Creep is the plastic permanent deformation of a structure under constant load for a very long period of time.
It can occur as a result of long-term exposure to high levels of stress that are still below the yield strength of the material. Creep is more severe in materials that are subjected to heat for long periods and generally increases as they near their melting point.
The creep strains occur due to dead load only.
Factors affecting creep
Type of loading
Magnitude of load
If the temperature is more, creep is more, and if the temperature reaches half of melting point temperature the creep is intolerable. Such a temperature is defined as homologous temperature.