The Research On Design Method Of Concrete-Filled Rectangular Steel Tube Truss

As a novel kind of structure, The Concrete-Filled Rectangular Steel Tube Truss (CFRSTT) is one of the development and perspective of Steel Confined Concrete (STCC), which are studied in this paper. The theoretical of analysis and numerical simulation calculation are used to analyze the finite element model. The research work of this thesis is aimed at offering convicting evidence for the correlation regulations, moreover, popularizing such structure is expected. The main research works are included as follows: To study the work behavior of CFRSTT with different models, three typical CFRSTT and the correspond Rectangular Hollow Steel Tube Truss (RHSTT) are set up. A set of equation is proposed to calculate the axial force of brace member with different kinds of eccentricity, the different model's effects factor of axial force, bending moment and deflection of CFRSTT are discussed, and the parallel analysis with RHSTT. Base on the reasonable simplified model, the buckling analysis are used to find the effective lengths of compressed chords and braces of CFRSTT, the relation curve between effective lengths with effect factor are provide in this paper. According to the practical engineering application, the reasonable effective lengths of compressed chords and braces are presented. In the end, the static behavior of multiplanar XX-joints are discussed, which used widely in practical engineering. An amount of joints with the variable joint parameters under lode-case are analyzed. Base on research achievement of uniplanar X-joints, a set of formula is proposed to predict the ultimate bearing capacity of multiplanar XX-joints, which are easy to understand in physical concept and simple in practice.