In-Plane Stability of Fixed Concrete-Filled Steel Tubular Parabolic Arches under Combined Bending and Compression

作者：Liu, Changyong; Wang, Yuyin^*; Wu, Xinrong; Zhang, Sumei

来源：Journal of Bridge Engineering, 2017, 22(2): 04016116.

DOI：10.1061/(ASCE)BE.1943-5592.0000993

• Concrete-filled steel tube
• Fixed parabolic arch
• Compression and bending
• Stability
• Rise-span ratio

The current codes and specifications use the equivalent beam-column method to predict the in-plane stability capacity of concrete-filled steel tubular (CFST) arches. Using this method, the effects of the rise-span ratio and the nonuniform moment on the stability capacity of CFST parabolic arches are not considered. This may induce a difference between calculation results and actual structural stability capacity. To study the effects of the rise-span ratio and the nonuniform moment, six fixed CFST parabolic arches, with rise-span ratios of 1/4.5, 1/6, and 1/9, were tested and analyzed in this study. The failure patterns and mechanisms were studied. The confining effect of the steel tube to the concrete at failure was investigated. The influence of the rise-span ratio and loading conditions on the in-plane stability of fixed CFST arches was also considered. A nonlinear elastic-plastic finite-element (FE) model was used to predict the buckling behavior of the fixed CFST parabolic arches. Based on the test and the FE results, a design equation is proposed for the design of in-plane stability of fixed CFST parabolic arches under combined bending and compression.

• 出版日期2017-2
• 单位哈尔滨工业大学