FRP-钢管混凝土抛物线拱轴压及压弯承载力研究

In order to investigate the static performance of FRP confined concrete-filled steel tubular (CCFST) arches, finite element (FE) models were established using ABAQUS software and validated against existing test results. Then parametric analysis was conducted to study the influence of parameters such as FRP thickness, steel ratio, slenderness ratio, and rise-to-span ratio on the ultimate strength of CCFST arches under uniformly distributed loads and mid-span concentrated loads. The results show that under uniformly distributed loads, the ultimate strength of CCFST arches increases with the spirally wound FRP thickness, rise-to-span ratio, and steel ratio, while decreases with the increase of FRP-to-steel confining ratio and slenderness ratio. Under mid-span concentrated loads, the ultimate strength increases linearly with the increase of longitudinally wrapped FRP layers. Based on the FE analysis results, a design method determining the ultimate bearing capacity of CCFST arches under axial compression and mid-span concentrated loads was proposed, considering the influence of FRP-to-steel confining ratio, rise-to-span ratio, and slenderness ratio on the bearing capacity of CCFST arches. The calculated results are in good agreement with the finite element analysis results, with a maximum deviation of no more than 20% .