Floor Diaphragm Bracing

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Floor diaphragm bracing. This load path may be a floor or a normal flat plasterboard ceiling acting as a diaphragm. Most walls rely on support from this ceiling or floor diaphragm to prevent them from blowing over. The wind produces a lateral load which must be transferred through the structure to the foundation. The diaphragm of a structure often does double duty as the floor system or roof system in a building or the deck of a bridge which simultaneously supports gravity loads.
A diaphragm is a horizontal or near horizontal bracing element that transfers forces between vertical bracing elements. Diaphragms are usually constructed of plywood or oriented strand board in timber construction. In timber floors for example the floor sheeting carries the shear forces while perimeter joists. Similar to a shear panel a horizontal diaphragm is a horizontal truss in a roof plane or solid sheet element in a floor.
They are then transferred through the ceiling diaphragm to the bracing walls. All floor solutions involving permanent formwork such as metal decking fixed by through deck stud welding to the beams with in situ concrete infill provide an excellent rigid diaphragm to carry horizontal forces to the bracing system. Floor systems involving precast concrete planks require proper consideration to ensure adequate transfer of. These transmit them to the floor structure foundations and then into the ground.
The ceiling and floor form a horizontal diaphragm. The wind forces are transmitted to the ceiling diaphragm from the walls and also the roof. The diaphragm does not count in the bracing design for either level but. Bracing is required to withstand the wind pressure on the timber framed structure.
The wind force is transmitted through the ceiling diaphragm to the bracing walls which transmit them to the.