For fully prestressed concrete under the service load, in the section of concrete member
A: Tensile stress is allowed to occur
B: No tensile stress occurs
C: Allow for cracks
D: There is no compressive stress
A: Tensile stress is allowed to occur
B: No tensile stress occurs
C: Allow for cracks
D: There is no compressive stress
举一反三
- On the top of the concrete pavement, （） is developed during day time. A: tensile stress B: shear stress C: compressive stress D: bulk stress
- Under a certain long-term load, concrete would creep. In the reinforced concrete axial compressive members: A: Creep increases the compressive stress of concrete. B: The compressive stress of concrete and steel bar keeps unchanged. C: Creep decreases the compressive stress of concrete and increases the compressive stress of steel bar. D: Creep increases the compressive stress of concrete and decreases the compressive stress of steel bar.
- The cross section of a straight beam remains plane when the beam deforms due to bending. This causes ( ) on one side of the beam and ( ) on the other side. The neutral axis is subjected to ( ) .? normal stress; shear stress; zero stress|tensile stress; compressive stress; zero stress|compressive stress; tensile stress; maximum normal stress|shear stress; normal stress; zero stress
- The cause of cracks in concrete are: stress due to applied （） and stress due to temperature or （） change when concrete is restrained。
- If the normal stress on the cross section of the axial tensile rod is σ, then the normal stress and shear stress on the 45° degrees section are .