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This is because of the force transmission performance (strength, deformation, restoring force, failure state, etc. The lap joint of steel bar is not as good as the integral steel bar, which will weaken its force transfer performance.
Therefore, the reinforced lap joints should be set in the position with less stress, so as to limit the number of lap joints in the same span or the same reinforced height, avoid the key stress parts of the structure, such as the stirrup encryption area at the column end and the beam end, and limit the percentage of lap joint area.
Extended data:
Precautions:
1. The longitudinal reinforcement and stirrup of beams and columns shall be fixed with iron wire at the intersection.
2. Except for special design requirements, stirrups of beams and columns should be equidistant and perpendicular to the steel bars, and the joints of stirrup hooks should be staggered along the steel bars.
3. At the longitudinal reinforcement joint of the beam, the hook surface should be perpendicular to the lower formwork surface.
4. When users lap the longitudinal reinforcement column, the included angle between the hook plane and the rectangular column in the template plane should be 45, the polygonal column should be the bisector of the internal angle, and the annular reinforcement in the hook plane should be perpendicular to the section of the template.
And the middle hook plane reinforcement should be perpendicular to the template plane. When the user uses the plug-in vibrator to pour the small section column, the included angle between the hook surface and the formwork surface should not be less than 15.