EXPERIMENTAL RESEARCH OF FOUR DIFFERENT MODELS OF CAST-INPLACE RC FRAMES SUBJECTED TO A VERTICAL LOAD

摘要

A cast-in-place RC frame structure subjected to a uniformly distributed vertical load was investigated. The structure was designed by four different calculation methods, namely, the solid,truss, truss-shell and optimization models. Different from any other joint subassemblies, the specimenhere is a whole structure which is a single layer, bidirectional, three-span with 1/3 scale. Moreover, it is a conventional beam with secondary beam structure. The capacity of the structure is verified; the beam and slab crack patterns are illustrated; the load-strain responses are compared; and the contradiction of Strong Column Weak Beam philosophy with the actual failure mode is analyzed. The origin of this inconsistency is mainly attributed to slab monolithically connected to the surrounding beams. So in order to attain a Strong Column Weak Beam yielding sequence, the contribution of slabs can't be neglected. After the comparison, the solid design method is found being superior to the other three design methods. Finally, some suggestions are listed for the beam design work to reach a rational structural failure mode.