IN-PLANE CREEP BUCKLING OF PIN-ENDED CONCRETE
CIRCLE ARCHES

The in-plane buckling differential equation of pin-ended circle arches and Arutyunyan-Maslov (AM) creep law are combined, and the creep integral operator and instability condition are introduced to derive the formula for the creep buckling strength of pin-ended concrete circle arches. Based on the formula, the influences of the creep coefficient and steel ratio are discussed via a numerical example. The creep buckling strength of plain concrete (PC) arches, reinforced concrete (RC) arches and concrete-filled steel tubular (CFST) arches are comparatively analyzed. The results show that creep buckling strength decreases with time for different material compositions of arch ribs. The concrete creep has a great effect on the stability of PC arches followed by RC arches and CFST arches. Compared with the existing method, the AM-based formula could reflect the influence of the steel ratio on a creep buckling.