举一反三
- Reinforced concrete has steel bars that are placed in the concrete to carry tensile forces.
- Concrete is basically a compressive material and has good tensile strength.
- The truncated position of the longitudinal steel bar in the reinforced concrete beam is at the point where the steel bar is fully utilized.
- The reinforced concrete construction with aluminum surface enhanced structural design and reduced its costs.
- 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.
内容
- 0
A reinforced concrete rectangular beam of C40 grade concrete is reinforced with HRB400 grade steel bars in tension. Given that [img=14x23]17de816843b92c0.png[/img] is 1.71[img=62x27]17de81684ecebb0.png[/img] and fy is 360[img=62x27]17de81684ecebb0.png[/img] the minimum reinforcement ratio of longitudinal tensile reinforcements should be ( ). A: 0.18% B: 0.19% C: 0.20% D: 0.21%
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The adoption of structural steel and reinforced concrete caused major changes in traditional construction practices. Which one is the wrong description about reinforced concrete? A: build more solid structures B: much simpler to build fire-resistant floors C: increase the cost of construction D: become possible to erect buildings with greater heights and longer spans
- 2
Modern concrete blends are reinforced with steel fibers and __________ for strength and to prevent cracking.( ) A: water reducing fibers B: water condesation polymers C: water tower D: water reducing polymers
- 3
The truncated position of the longitudinal steel bar in the reinforced concrete beam is at the point where the steel bar is fully utilized. A: 正确 B: 错误
- 4
The specific meaning of the terms "reinforced concrete and prestressed concrete" are ______ .