The concrete-filled double skin steel tubular (CFDST) structure
is a new type of steel-concrete composite structure. It inherits the
advantages of conventional concrete-filled steel tubular (CFST)
structures, including high strength, good ductility and durability, high fire resistance and favorable constructability. Moreover,
because of its unique sectional configuration, the CFDST structure
has been proved to possess higher bending stiffness and better cyclic
performance than conventional CFST structures. In addition, the
use of CFDST structures could lead to lighter self-weight with less
concrete consumption and a reduction of the foundation cost.
This design guide is based on the limit state design philosophy and
is fully compliant with all the current Eurocodes. It covers the selection of materials, design of the CFDST structures, design of joints,
fire protection requirements and practical construction issues. It will
be a valuable guide for practicing engineers who are interested in
the design of CFDST structures. Following the principle of sustainable development, the publication of this design guide is expected to
exert positive effects on the application of CFDST structures.
Finally, the authors would like to thank and acknowledge the contributions from Mr. You-Xing Hua, Dr. Chao Hou, Dr. Wei Li, Dr. Kan
Zhou and Dr. Therese Sheehan in preparation of this design guide.
This is the first design guide on concrete filled double skin steel tubular (CFDST) structures. It addresses in particular CFDST structures with plain concrete sandwiched between circular hollow sections, and provides the relevant calculation methods and construction provisions for CFDST structures.
These inherit the advantages of conventional concrete-filled steel tubular (CFST) structures, including high strength, good ductility and durability, high fire resistance and favourable constructability. Moreover, because of their unique sectional configuration, CFDST structures have been proved to possess lighter weight, higher bending stiffness and better cyclic performance than conventional CFST. Consequently CFDST can offer reduced concrete consumption and construction costs.
This design guide is for engineers designing electrical grid infrastructures, wind power towers, bridge piers and other structures requiring light self-weight, high bending stiffness and high bearing capacity.
