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 .
内容
- 0
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
- 1
Concrete is basically a compressive material and has good tensile strength.
- 2
拉伸强度的英文是 A: tensile strength B: tensile yield C: elongation at break D: tensile fracture stress
- 3
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
- 4
For concrete specimen subjected to uniaxial compression, the stress reaches the maximum when the strain reaches the ultimate compressive strain.