Geometric Nonlinearity and Long-Term Behavior of Crown-Pinned CFST Arches

AbstractConcrete-filled steel tubular (CFST) arches are often used in engineering structures, particularly in bridge construction. In some instances, to expedite their construction and transport, curvilinear steel tube segments are fabricated and delivered to the construction site and then joined together at the crown to create a pin, so the arch becomes a crown-pinned arch. Wet concrete is then pumped into the steel tubes to form the concrete core after curing, which experiences time-dependent shrinkage and creep. This paper investigates the effects of geometric nonlinearity on the long-term in-plane behavior of crown-pinned circular CFST arches under a sustained central concentrated load, and derives analytical solutions for their nonlinear response and buckling loads. It is found that the geometric nonlinearity influences the long-term behavior of crown-pinned CFST arches significantly. The long-term deformations predicted by the nonlinear analysis are larger than those predicted by linear analysis, an...