In the calculation of the bearing capacity of the normal section of a T-shaped reinforced concrete beam, it is assumed that ( ) within the effective width of the compressed flange.
A: the compressive stress is uniformly distributed
B: the compressive stress is distributed in a parabolic shape
C: the compressive stress is distributed in a triangle shape
D: the compressive stress is distributed partly uniformly and partly non-uniformly
A: the compressive stress is uniformly distributed
B: the compressive stress is distributed in a parabolic shape
C: the compressive stress is distributed in a triangle shape
D: the compressive stress is distributed partly uniformly and partly non-uniformly
举一反三
- 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
- For axial compression members, because the normal stress on the cross section is evenly distributed, it is not necessary to consider the reasonable shape of the cross section
- In the calculation of the bearing capacity of the normal section of a doubly reinforced concrete rectangular beam, if [img=63x27]1803b9532781df8.png[/img], it indicates that ( ). A: the compressive reinforcements will not yield B: the tensile reinforcements will not yield C: the section is over-sized D: the compressive reinforcements have already yielded when the failure of the beam occurs
- 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