Brief Introduction of "Technical Specification of Hollow Concrete Filled Steel Tubular Structures " CECS 254:2009
This paper briefly introduces the background of drawing up "Hollow Concrete Filled Steel Tubular Structures (HCFST) design code",the character of HCFST and current existing design codes in China. In recent years,various cross sections of members are adopted,including circular,polygonal,square and rectangular. So the current code "Technical code on the centrifugal concrete filled thin wall steel tubular structures (DL/T 5030 1996)" cannot satisfy the practice request and the new code should be drawn up. The paper then introduces the main content of "Technical Specification of Hollow Concrete Filled Steel Tubular Structures (HCFST)" CECS 254:2009,which uses the unified design formulations based on "the Unified Theory of CFST" in order to meet the various cross sections of members. The calculation of axial compression,tension,torsion,bending and complex stress state of HCFST members is also introduced along with the design of common connection and processing/manufacturing. Finally some design examples are presented for reference.