What are the structural requirements of the board?

1, the minimum thickness of the plate is 2, and the stress of the plate. The reinforcement of the cast-in-place steel plate is usually selected according to the As value per meter of plate width. For example, as = 330mm2/m, φ 8 @ 150 (as = 335mm2/m) is selected from the attached table 1. 13, where 8 is the rebar diameter (mm) and 150 is the rebar middle distance (mm). In general, the rebar diameters of plates are 6, 8 and10 mm. When the thickness h of plates is less than or equal to 40 mm, steel wires with diameters of 4 and 5mm can also be selected ... The rebar spacing of plates should not be too dense or too thin. If it is too dense, it is difficult to pour concrete, and it is difficult to ensure reliable bonding between steel bars and concrete. If it is too thin, the concrete between the steel bars may cause local damage. The spacing between steel bars in the plate is generally not less than 70mm；; When the thickness is ≤ 150mm, it should not be greater than 200mm；; When the thickness h > h> 150mm, it should not be greater than 1.5h, nor should it be greater than 250 mm. 3. The distribution of reinforcement plates refers to the structural reinforcement arranged in the direction perpendicular to the stressed reinforcement. Its function is to transfer the load of the plate surface to the stressed steel bar more evenly; Binding or welding with the stressed steel bar to form a steel mesh, so as to ensure the correct position of the stressed steel bar during construction; Bear that internal force caused by the temperature change in the plate and the concrete shrinkage. The diameter of distributed reinforcement shall not be less than 6mm. The cross-sectional area of distributed steel bars per unit length should not be less than 15% of the cross-sectional area of reinforced bars per unit length in the other direction and 0. 15% of the cross-sectional area in this direction, and the spacing of distributed steel bars should not be greater than 250 mm. For precast slabs, when there is practical experience or reliable measures, the distribution of steel bars is not subject to this restriction. The above contents are compiled according to the problems encountered by the students in their actual work for reference. If in doubt, please communicate and correct in time.