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The requirements of concrete structures for the performance of steel bars

Author : hongteng Time : 2020-11-12
1) Requirements for reinforcement strength  
Common steel bar is non-prestressed steel bar in reinforced concrete structure and pre-stressed concrete structure, mainly hot rolled steel bar such as HPB235、HRB335、HRB400、RRB400.
2)  Requirements for a strong yield ratio
In the design, the appropriate bending strength ratio should be selected. For seismic structures, the stress of steel bars can be considered into the strengthening section under seismic action. In order to ensure that the structure "crack but not fall" under strong earthquake, the ratio of ultimate tensile strength to yield strength should not be less than 1.25.
3) Ductility
In engineering design, the limit state of bearing capacity of reinforced concrete structure is required to have obvious omen, avoid brittle failure, and seismic structure requires sufficient ductility. The strain value between the yield point and the limit strain point on the stress-strain curve of steel bar reflects the ductility of steel bar.
4) Bondability
The durability of concrete structure refers to the degradation of material properties, components and structures with time in the external environment, mainly including the mechanism of steel bar corrosion, freeze-thaw cycle, alkali-aggregate reaction, chemical action and physical, chemical and biochemical processes. The decrease of durability of concrete structure can cause the decrease of bearing capacity and affect the safety of structure.
5) Durability
The durability of concrete structure refers to the degradation of material properties, components and structures with time in the external environment, mainly including the mechanism of steel bar corrosion, freeze-thaw cycle, alkali-aggregate reaction, chemical action and physical, chemical and biochemical processes. The decrease of durability of concrete structure can cause the decrease of bearing capacity and affect the safety of structure.
6) Suitable construction
In construction, the steel bar should be bent and formed, so it should have certain cold bending performanc
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