Do you have to bend the anchor for the end anchorage of beam reinforcement? Standardize? Still long enough?

The anchorage must conform to the length specified in the atlas 10 1. If the end position is not enough for direct anchorage, the anchor must be bent, and the straight length of the elbow is 15D.

The principle of steel bar anchorage:

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2. The principle that the anchorage of longitudinal reinforcement at the end support should not be completely covered by protective layer. When the horizontal section is covered by concrete protective layer, the hook section should be "embedded" in the reinforced concrete inside the end corner reinforcement;

Extended data:

Reinforcement anchorage

Specification for anchorage length of reinforcement: In the foundation theory of concrete structure, the reinforcement with too high strength can't give full play to its function due to the ultimate strain value of concrete (this is the theoretical basis for not setting ⅳ reinforcement in the design specification and construction specification of concrete).

Therefore, even for Grade IV reinforcement, the strength design value can only be 360N/mm2 (the same as Grade III reinforcement), and it can only be 300N/mm2 when it is used for axial tension and small eccentric tension members. Therefore, the anchorage length of steel bars higher than Grade III can be determined according to Grade III steel bars.

The plasticity and weldability of grade Ⅳ steel bars are worse than those of new grade ⅲ steel bars, so it is not suitable and economical to use them in ordinary concrete structures.

In addition, when the rebar is HRB335 and HRB400 and the diameter is greater than 25mm, the anchorage length should be multiplied by the correction factor 1. 1.

In the earthquake area, a coefficient should be multiplied by the earthquake grade: the time coefficient of earthquake grades I and II is1.15; The third-order time coefficient is1.05; The four-level time coefficient is 1.0.

The anchorage length of compressive reinforcement in concrete is 0.7 times that of tensile reinforcement.

The above is the calculation method of reinforcement anchorage length. In the design description part of the construction drawing, there are generally requirements for the anchorage length of steel bars, which can be checked according to the requirements in the drawings.

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