Vertical seismic response analysis of long-span composite open-web grid floor

Purpose The purpose of this paper is to study the dynamic characteristics and seismic performance of the composite open-web grid floor structure. Design/methodology/approach Studied by using mode-superposition response spectrum method and time history analysis method. Findings The results show that the vertical mode-superposition response spectrum method is close to the time history analysis method. The floor has strong seismic performance, and the deflection and internal force are not large under vertical seism. The vertical seismic action suggested that 10% of the representative value of gravity load should be used to ensure the safety of the structure. Originality/value In the design, the mid-span section should be properly strengthened or the variable section design should be adopted.