The space frame steel structure truss floor deck adopts galvanized steel plate, which has anti-corrosion function, but the function of galvanized steel plate is not considered in the use stage, and no anti-corrosion treatment is required. Compared with the profiled steel plate composite floor slab, the steel structure truss floor slab has better anti-corrosion performance. The overall rigidity of the floor slab is large, the vibration is small, the sound insulation performance is good, and the lower surface of the floor slab is flat, which is easy for building decoration. The construction deflection of the steel structure truss floor bearing slab is less than the deflection of the traditional profiled steel plate floor. The self-weight of the concrete floor slab is completely borne by the steel structure, and no tensile stress is generated in the concrete. The tensile stress of the concrete in the negative and positive bending moment areas is significantly reduced during the use stage, and the crack width is reduced. The existence of galvanized steel plate avoids exposed cracks under the floor. , Improve the performance and durability of the floor slab. After adopting steel structure truss floor bearing slab in Mining University Gymnasium, the floor slab can be designed as a two-way slab according to the needs, which is equivalent to the traditional two-way reinforced concrete floor slab with cast-in-situ steel structure. However, it is difficult to realize the two-way slab for the profiled steel plate composite floor. The slab not only reduces the thickness of the floor structure, lowers the structural weight, and increases the span and bays, but it is also more economical and reasonable. The steel structure is completely wrapped by concrete and has reliable fire resistance, which is equivalent to the traditional cast-in-place floor slab. The test results indicate that when the floor slab is 100mm thick (the corresponding steel structure truss height is 70mm), the fire resistance time limit is 1.68 hours, and the galvanized steel plate does not need fire protection.
