Compression Performance of Asymmetric Cross-Section Columns Intended for Use in Modular Structures

This study aimed at developing desirable column cross-sections that are part of mid- and high-rise steel-precast concrete hybrid module buildings. Column cross-sections comprising existing modular frames are mostly steel hollow structural sections. These closed column cross-sections make the assembly process more difficult, leading to reduced constructability, and are costly because of the necessity for fireproofing treatment. In the present study, to overcome these limitations, an asymmetric open cross-section was produced by bending a steel plate, and part of it was filled with concrete. For the evaluation of the structural performance of the developed design, a total of nine specimens of asymmetric open cross-sections were experimented. The test variables were the length of the columns and eccentricity of the load. It was found that the strength decreased as the length of the column increased, and the eccentricity decreased the strength by about 45% compared to the case of central load.