The magnitudes of internal forces inside concrete floor diaphragms are significantly more complicated as compared to those supposed by some basic methods which are applied in current design practice, like the Equivalent Static Analysis (ESA) method. Reinforced concrete diaphragms (related to floors and roofs) regarding a structure attach the vertical structural components (like walls and frames) collectively so that the buildings can withstand outside loads like gravity and lateral forces from seismic events or wind action.įloor diaphragms are very crucial for transmitting the forces from the structure to the lateral force defiant components which then move the forces from the structure to the ground. Consequently, the impact of their in-plane movement concerning the vertical LFRS is ignored.Ī precast concrete diaphragm comprises of precast components having unnecessary cast-in-place pour strips along some or all boundaries and with or without cast-in-place topping slabs. In recent times, horizontal diaphragms are generally accepted to be rigid. To cope up with seismic loading, floor and roof systems in reinforced concrete (RC) buildings function as diaphragms to deliver the lateral earthquake loads to the vertical lateral force-resisting system (LFRS). This is a useful technical brief for all the civil engineers that briefly explains the concept of reinforced concrete diaphragms.
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