The longitudinal reinforcement in the upper part of continuous beam and frame beam should pass through the anchorage length in the intermediate support or intermediate node. See simply supported beam end support. ?
2. End nodes of frame beams. The upper longitudinal reinforcement shall extend out of the center line of the joint. When the horizontal anchorage length is not enough, it should be bent down along the outside of the column joint, but the horizontal anchorage length before bending is ≦0.45la(la is the minimum anchorage length of longitudinal reinforcement), and the vertical anchorage length after bending is ≦ 10d, and should not be > > 22d.
See simply supported beam end support for the anchorage length of the lower longitudinal reinforcement extending into the end node. At the top corner joint of the frame, the steel bar at the upper part of the beam should extend into the column and overlap with the steel bar at the column. During construction, special attention should be paid to the bending radius of the upper reinforcement. When the bending radius of reinforcement is 5d, it can always be guaranteed. When the bending radius is 15d, the fabrication of steel bars is easily neglected, which is very unfavorable to large eccentric columns. ?
3, bending steel bar should have enough anchorage length outside the bending point.
Extended data:
Calculation method
In addition, when the nominal diameter of ribbed bar 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.
When the compressive strength of longitudinal compressive reinforcement in concrete is fully utilized, its anchorage length should not be less than 70% of the corresponding tensile anchorage length.
When hook or mechanical anchorage measures are adopted at the ends of ordinary steel bars in longitudinal tension, the anchorage length (extension length) including hook or anchorage end can be taken as 60% of the basic anchorage length.
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.