Lin-Hai Han
Tsinghua University
China
Title: Performance and Design of concrete-filled steel tubular (CFST) chord to hollow tubular brace truss
Biography
Biography: Lin-Hai Han
Abstract
Concrete filled steel tubular (CFST) chord to hollow tubular brace truss (referred to as CFST truss for short) is a type of truss which uses CFST members as its chords and hollow tubes as its braces. A concrete slab can be provided on the CFST truss to form a hybrid CFST truss. The new type of trusses can be used in bridge structures and other large span structures. This paper thus presents a preliminary study on the performance and design of such CFST trusses. A finite element analysis (FEA) modeling of CFST trusses subjected to flexural loading was developed and verified against reported experimental data, the predicted performances showed generally good agreement with the test results. The FEA modeling was then used to carry out analysis on the typical failure modes and full-range load-deformation relation of CFST truss subjected to flexural loading. The stress distribution and load-transfer mechanism was also analyzed. Based on this, together with the previous relevant investigations of the authors', the design methodologies for critical issues of practical CFST trusses were presented, including the design formulae for local bearing condition at the connection area, typical joints in truss structures, as well as CFST trusses with or without RC slabs.