This paper deals with experimental investigations into in-plane stability of fixed concrete-filled steel tubular (CFST) parabolic arches. Three CFST arches with the same span but different rise-to-span ratios were tested under five-point symmetrical concentrated loads over the full span. All applied loads were controlled in synchronization. The test results show that the test arches buckled in an antisymmetric failure mode and the section positions with the maximum deformation were slightly different for three test arches. It is found that the bearing capacity of CFST arches decreased significantly with the decline of rise-to-span ratios, and the outer steel tube provided significant confinement effects on the core concrete after the load reaches 80% of the load-carrying capacity. Moreover, comparisons between the test and finite element results indicate that the existing beam-element modeling method can predict the in-plane stability performance of CFST arches very well.

本文对固定式钢管混凝土抛物线拱的面内稳定性进行了实验研究。在整个跨度上在五点对称集中荷载下测试了三个跨度相同但跨度比不同的CFST拱。同步控制所有施加的负载。测试结果表明，三个拱形测试拱以反对称破坏模式弯曲，最大变形截面位置略有不同。研究发现，随着跨径比的减小，钢管混凝土拱的承载力显着下降，当荷载达到承载能力的80％时，外钢管对核心混凝土产生了明显的约束作用。此外，