Various patented designs of connection mechanisms have been proposed for the space truss systems such as Triodetic, Nodus, Mero, Okta, “ V”, processing of tube ends by milling and mutual welding, or simply connection and welding by a sheet insertion into the undercut tube ends. However, the insufficient flat surface of circular profile for rivets or bolts placement creates challenging issues in the connection between steel members. The steel members used in truss systems are generally in circular hollow section for their adequate behaviour under both tension and compression. The determination of critical load is essential to assess the reliability and safety of space truss structures. The truss system is mainly composed of long steel members connected to each other at nodes to form the framework structures. Space trusses have been widely used in engineering structures as construction industry imposing increasingly demanding requirements on safety design of light weight structures at low cost. The results also show that the critical load decreases rapidly even at a small value of eccentricity and thus may have a significant effect on the load-carrying capacity. The calculated results are compared and shown in a good agreement with those obtained from the experimental results. In addition, the loading tests were performed on a total of 180 specimens with different diameters, slenderness, and connection.
#Critical combined loading for flexture column series
The critical load is calculated from the differential equation of deflection curve which is solved by the power series and Runge-Kutta method. Three different cases of eccentricities are studied with the drilled holes either on the same side or on the opposite side of column axis. The circular tube has variable cross section at flattened ends with existing holes used for connection between members. The purpose of this paper is to determine a critical load for a nonuniform circular steel tube under eccentrically axial load.
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