1. At the grid point of the intersection of two directional beams, the longitudinal tensile reinforcement under the short-span directional beam should be placed under the longitudinal tensile reinforcement under the long-span directional beam, in the same direction as the reinforcement of the two-way slab.
2. The grid point of the beam at the intersection of two directions can not be regarded as the general support of the beam, but as the elastic support of the beam, and the beam only has two supports at both ends. When the stirrup can not meet the end shear force, the maximum end shear force is subtracted from the shear force borne by the stirrup. The rest of the shear force is solved by increasing the reinforcement of the bent duck. The structural requirements for duck reinforcement should be that the distance from the inner edge of the end bearing to the bending starting point of the first row of reinforcement should not be less than 50 mm
3. Because the beams in two directions are not primary and secondary beam structures, there is no need to set additional transverse reinforcement for the beams in two directions at grid points. However, at the grid point, the beams in two directions should be equipped with an appropriate amount of structural negative reinforcement at the upper part, which should not be less than two Ф12, so as to prevent the possible negative bending moment when the load is unevenly distributed. This negative reinforcement is generally equivalent to 1/4~ 1/5 of the cross-sectional area of the main reinforcement of the lower longitudinal tensile reinforcement.
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