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A backfill material is described as sand-silt clay mix with plastic fines. The Unified Soil
Classification is SM-SC. Per ASCE 7-16, the estimated design lateral soil load (psf/foot
of depth) for relatively nonrigid walls is most nearly:
A. 35
B. 45
C. 85
D. 100 -ANSWERS-C is correct.
- ASCE 7-16 design loads table 3.2-1 p.11
Which of the following characterizes the typical failure of an over reinforced concrete
beam that has a reinforcement ratio higher than the balanced ratio?
A. the steel yields, and large deflections and tensile cracks will be observed prior to
failure.
B. the concrete crushes, and large deflections and tensile cracks will be observed prior
to failure.
C. the steel yields, and the beam fails suddenly without warning.
D. the concrete crushes, and the beam fails suddenly without warning. -ANSWERS-D is
correct.
- balanced - concrete & steel reach their yield strain simultaneously
- under-reinforced - steel reaches yield strain before concrete and failure is slowly
apparent through excessive deflection and cracking
- over-reinforced - concrete fails before steel and failure is sudden
, According to IBC 2018, which of the following represents the minimum factor of safety
against uplift of deep pile elements due to wind or seismic loading? (Select the two that
apply)
A. one and one-half when capacity is determined by approved load tests
B. two when capacity is determined by approved load tests
C. two when capacity is determined by an approved method of analysis
D. three when capacity is determined by an approved method of analysis
E. four when capacity is determined by an approved method of analysis -ANSWERS-A
and C are correct.
- IBC 2018 section 1810.3.3.1.5 lists 1) minimum factor of safety of two where capacity
is determined by an analysis
2) and one and one-half where capacity is determined by load tests
According to IBC 2018, which of the following represent the minimum compressive
strength of a precast concrete pile before driving? (select the two that apply)
A. 75% of the specified compressive strength
B. 80% of the specified compressive strength
C. not less than the strength sufficient to withstand handling and driving forces
D. one and one-half times the sufficient strength to withstand initial prestress load upon
transfer
E. must be determined by load testing -ANSWERS-A and C are correct.
- IBC 2018 section 1810.4.1.1 states that a precast concrete pile shall not be driven
before the concrete has attained compressive strength not less than 75% of the
specified compressive strength, also not less than the strength sufficient to withstand
handling and driving forces.
According to AISC Steel Construction Manual, 15th edition, the resistance factor = 0.90
and the safety factor = 1.67 apply to which of the following limit states? (select the four
that apply)
A. tensile yielding in the gross section
B. tensile rupture in the net section
C. compressive failure including consideration of all buckling modes