Seismic-resistant capacity of multistorey frames with CFT truss girders

摘要

A concrete-filled tubular truss (CFT truss) is a truss composed of parallel chord members made of CFTs. The web members are not necessarily CFTs but steel tubes or shapes, and they are designed to not yield before the chord members. This sort of truss has an excellent deformation capacity, so the CFT chords can be prevented from flexural buckling. The objective of this study was to discuss a new seismic-resistant type of multistorey frame using CFT truss girders, where the trusses are expected to work as full web girders to dissipate seismic energy even in long-spanned frames. The effectiveness of this frame type was demonstrated by a dynamic response analysis in comparison with a frame with vacant tubular truss girders.