Analytical behaviour of CFST chord to CHS brace truss under flexural loading

作者：Hou, Chao; Han, Lin-Hai^*; Mu, Ting-Min; He, Shan-Hu

来源：Journal of Constructional Steel Research, 2017, 134: 66-79.

DOI：10.1016/j.jcsr.2017.03.008

• Concrete filled steel tubes (CFST)
• Steel tube
• Truss
• Finite element analysis (FEA)
• Analytical behaviour
• Simplified design formulae

Concrete filled steel tubular truss (CFST truss for short) structures composed of CFST members as chords and steel tube members as braces are having expanded utilization in large-scale infrastructure constructions. In bridge structures, a concrete slab is usually provided on top of the CFST truss to form a hybrid CFST truss. Besides previous research work on the experimental performance of CFST and hybrid CFST trusses reported in the companion paper (Han et al., 2015), detailed analytical behaviour of such composite truss systems is needed. This paper thus presents a finite element analysis (FEA) modelling on CFST truss without concrete slab as well as hybrid CFST truss with concrete slab subjected to flexural loading, which is validated through reported test data. The FEA modelling is then used to perform analysis on typical failure modes, moment-deflection relations, stress developments, material interactions and the load transferring paths of the composite truss systems. Influences of important parameters on the flexural performance of the composite truss are also investigated, including chord types, existence of reinforced concrete (RC) slab, strength ratio between chords, cross-section profiles, etc. Finally, simplified methods for calculating the flexural strength of CFST and hybrid CFST trusses are recommended and validated.

• 出版日期2017-7
• 单位清华大学