Numerical analysis of corner-supported composite modular buildings under wind actions

This paper proposes a novel design of a corner-supported steel-concrete composite module that is suitable for multi-storey modular buildings. The strength and stiffness of the individual modules are improved through the designs of concrete-filled steel tubular (CFST) columns, laminated double beams, and integrated concrete slabs. The overall structural integrity of the modular buildings is improved through the designs of tenon-connected inter-module connections combined with beam-to-beam bolt connections. Analyses on modules reveal the effects of CFST columns on the failure mode and the lateral resistance of individual modules. Average increases of 21% in elastic stiffness and 33% in capacity under lateral loads are evident. The inter-module connections are proved to be effective in tying the modules together under lateral loads. A simplified FEA model is then developed for simulations of 12-storey modular buildings with various designs, of which the behaviours under wind actions are assessed according to the Australian Standards AS 1170.0–2. The drawbacks of the modular buildings are discussed, and the corresponding design recommendations are proposed.