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Last edited 23 Jan 2019
There are a number of different types of load than can act upon a structure, the nature of which will vary according to design, location, and so on. Design requirements are generally specified in terms of the maximum loads that a structure must be able to withstand.
- Dead loads, also known as permanent or static loads, are those that remain relatively constant over time and comprise, for example, the weight of a building’s structural elements, such as beams, walls, roof and structural flooring components. Dead loads may also include permanent non-structural partitions, immovable fixtures and even built-in cupboards.
- Live loads (applied or imposed loads) may vary over time. Typical live loads might include the weight of the audience in an auditorium, the books in a library, traffic loads and so on.
Dead loads comprise the weight of the structure or other fixed elements before any live loads are taken into consideration. Live loads are added to the dead load to give the total loading exerted on the structure.
Dead loads can be calculated by assessing the weights of materials specified and their volume as shown on drawings. This means that in theory, it should be possible to calculate dead loads with a good degree of accuracy. However, structural engineers are sometimes conservative with their estimates, minimising acceptable deflections, allowing a margin of error and allowing for alterations over time, and so design dead loads often far exceed those experienced in practice.
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