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Which types of loads must building structures be designed to support?
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Apartment buildings under construction in Cambridge, England.
Building structures must be designed to support several types of loads to ensure they transmit forces safely to the ground without exceeding allowable stresses. These loads are generally categorized as follows:1
- Dead Loads: These represent the inherent weight of the building structure itself, including all permanent components like walls, columns, and beams.23
- Live Loads: These are temporary or variable loads that a structure must carry, such as the weight of occupants, furniture, and equipment.2
- Vertical Gravity Loads: Under normal conditions, structural elements primarily experience these downward forces of compression.34
- Lateral Loads: These are horizontal forces that act on a building, primarily caused by environmental factors.4
- Wind Loads: Tall buildings act like cantilever beams, experiencing pressure that causes bending, sidesway, and potential swaying due to vortex shedding.4
- Seismic (Earthquake) Loads: During an earthquake, structures are subjected to sudden ground shaking, which creates lateral and shear loading, resulting in tensile and torsional forces.34
Engineers must account for these forces to maintain stability and prevent structural failure.341