Module 2 Flashcards
is used to transfer the lateral forces acting on the structure to the foundation
lateral force-resisting system
are used to provide a continuous load path
vertical and horizontal
consists of frames (beams and columns), shear walls, or a combination of both (dual system).
structural framing systems
connected at floor level by diaphrams
structural framing systems
bearing wall systems has ____ to support most of the gravity load and resist all lateral forces
shear walls
bearing wall systems shear walls receive the shear force from the floor diaphragms and transfer the lateral force to the _____
foundation
bearing wall systems lacks ____
redundancy
bearing wall systems has a comparatively _____ of the response modification coefficient R
low value
bearing wall systems consists of vertical load carrying walls located along ____ and at ____ as necessary
exterior wall lines
interior locations
common for wood-frame buildings, concrete tilt-up buildings, and masonry walls buildings
bearing wall systems
provides support for both gravity and lateral laods
moment-resisting frame systems
are detailed to guarantee the large inelastic displacements without compromising the structural integrity of the frame
special reinforced concrete of moment-resisting frames
moment-resisting frame systems has no diagonal bracing or ____
shear walls
in moment-resisting frame, ____ allow for architectural design freedom
open bays
no restrictions on height
moment-resisting frame systems
has considerable flexibility and high inelastic deformation capacity
moment-resisting frame systems
moment-resisting frame systems highly ___
redundant
moment-resisting frame systems with ___ of the response modification coefficient R
high value
moment-resisting frame requires ___
strong-column or weak-beam design
consists of two independent systems, one to provide support for gravity loads, the other to resist lateral loads
building frame systems with shear wall
the ___ resist all lateral loads, and a column and beam frame support most gravity loads
shear walls
in building frame systems with shear wall, ________ is not required since gravity frame does not contribute to lateral resistance
special ductile detailing
gravity and lateral-force systems are ____
independent
building frame systems with shear wall has ____ of the response modification coeff. R
high value
shear walls must ____ from the foundation to the roof without offsets or extensive openings
extend
No seismic design
building frame systems with braced frames
consists of a braced frame that resists lateral loads by truss action and an independent moment frame that supports most gravity loads
building frame systems with braced frames
it has more ductile and provides more architectural design than a shear wall
building frame systems with braced frames
types of bldg. frame systems with braced frames
- special steel concentrically braced frames
- ordinary steel concentrically braced frames
- buckling-restrained braced frames
- steel eccentrically braced frames
in special steel concentrically braced frames, the ____ of all the frame members, beams, columns, and braces are coincident
centerline
in special steel concentrically braced frames, ______ are resisted by axial forces in the members
applied lateral loads
in special steel concentrically braced frames, ______ are placed on the slenderness and compactness of the brace.
limits
in special steel concentrically braced frames, ______ must be designed to resist the yield strength of the brace.
brace connections
in ordinary steel concentrically braced frames, similar to special steel concentrically braced frame but with ______ of the response modification coeff. R
lower value
remains elastic under a seismic excitation
ordinary steel concentrically braced frames
does not require the special seismic detailing
ordinary steel concentrically braced frames
in ordinary steel concentrically braced frames, _____ is also permitted for ordinary steel concentrically braced frames but not for special steel concentrically braced frames
K-bracing
a special type of concentrically braced frames
buckling-restrained braced frames
in buckling-restrained braced frames, _____ are used that consist of a steel core surrounded by a casing of steel and mortar to prevent the core from buckling
special braces
more ductile than a special steel concentrically braced frame
buckling-restrained braced frames
buckling-restrained braced frames and steel eccentrically braced frames has a _____ of the response modification coeff. R than a special steel concentrically braced frame
higher value
one end of the brace is connected to the frame
steel eccentrically braced frames
link acts as a structural fuse by providing inelastic behavior
steel eccentrically braced frames
provides lateral stiffness
steel eccentrically braced frames
provide architectural design freedom design
steel eccentrically braced frames
less damage to architectural and nonstructural elements during earthquake
steel eccentrically braced frames
more expensive than a special steel
steel eccentrically braced frames
has a secondary lateral support system coupled with the primary non-gravity-load-bearing lateral support system
dual systems
in dual systems, the moment-resisting frame must provide resistance to at ____ of the seismic forces.
least 25%
it is basically a dual system
shear wall-frame interactive system
in shear wall-frame interactive system, ____ and ____ are designed to resist lateral forces in proportion to their rigidities
shear walls and frames
use in zones with low seismicity
shear wall-frame interactive system
in shear wall-frame interactive system, _____ is not required
special seismic detailing
consists of a structure supported on columns cantilevering from their base
cantilever column systems
cantilever column systems lacks ____
redundancy
excessive flexibility of the system leads to excessive drift and P-delta instability
cantilever column systems
cantilever column systems has ____ for the response modification coeff. R
low value
