Folded Plate Roof Construction Details

Folded plate roofs are roofing systems chosen for their high weight bearing capacity and their durability.

Folded plate roof construction details. The use of concrete as a building material reduces both materials cost and a construction cost. The slab between columns must be designed as a beam and it may be convenient to extend the main roof slab as a cantilever canopy. Pitch for a gable roof the most common is generally 1 4 or 1 3. The building was designed in the shape of an octagon incorporating 8 separate gables each engineered as a folded slab.

Flat shapes by choosing certain arched shapes. Due to the difficulty of holding these inserts in place during casting one half inch steel plates threaded to receive three fourths of an inch bolts from. The first folded plate roofs were used in germany in the 1920 s mainly for very large factory buildings such as coal bunkers. The construction method and design rationale as developed in china are be.

Folded plate structures are assemblies of flat plates or slabs inclined in different directions and joined along their longitudinal edges. Pitch is the slope or angle from the wall plate to the roof ridge line. To span 30 m shell thickness required is 60 mm only. Mezzanine ceiling structure constructed as a wooden folded structure represents a trapezoidal crease with elements of veneer plywood and horizontal parts of the folded structure are made of solid wood.

This type of ceiling called trofdek patented in england is a miniature version of the folded structure. Rise of roof may be a disadvantage. The usual upturned edge plate can be eliminated and the roof structure can be made to appear very thin if the edge plate is replaced by a series of columns. Thus the fold plate construction defining an essentially upwardly concave interruption to the major supporting surface forms through its integrally connected portions a beam from the folded slab.

Edge supported folded plates. They can be best described as assemblies that consist of flat slabs or plates that are inclined in different directions and are joined along their edges at the top. Good labor and supervision necessary. The center to center longitudinal span is forty 40 feet and in the transverse direction the columns are spaced at ten 10 feet on centers.

Which is equal to 1 4 or 1 3 the total span of the building not counting any overhang. In this way the structural system is capable of carrying loads without the need for additional supporting beams along mutual edges. The first three sections which were cast employed concrete inserts. Precast prestressed folded plate roof elements are cast flat with hinges between panels.

This technique originated in germany in the 1920s and became popular in russia and the united states during the 1930s to construct roofs for industrial warehouses and public buildings. It consists of a four bay folded plate structure carried by ten 10 concrete columns originally intended to cover a parking space for eight standard size vehicles with access from both ends. Greater accuracy in formwork is required. Pitch can vary a great deal from a shallow slope up to a very steep pitch.