or features which are in full and strict compliance with the minimum requirements for new construction and which are necessary to provide accessibility. 20.08.088 Section 3402.1 added -Definitions. Sections 3402.1 Definitions of the California Building Standards Code 2007 Edition, (24 C.C.R.), and including by reference the International Building Code, 2006 Edition, Volumes 1 and 2 is added to read as follows: Substantial Structural Damage. A condition where: 1. In any story, the vertical elements of the lateral-force-resisting system, have suffered damage such that the lateral load-carrying capacity of the structure in any direction has been reduced by more than 20 percent from its pre-damaged condition, or 2. The capacity of any vertical gravity load-carrying component, or any group of such components, that supports more than 30 percent of the total area of the structure's floor(s) and roof(s) has been reduced more than 20 percent from its pre-damaged condition, and the remaining capacity of such affected elements with respect to all dead and live loads is less than 75 percent of that required by the building code for new buildings of similar structure, purpose, and location. 20.08.090 Section 3403.5 added -Repairs. Sections 3403.5 Repairs of the California Building Standards Code 2007 Edition, (24 C.C.R.), and including by reference the International Building Code, 2006 Edition, Volumes 1 and 2 is added to read as follows: 3403.5 Repairs. Repair requirements for Additions, Alterations or Repairs. 3403.5.1 Scope. Repairs of structural elements shall comply with this section. 3403.5.1.1.1 Evaluation and design procedures. The seismic evaluation and design shall be based on the following procedures: a) As specified in the building code (Chapter 16) b) ASCE 31 Seismic Evaluation of Existing Buildings (for evaluation only) c) ASCE 41 Seismic Rehabilitation of Existing Buildings. 3403.5.1.1.2 CBC level seismic forces. When seismic forces are required to meet the building code level, they shall be one of the following: 1. 100 percent of the values in the building code. The R factor used for analysis in accordance with Chapter 16 of the building code shall be the R factor specified for structural systems classified as "Ordinary" unless it can be demonstrated that the ~t