Many architects hope that in the case of large overhanging or large span, the roof slab and floor slab can be thin, thinner and ultra-thin. But this is a big challenge for structural engineers. Because the stiffness of the plate is directly proportional
to the third power of the height of the section, if the thickness of the plate is reduced a little, the stiffness will decrease a lot. How to solve this problem? Let's take our time.
At present, no matter it is concrete structure or steel structure, the floor slab and load-bearing roof slab are basically cast-in-place concrete slab. Although it can well meet the needs of general buildings, its shortcomings are obvious in some buildings
with high requirements on appearance, practicability and construction period.
Taking the concrete structure as an example, firstly, the concrete slab needs to be wet operated on site, which prolongs the construction period; secondly, it is self important, which results in the small span of the slab, and the size of the bay
under the slab is strictly controlled. The force transfer mode of the main and secondary beams and the additional building surface layer reduce the building net height of the floor (as shown in Figure 1), which greatly limits the scope of building creation
and is not conducive to novel and unique buildings The birth of.
Taking steel structure as an example, grid structure is an excellent two-way force transmission space structure system, which is often used in large cantilever structure. However,
for the thickness of 1250, the finished surface needs 2050. The extra 2050-1250 = 800mm is the added thickness of purlin bracket, purlin and cladding keel. Architects hope that when the thickness of the structure is thin, the grid structure appears powerless.
Plate truss is a kind of light and ultra-thin space force transfer plate system, which has enough strength and stiffness, can carry out multi-directional cantilever, and does not need wet operation, so it has fast production and construction. The
steel plates on both sides act as both the stress-bearing structure and the enclosure structure. Compared with the existing technology, the beneficial effects of the plate truss are as follows: factory processing and production, on-site assembly, no wet
operation in the whole process, greatly shortening the construction period; canceling the primary and secondary beams, with small thickness and self weight, without building surface layer, increasing the clear height of the building; axial force, spatial
force transmission, improving the strength, stiffness and span of the plate in each direction, which is conducive to help architects realize the design idea Figure.