The floor support plate does not require bolts to be designed according to the composite beam, but it must be constructed according to certain bolts to ensure the integrity of the plate and beam. The direction along the rib on the beam support, whether it is continuous or hinged, depends not on the profiled steel plate, but on the negative bending moment reinforcement. The compression of the profiled steel plate can be completely ignored, and the vertical rib direction is generally considered as hinged, but should be equipped with crack resistant structural reinforcement.
Regarding the reinforcement calculation of the floor support plate, there are two issues: one is the upper reinforcement (including negative bending moment reinforcement), and the other is the lower load-bearing reinforcement.
The upper reinforcement, also known as distributed reinforcement temperature reinforcement, mainly plays a role in resisting the tensile stress generated by temperature changes and concrete shrinkage in the direction perpendicular to the slab span. Usually, the diameter of the steel bars should not be less than 6mm and the spacing should not exceed 250mm. The calculation method for the upper reinforcement of the profiled steel plate floor slab is the same as that of the ordinary concrete floor slab, and can be calculated according to this method.
The lower steel bars mainly bear positive bending moments, and can be considered in two aspects: composite and non composite slabs based on the type of profiled steel plates. Both the upper and lower steel bars need to consider the thickness of the protective layer of the floor slab, and the lower steel bars are particularly not allowed to be placed directly on the profiled steel plate.
The reinforcement of composite floor sections can be in the following forms: when the profiled steel plate in the positive bending moment area of the composite floor bearing plate meets the requirements for bending bearing capacity, the positive bending moment area may not be equipped with reinforcement, and the load-bearing reinforcement can only be installed in the negative bending moment area and the temperature crack resistance reinforcement can be installed on the top surface of the floor; When the profiled steel plate in the positive bending moment area of the composite building support plate cannot meet the requirements for bending bearing capacity or the fire resistance limit calculation cannot meet the requirements, load-bearing steel bars can be configured in the positive bending moment area; When the composite floor support plate is subjected to significant tensile stress, steel mesh can be arranged at the top of the rib of the floor support plate.
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