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27 Cards in this Set
- Front
- Back
A reinforced concrete wall is limited to a slenderness ratio of
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25
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The longitudinal reinforcing in a tied column is held in place by stirrups, commonly a No. 3 or No. 4.
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false
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Formwork is a permanent structure that supports its own weight and that of the freshly placed concrete as well as the construction live loads including materials, equipment, and workmen
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false
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For maximum strength, the direction of plyform grain in the face layers should be placed parallel to the span
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true
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The failure mode for a stud is crushing
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false
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Partially seasoned wood is used for formwork because it is the most stable. Fully dried lumber will warp and crack during hot weather, while green timber will swell excessively when it becomes wet
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false
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After the forms have been removed, shores are placed snugly under a concrete slab.
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false
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Inadequate bracing and vibration are causes of formwork failure.
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true
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In slab form design, the horizontally spanning members are assumed to be continuous beams and are therefore statically determinate.
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false
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Shores and mudsills must rest on frozen ground
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false
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??? hold concrete forms secure against the lateral pressure of unhardened concrete
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Ties
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??? or column clamps encircle column forms and hold them together securely.
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Yokes
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The applicable adjustment factors for allowable bending stress are load duration, wet service, size, flat use, temperature, and stability.
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false
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Two main factors that affect the design load/lateral pressure in concrete wall forms are
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TEMPERATURE AND RATE OF PLACEMENT OF CONCRETE
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List two job built form work components that behave like a beam
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STRIGERS AND JOISTS, WALES
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List two objectives of the form builder
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QUALITY and SAFETY
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Slab formwork is designed for nonuniformly distributed vertical loads
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false
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The definitive design specification for reinforced concrete in North America is the
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ACI CODE
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A major source of cracking in concrete is structural action
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True
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One way to resist cracking in concrete is to use
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CONTROL JOINTS
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Reinforced concrete beams subjected to bending moments develop cracks that extend almost to the ??? where the strain is zero
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NEUTRAL SURFACE/AXIS
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Why does concrete crack
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LOW TENSILE STRENGTH
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To ensure that wet concrete mix passes through the reinforcing steel without separation, the code specifies minimum ??? of steel bars.
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spacing
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• Over-reinforced beams have a ductile failure which is why the code specifies a maximum amount of tensile steel reinforcement.
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false
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For reinforced concrete beams, the stirrups are placed to resist cracks due to???
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Shear
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In reinforced concrete, the reinforcement is designed to resist ??? while the concrete is designed to resist ???
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TENSILE FORCES/TENSION...COMPRESSIVE FORCES/COMPRESSION
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• One of the reasons the coed specifies minimum concrete cover is to ensure that there is adequate bonding between the coarse aggregate and the steel reinforcement
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false
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