Park Keum-Sung, Lee Sang-Sup, Bae Kyu-Woong, Moon Jiho
Advanced Building Research Division, Korea Institute of Construction Technology (KICT), Goyang-si 10223, Gyeonggi-do, Korea.
Department of Civil Engineering, Kangwon National University, Chuncheon-si 24341, Gangwon-do, Korea.
Materials (Basel). 2022 Sep 1;15(17):6045. doi: 10.3390/ma15176045.
Modular structural systems have been used increasingly for low- and mid-rise structures such as schools and apartment buildings, and applications are extending to high-rise buildings. To provide sufficient resistance and economical construction of the high-rise modular structural system, the steel-concrete composite unit modular structure was proposed. The proposed composite unit modular system consists of the composite beam and the partially encased nonsymmetrical composite column. The outside steel member of the composite column has an open section, and is manufactured using a pressed forming procedure so that easy joining connecting work and manufacturing cost reductions are possible. However, the design methods are complicated due to the inherent nonsymmetrical properties of the section. Therefore, in this study, the focus was made on the strength evaluation and development of design methods for the partially encased nonsymmetrical steel-concrete composite column. Four full-scale specimens were constructed and tested. The experimental study focused on the effect of the slenderness ratio of the column, eccentricity, and the through bars on the strength of such columns. Additionally, the - interaction curve to estimate the strength of the proposed composite column under general combined loading was developed based on the plastic stress distribution method. The results indicate that the through bars are needed to delay the local buckling and distribute the loading uniformly throughout the composite column. Finally, the proposed design methods provide a conservative strength prediction of the proposed composite column.
模块化结构体系已越来越多地用于学校和公寓楼等中低层建筑，并且其应用正在扩展到高层建筑。为了使高层模块化结构体系具有足够的抗力并实现经济建造，提出了钢 - 混凝土组合单元模块化结构。所提出的组合单元模块化体系由组合梁和部分包裹的非对称组合柱组成。组合柱的外部钢构件具有开口截面，采用冲压成型工艺制造，以便于连接工作并降低制造成本。然而，由于截面固有的非对称特性，设计方法较为复杂。因此，在本研究中，重点是对部分包裹的非对称钢 - 混凝土组合柱进行强度评估并开发设计方法。制作并测试了四个足尺试件。试验研究集中于柱的长细比、偏心距和贯通筋对这种柱强度的影响。此外，基于塑性应力分布方法，开发了用于估计所提出的组合柱在一般组合荷载作用下强度的 - 相互作用曲线。结果表明，需要贯通筋来延迟局部屈曲并使荷载在整个组合柱中均匀分布。最后，所提出的设计方法对所提出的组合柱的强度预测较为保守。
