Learn about the advantages and disadvantages of real steel truss floor decks

Nowadays, the steel bar truss floor deck is a kind of roofing plate often used in the workshop, and there are many models, there are closed, open, steel bar trusses and many other floor deck plates, and the steel bar truss is a composite floor deck that processes the steel bars in the floor slab into a steel bar truss, and connects the steel bar truss and the bed mold into a whole.

In fact, the steel truss floor bearing plate is welded by steel bars and galvanized sheets, and the steel truss is welded by a large number of steel bars, which mainly plays a supporting role. After so many years of experience, the advantages and disadvantages of steel truss floor decks have also been revealed. The following small series will explain the advantages and disadvantages and scope of application of steel truss floor bearing plates.

The steel truss floor bearing plate has high degree, light weight and high rigidity, which is especially suitable for the construction of large-span, ultra-high and overweight buildings. Due to the large amount of reinforcement, the truss withstands a large unsupported span. Therefore, for buildings with a span of more than 4.5m, it is more advantageous to choose a reinforced truss slab than a floor slab load-bearing slab, because a large unsupported span can be made. The suitable span of the floor slab is within 3.6 meters, which is cost-effective. The cost of more than 4.5 meters is more expensive than that of steel truss plates, and the construction is relatively troublesome.

Secondly, the steel truss floor bearing plate has good uniformity and isotropy, which is an ideal elastomer, which conforms to the basic assumptions of general engineering mechanics. Due to the large number of steel bars, it can bear a large bearing capacity in the later stage, and is more suitable for buildings with a bearing capacity of more than 1.5 tons in the later stage (the floor load-bearing plate requires a large amount of reinforcement). There is also a more suitable industrial plant with low floors. In this way, the disadvantage of the steel truss slab occupying a large number of cranes in high-rise buildings can be avoided.

Third, it is cost-effective, which can improve the construction quality and reduce the decoration cost and construction period. The stress distribution is reasonable, which ensures the construction quality and improves the service life of the building. Good crack resistance and fire resistance.

So what are the disadvantages of steel truss floor decks?

1. For spans within 3.6m, I don't think the price of steel trusses is cheap;

2. The transportation cost is high, and the lap damage may be caused in the long-distance transportation process, which needs to be repaired at the construction site, which affects the installation progress and increases the installation cost. In severe cases, it will affect quality and construction safety;

3. It has good plasticity, toughness, large deformation, and can withstand dynamic loads well. In the construction process, due to the large weight of the veneer of the steel truss slab (two workers can't lift it, but two workers can lift the floor slab), more cranes are used, which will affect the progress of other operations, and the installation cost is also more expensive (about three times the cost of floor slab installation).

Generally speaking, for steel structure buildings with large spans and large enough areas, it is recommended to choose steel truss floor decks, so that the overall cost will be lower and the construction period will be faster.