Behavior of Hollow Composite Steel-concrete Members under Long-term Axial Compression

Research results related to the behavior of hollow composite steel-concrete members under short-term loading are well known. Such members consist of two materials - steel and concrete with very different properties. They have different rheological behavior. Steel rheological behavior can be neglected at normal temperatures, but deformations are significant for concrete creep. Concrete creep phenomenon is well examined, but such knowledge cannot be applied directly to a composite member. Permanent actions are responsible for a large portion of external actions acting on compressed structural members. Research of composite members under long-term actions is necessary to ensure the reliable design of such structures.