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 specific meaning of the terms "reinforced concrete and prestressed concrete" are ______ .
- 4
In general, the damping ratio of steel structures is than that of the reinforced concrete structure. That is, the seismic action of the steel structure is than that of the reinforced concrete structure under the same structure period, mass and other parameters. ( ) A: smaller smaller B: smaller larger C: larger smaller D: larger larger