Long-term lateral-torsional buckling behavior of pin-ended CFST arches under uniform radial loads and temperature field

Abstract

In this paper, analytical solutions of the long-term lateral-torsional buckling behavior for the concrete filled steel tubular (CFST) arch with pin ends subjected to uniform radial loads and temperature field are presented. First, an accurate pre-buckling analysis considering both the temperature effect and the creep of concrete is proposed to obtain the time-dependent internal forces of the CFST arch. Then, based on the principle of stationary potential energy and the Rayleigh-Ritz method, the analytical solutions corresponding to the elastic lateral torsional buckling load of the arch and the time-dependent internal force are derived. The variation of buckling load of a CFST arch with time and temperature under uniform radial load and temperature field is analyzed. Good agreements are founded between the analytical solutions and the finite element analysis results, and both of them show that the buckling load of CFST arch subjected to uniform radial load and temperature field decreases significantly as the time and temperature increase. These results are useful for guiding a safer design of CFST arches.