FINITE ELEMENT ANALYSIS AND MECHANICAL BEHAVIOR OF LATTICE STEEL REINFORCED CONCRETE MIDDLE FRAME WITH SPECIAL-SHAPED COLUMNS

Based on previous experimental studies, 3-D finite element models were used to analyze the behavior of the lattice steel reinforced concrete middle frame with special-shaped columns subjected to monotonous load. The load-displacement skeleton curves of the structure were calculated and analyzed. The final deformations of the structure and joints were also analyzed. It is shown that the finite element analysis results are in good agreement with those of the experiments, which verified the finite element models built in this paper. The strain distribution and development of concretes and steels at typical sections of the structure were analyzed. The conclusion provides valuable references for the design and engineering application of this kind of structure.