Appendix H To Chapter 6 HAZUS AEBM Regulations
The Probability of Collapse, P[COL], is calculated by Equation (A6-1):
P[COL|STR5] = collapse factor of the HAZUS AEBM, as modified herein, and
P[STR5] = probability of Complete Structural Damage, based on HAZUS AEBM methods and parameters, as modified herein.
Building-specific properties are based on the building type (structural system), or Model Building Type (MBT), building height (number of stories above seismic base), building age (pre-1933, 1933 — 1961 or post-1961 design vintage), availability of materials testing data, and Significant Structural Deficiencies.
Table A6-1 lists Significant Structural Deficiencies. Table A6-1 includes older buildings (pre-1933 buildings) and buildings that do not have available materials test data, and treats these conditions as Significant Structural Deficiencies.
SPC-1 buildings with no Significant Structural Deficiencies are evaluated using "Baseline" values of building-specific properties. SPC-1 buildings with one or more Significant Structural Deficiencies are evaluated using SubBaseline (SubBase), or Ultra-Sub-Baseline (USB) buildingspecific properties, as specified in Table A6-1.
Building-specific properties include parameters related to (1) building capacity, (2) building response, (3) Complete Structural Damage, and (4) building collapse. Appendix H Sections 6-A4 through 6-A7, define the parameters of interest related to building capacity, building response, Complete Structural Damage and building collapse, respectively, and specify appropriate values of these parameters.
Building-specific capacity properties of interest include the yield capacity control point (Dy, Ay) and the ultimate capacity control point (Du, Au), as calculated by Equations (A6-2 through A6-5, respectively):
Cs = seismic design coefficient — values of Cs are given in Tables A6-2a and A6-2b, respectively,
α1 = modal weight factor, Alpha 1 — values of α1 are given in Table A6-4,
Te = elastic period, in seconds — values of Te are given in Table A6-3,
γ = yield strength factor, Gamma — values of γ are given in Table A6-5,
λ = "overstrength" factor, Lambda — values of λ are given in Table A6-5, and
μ = "ductility" factor, Mu — values of μ are given in Table A6-6.
Building-specific damage parameters of interest include the median spectral displacement of the Complete Structural Damage state, SdC, and the associated lognormal standard deviation (Beta) factor, βC. Values of βC are given in Table A6-11. Median spectral displacement at the Complete Structural Damage state, SdC, is calculated using Equation (A6-6):
ΔC = interstory drift ratio (of the story with maximum drift) at the threshold of Complete Structural Damage — values of ΔC are given in Table A6-9,
HR = height of building at the roof level, in inches — default values of HR are given in Table A6-3 as a function of the number of stories above grade,
α2 = modal height factor, Alpha 2 — values of α2 are given in Table A6-4, and
α3 = modal shape factor, Alpha 3, relating maximum-story drift and roof drift, values of α3 are given in Table A6-10.