Intent 1:
To limit the probability that the design base shear
for the structural analysis of the building will not take into account
all the factors that affect the expected magnitude and distribution
of seismic forces and displacements in the building structure, 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.
Intent 2:
To limit the probability that the calculation of
loads due to earthquake loads will not take into account how the expected
fundamental lateral period of the building structure affects the seismic
forces and displacements in the structure due to the 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.
Intent 3:
To limit the probability that the calculation of
loads due to earthquake loads 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.
Intent 4:
To limit the probability that the lateral-force-resisting
system chosen for the design will not have a minimum ductility and
integrity 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.