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FLOOR DIAPHRAGMS. - Structural Engineers

FLOOR DIAPHRAGMS. Definition and function: A horizontal system (roof, FLOOR or other membrane or horizontal bracing) acting to transmit lateral forces to vertical-resisting elements. The floors and roof of a building, in addition to resisting gravity loads, are also generally designed to act as diaphragms. In this respect, they are required both to distribute seismic forces to the main elements of horizontal resistance, such as frames and shear walls , and also to tie the structure together so that it acts as a single entity during an earthquake. The robustness and redundancy of a structure is highly dependent on the performance of the diaphragms. Precast floors without an in-situ topping are not generally recommended in seismic areas.

diaphragms capable of transferring torsional and shear deflections and forces are also based on the assumption that the diaphragm and shear walls undergo rigid body rotation and this produces additional shear forces in the shear wall. Rigid diaphragms

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