|Table of Contents|

Experiment on out-of-plan mechanical behavior of CFST X-type arches(PDF)

《交通运输工程学报》[ISSN:1671-1637/CN:61-1369/U]

Issue:
2022年01期
Page:
58-69
Research Field:
道路与铁道工程
Publishing date:

Info

Title:
Experiment on out-of-plan mechanical behavior of CFST X-type arches
Author(s):
WEI Jian-gang123 XIE Zhi-tao1 YANG Yan13 WU Qing-xiong13 CHEN Bao-chun13 PING Jian-chun4
(1. College of Civil Engineering, Fuzhou University, Fuzhou 350116, Fujian, China; 2. College of Civil Engineering,Fujian University of Technology, Fuzhou 350118, Fujian, China; 3. Fujian Provincial Key Laboratory onMulti-Disasters Prevention and Mitigation in Civil Engineering, Fuzhou University, Fuzhou 350116, Fujian, China; 4. Shaoxing Housing and Urban-Rural Development Supervision and Law Enforcement Team, Shaoxing 312030, Zhejiang, China)
Keywords:
bridge engineering CFST X-type arch out-of-plan experiment non-conservative force hanger
PACS:
U441.4
DOI:
10.19818/j.cnki.1671-1637.2022.01.004
Abstract:
To investigate the effects of non-conservative forces on the out-of-plane stability of concrete filled steel tubular(CFST)X-type arches, the structural spatial mechanical behaviors of CFST X-type arches were analyzed via experiment and finite element analysis. Based on a prototype bridge, the structural spatial mechanical behaviors of a CFST X-type arch with hangers were tested to elucidate the failure mechanisms of the arch model. A finite element model of a standard CFST X-type arche was created based on the experimental data and the actual structural engineering parameters. The conservative and non-conservative forces from hangers were considered respectively in models with or without tie hangers. The effects of arch rib inclination, rise-span ratio, and width-span ratio on the out-of-plane ultimate bearing capacities of CFST X-type arches considering the non-conservative force from hangers or not were analyzed. Based on a finite element model for combined material and geometric nonlinearities and in terms of load and displacement ratios, the improvement in the spatial mechanical behaviors of arch rib due to the non-conservative force was quantitatively analyzed under different parameters. Research results indicate that during the spatial mechanical process, the displacement of the CFST X-type arch is symmetrically distributed about the crown section, and the strain distribution is also highly symmetric. Therefore, the arch model has good overall stability and low sensitivity to initial geometric defects during the spatial mechanical process. The arch model ultimately failed due to an out-of-plane extreme point instability. The arch rib mainly bears compression and out-of-plane bending moment, and the out-of-plane bending moment is the main controlling factor for the stability and ultimate bearing capacity of the arch model. The out-of-plane ultimate bearing capacity of CFST X-type arches initially increases and then decreases with the increasing arch rib inclination, rise-span ratio, and width-span ratio. The arch model reaches its maximum ultimate bearing capacity when the arch rib inclination is 9°, the rise-span ratio is 0.25, and the width-span ratio is 0.03. The non-conservative force should be considered when calculating the out-of-plane ultimate bearing capacity of CFST X-type arches, as the omission of the force will lead to a 22% underestimation of the out-of-plane ultimate bearing capacity. 1 tab, 21 figs, 32 refs.

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Last Update: 2022-03-20