Abstract
Static behavior of H-shaped beam-columns under constant axial force and alternating horizontal force acting in an arbitrary direction is studied analytically. Analysis is based on the simplified model of a cantilever column in which deformable portion is concentrated near the column base with a certain length, where the curvature is assumed constant. Accuracy of the results is examined by comparing them with the results by more exact analyses, and the basic knowledge on the behavior of elasto-plastic beam-columns is obtained, which will be utilized in the dynamic analysis of space frames. Some observations from the results are as follows : (1) The results by the present method fairly well coincide with results by other exact analyses. Therefore, the present method can be applied to the dynamic analysis of space frames. (2) The elasto-plastic beam-column under horizontal force in the arbitrary direction presents complex and quite different characteristics compared with the beam-column under in-plane loading. (3) The restoring force characteristics of beam-columns under constant axial force and alternating horizontal force in the arbitrary direction gradually approach to those under no axial force as the number of loading cycle increases. This phenomenon is the same as in case of in-plane loading.
