Overlap of beam bars: When the diameter of the stressed steel bars of the beam is equal to or greater than 22mm, binding joints can be used, and the overlap length must comply with the regulations. The distance between the end of the lap length and the bend of the steel bar shall not be less than 10 times the diameter of the steel bar. The joints should not be located at the maximum bending distance of the component. The ends of the Class I steel bar binding joints in the tension area should be hooked (Class II steel bars may not be hooked), and the overlap should be firmly tied at the center and both ends. The positions of joints should be staggered. When binding lap joints are used, the cross-sectional area of ??the stressed steel bars with joints in any section of the specified overlap length accounts for the total cross-sectional area of ??the steel bars, and the tensile area should not exceed 50%.
Frame plate:
When tying the plate, straight buckles or eight-shaped buckles are generally used. Except for the intersection points of the two outer ribs, which should be fully tied, the other points can be staggered and tied (two-way plate) All intersection points must be tied). If the slab is made of double-layer steel bars, a steel horse stool must be added between the two layers of steel bars to ensure the position of the upper steel bars. Negative moment steel bars must be tied at each intersection point. Place mortar blocks under the steel bars with a spacing of 1.5m. The thickness of the pad is equal to the thickness of the protective layer and should meet the design requirements. If there is no requirement in the design, the thickness of the protective layer of the plate should be 20mm. The requirements for the overlap length and overlap position of the steel bars are the same as the beams mentioned above.
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