Читать книгу Strength Of Beams, Floor And Roofs - Including Directions For Designing And Detailing Roof Trusses, With Criticism Of Various Forms Of Timber Construction - Frank E. Kidder - Страница 7

Loads are also spoken of as “live” and “dead” loads. A dead load is one that does not move of itself, such as the weight of any kind of material or a brick wall, for instance. A live load is one that is constantly moving and quickly applied. Live loads that produce a decided impact or vibrations are nearly twice as destructive as those that remain perfectly still. The principal live loads met with in building construction are moving crowds of people, particularly if they move in regular time, as in dancing or marching; machinery and wind pressure.