Advantages and technical performance of reinforced truss floor bearing plate

Compared with the smaller slab thickness under the requirements of 1.5 hours floor slab fire resistance and fire resistant coating, the thickness of the slab is greater than 110 mm when choosing the silent pressure type plate, 130mm when choosing the open pressure type plate, 150mm when choosing the open pressure type plate, and 110 mm when choosing the systolic pressure type plate for the steel truss floor bearing plate. Or choose reinforced truss floor bearing plate is greater than 110mm.

LouCheng plate steel truss construction stage as the template, to apply the stage do steel composite floor slab steel sheet (such as closed, open steel sheet, neck, and pressed steel plate steel sheet, etc.), under the condition of steel and concrete composite floor slab burning refractory refractory function is different, the time, the composite floor slab composite floor slab, different degree of deformation and damage may occur, So steel is needed after the fire

After fire, two problems must be considered: whether the effective load area of the reinforced truss floor slab changes, whether the strength and ductility of the composite floor slab changes, and whether the load force meets the requirements of the floor slab. After the corrosion protection layer is damaged, how to deal with the corrosion protection life of steel plate bearing plate?

However, in the case of reinforced truss floor slabs, the compensation of the floor slabs after fire is the same as that of the traditional cast-in-place reinforced concrete floor slabs. The traditional cast-in-place reinforced concrete floor slabs have experience in the treatment of fire resistance compensation and do not have the problem of damage of anti-corrosion coating. The comparison of anticorrosion function uses open pressure plate, contraction neck pressure plate.

According to the UK standard, the time required for initial protection is 22.5 years at 275 g/m2, indoor and side measured borehole conditions. If the steel truss floor bearing plate is selected, in the construction stage of the steel truss floor bearing plate, only galvanized plate is used as the template, and no force is applied in the use stage, so the corrosion can be ignored. Bidirectional stress floor constitute the comparison shows that the steel truss floor bearing plate under the surface level off, without any increase in floor structure layer thickness on the bottom floor distribution under the condition of steel bar is more convenient, but other pressed board floor bearing plate (such as open pore pressure plate, neck contour plate narrowing) need to use special rib height contour plate making two-way slab, and then increase the total thickness of the floor structure layer, In order to improve the net height of the building, the calculation method of the reinforced truss concrete slab based on the bidirectional slab is the same as the general cast-in-place concrete planning theory, the stress mode of the reinforced truss is more reasonable, and provides both stiffness and bidirectional stiffness.

At present, multi - storey and high - rise steel structure floor slab is generally used in ribbed compression - concrete composite floor slab. The total thickness of the upper floor is large, the net height of the building is reduced, the lower surface of the floor is not smooth, the reinforcement is complicated, the reinforcement spacing and the thickness of the concrete protective layer are not well controlled, and the defects of the bi-directional plate cannot be caused.