K-500 Flashcards
Truss members are generally subject to internal stresses that are axial. Which of the following will also cause bending stresses in truss members? Check all that apply. A. Using trusses without diagonals B. Closely spaced joists that span between trusses C. Truss joints that provide restraint against rotation D. Application of a load to a joint
A. Using trusses without diagonals B. Closely spaced joists that span between trusses C. Truss joints that provide restraint against rotation
During the design of a building, the deflection of a beam is calculated to be 0.90". In order to limit the maximum deflection of the beam to % inch, how should the design be changed? A. Substitute a beam having a section modulus 20 percent greater. B. Substitute a beam having a moment of inertia 20 percent greater. C. Substitute a beam having a moment of inertia 83 percent greater. D. Substitute a beam having a yield point 20 percent greater.
B. Substitute a beam having a moment of
inertia 20 percent greater.
Deflection = ( WL^3 ) / ( E I )
In designing a cantilever retaining wall, which of the following factors are considered? I. Overturning moment II. Sliding force III. Soil pressure under the footing IV. Bending moment in the stem A. I, II, and III B. II and IV C. I, III, and IV D. I, II, III, and IV
D. I. Overturning moment II. Sliding force III. Soil pressure under the footing IV. Bending moment in the stem
Overturning effects are MOST critical for which of the following? Check all that apply.
A. Buildings with a high height-to-width ratio
B. Buildings with a low height-to-width ratio
C. Tall, slender buildings
D. Short, squat buildings
E. Top-heavy buildings
F. Pyramid-shaped buildings
A. Buildings with a high height-to-width ratio
C. Tall, slender buildings
E. Top-heavy buildings
All of the following statements about shear walls are correct EXCEPT
A. a shear wall resists lateral forces from wind or earthquake by developing shear in its own plane.
B. a shear wall must be made of reinforced concrete or structural steel.
C. shear walls may be used with moment-resisting frames to form a dual system.
D. a shear wall is analogous to a vertical cantilever beam.
B. a shear wall must be made of reinforced concrete or structural steel.
The stress at which a ductile material continues to deform without an increase in load is called the _____
Yield Point
What does redundancy in a structure refer to?
A. Providing more structural members than are necessary to support the anticipated loads
B. Having the ability to redistribute loads to other structural elements in case of overload or failure
C. Having a structural system that is statically indeterminate
D. Having main girders that consist of two members each
B. Having the ability to redistribute loads to other structural elements in case of overload or failure
A commercial building assigned to SDC D has a fundamental period of 0.4 seconds, Sds = 1.0g, Sdi= 0.55g, R = 6, and W = 1,000,000 pounds. What is the base shear? A. 114 kips B. 121 kips C. 167 kips D. 209 kips
Base shear V = Cs W where
Cs= Sds x l/R.
The importance factor I is equal to 1.0 since this is not a high-occupancy, essential, or hazardous facility, R = 6,
Thus, Cs= 1.0 x 1.0/6 = 0.167.
Also, Cs need not exceed Sdi x I/TR, where
Sdi= 0.55g
T=0.4 seconds, as given. Thus, Cs = (0.55 x 1.0)/(0.4 x 6) = 0.229. Minimum C = s
0.01. Therefore, V = 0.167 x 1,000,000 =
167,000 lbs.= 167 kips.
A building with steel moment-resisting frames assigned to SDC D is 120 feet high and has a fundamental period of vibration of 1.29 seconds. If the building height were 240 feet and all other factors remained the same, the period would A. double. B. decrease by half. C. remain the same. D. increase about 75 percent.
D. increase about 75 percent.
The bracing of nonstructural elements must be designed to resist seismic forces that are
A. the same as those used for the design of the building.
B. usually smaller than those used for the design of the building.
C. usually greater than those used for the design of the building.
D. zero, since nonstructural elements are not required to be braced.
C. usually greater than those used for the design of the building.
A hole or notch for a pipe must be provided in a reinforced concrete beam. Where would the penetration LEAST affect the beam’s load-carrying capacity?
Middle 1/3 span of the beam
Which of the following statements about prestressed concrete construction is NOT true?
A. Precast, prestressed members usually require end anchorages.
B. Pretensioned members require no end anchorages.
C. Prestressing a beam results in a smaller section.
D. Posttensioned members usually require end anchorages.
A. Precast, prestressed members usually require end anchorages.
The allowable shear in a plywood diaphragm depends on all of the following EXCEPT A. plywood grade and thickness. B. direction of framing. C. nail size and spacing. D. width of framing members.
B. direction of framing.
Compared to a steel frame building, a reinforced concrete building has I. greater seismic load. II. greater wind load. III. greater weight. A. I and II B. I and III C. II and III D. I, II, and III
I. greater seismic load.
III. greater weight.
A special moment-resisting frame has an R value of 8. A concrete shear wall has an R value of 5. If all other factors are the same, the special moment-resisting frame should be designed to resist a seismic force that
A. is 50 percent greater than that for the shear wall.
B. is 37 .5 percent smaller than that for the shear wall.
C. is the same as that for the shear wall.
D. may be greater or smaller than that for the shear wall, depending on the SDC.
R= Ductility and is proportional
B. is 37 .5 percent smaller than that for the shear wall.
