1. The joint should be set as far as possible in the place where the force is small, and the key part of the structure where the force is large should be avoided. In the seismic design, avoid the beam-end and column-end stirrup reinforcement ranges. If it is necessary to connect in this area, mechanical connection or welding should be used.
2. There should be few connection joints on the same reinforced bar in the same span or the same floor height, and it is not appropriate to set up 2 or more joints.
3. The joint positions should be staggered from each other. Within the connection range, the percentage of the joint reinforcement area should be limited to a certain range.
4. Necessary structural measures should be taken in the area of steel reinforcement connection, and transverse structural steel bars or stirrups should be arranged within the overlapped length of the longitudinally stressed steel bars.
5. Axial tension and small eccentric tension members (such as truss and arch tie rods) should not be used for longitudinal reinforcement of ties.
6. When the diameter of the tensile steel bar d> 25mm and the diameter of the compressed steel bar d> 28mm, it is not suitable to use lap joints.
