4.1.8.9.(1)ATTRIBUTION:
Functional Statement:
F20
To support and withstand expected loads and forces.
Objective:
OS2.1
APPLICATION:
Ductility-related, Rd, and overstrength-related,
Ro, force modification factors applicable to the building structure to be used in calculating the base lateral earthquake force, V, in Sentence
4.1.8.11.(2), and the base lateral earthquake force (dynamic analysis),
Vd, in Sentence
4.1.8.12.(5).
Building height restrictions based on the Seismic Force Resisting System and the modified short and long
period spectral design accelerations.
This applies to buildings described in Sentence
1.3.3.2.(1) of Division A and to buildings to which Part 9 applies [see Sentence
1.3.3.3.(1) of Division A for application
of Part 9] that are required to be designed in accordance with the requirements
of Part 4.
INTENT:
To limit the probability that the calculation of loads due
to earthquake will not take into account the properties of the structural
system [i.e. lack of ductility, energy absorption and overstrength], which
could lead to structural failure, which could lead to harm to persons.
To limit the probability that the lateral-force-resisting
system chosen for the design will not have a minimum ductility, integrity,
and overstrength to absorb local failure due to maximum expected seismic ground
motions, which could lead to structural failure, which could lead to harm
to persons.
ATTRIBUTION:
Functional Statement:
F20
To support and withstand expected loads and forces.
F22
To limit movement under expected loads and forces.
Objective:
OP2.1, OP2.4
APPLICATION:
Ductility-related, Rd, and overstrength-related,
Ro, force modification factors applicable to the building structure to be used in calculating the base lateral earthquake force, V, in Sentence
4.1.8.11.(2), and the base lateral earthquake force (dynamic analysis),
Vd, in Sentence
4.1.8.12.(5).
Building height restrictions based on the Seismic Force Resisting System and the modified short and long
period spectral design accelerations.
This applies to buildings described in Sentence
1.3.3.2.(1) of Division A and to buildings to which Part 9 applies [see Sentence
1.3.3.3.(1) of Division A for application
of Part 9] that are required to be designed in accordance with the requirements
of Part 4.
INTENT:
To limit the probability that the calculation of loads due
to earthquake will not take into account the properties of the structural
system [i.e. lack of ductility, energy absorption and overstrength], which
could lead to:
- the excessive deformation of, or excessive stress in, the structural elements, which could lead to damage to the building, or
- the excessive deformation of, or excessive stress in, the building structure, which could lead to damage to the building, which could impede the intended use and occupancy of the building.
To limit the probability that the lateral-force-resisting
system chosen for the design will not have a minimum ductility, integrity,
and overstrength to absorb local failure due to maximum expected seismic ground
motions, which could lead to:
- the excessive deformation of, or excessive stress in, the structural elements, which could lead to damage to the building, or
- the excessive deformation of, or excessive stress in, the building structure, which could lead to damage to the building, which could impede the intended use and occupancy of the building.