In the structural design of the deformation on the timber floor and beam under vertical loads, the special considerations are required, compared with reinforced concrete and steel structures. The requirements come from joint deformation and creep behavior. In this paper, creep behavior of glulam beam, joint and frame are discussed experimentally focusing on temperature and humidity influence. The long-term creep behavior, which is estimated from short-term experimental results, is also discussed. Based on the discussion of experimental studies, following conclusions were obtained; 1) Under the non-controlled condition, the start timing influences the creep behavior. Concretely, the creep that was loaded from the end of summer or autumn doesn t increase by spring season. When spring comes, the creep increases rapidly. That means that long-term is required to evaluate creep behavior under non-controlled condition. 2) The creep behavior of joints is quick to be influenced by seasonal changes of temperature and humidity compared with beam without joint. 3) It is reasonable evaluation that a total deformation including creep is computed twice initial deformation. But the members, of which major deformation was accounted for the joint slip, should be paid attention to seasonal influence.
