Stress characteristics of reinforced truss floor bearing plates

1, floor deflection

General cast-in-place reinforced concrete floor slab, the construction stage due to the lower formwork so there is basically no deflection, when the concrete reaches a certain strength after the removal of the formwork, under the effect of dead weight floor bending, concrete tension and even cracks. The reinforcement truss concrete floor slab is separated according to the setting condition of temporary support as follows:

(1) Temporary support: it is basically the same as the general cast-in-place reinforced concrete floor slab;

(2) no temporary support: before the solidification of concrete, the dead weight of the formwork, the weight of concrete and the construction load are all accepted by the steel truss. Concrete is solidified under the deformation of the steel truss floor bearing plate, and the dead weight of the floor will not make the concrete at the bottom of the plate pull.

2, the bearing capacity of the floor

In the application stage, the upper and lower strings of the steel truss work with the concrete. The floor slab and the reinforced concrete composite slab have the same mechanical function. Although the tensile steel stress is ahead, its bearing capacity is the same as that of the general reinforced concrete slab.

The steel truss floor slab is a kind of unsupported special-shaped composite floor slab. Steel trusses are formed and processed in the background processing field. In field construction, the truss floor bearing plates should be placed in the correct orientation, welded into steel bars, then welded with studs and placed with steel trusses.