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

WEI Jian-gang; XIE Zhi-tao; YANG Yan; WU Qing-xiong; CHEN Bao-chun; PING Jian-chun

doi:10.19818/j.cnki.1671-1637.2022.01.004

Volume 22 Issue 1

Feb. 2022

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WEI Jian-gang, XIE Zhi-tao, YANG Yan, WU Qing-xiong, CHEN Bao-chun, PING Jian-chun. Experiment on out-of-plan mechanical behavior of CFST X-type arches[J]. Journal of Traffic and Transportation Engineering, 2022, 22(1): 58-69. doi: 10.19818/j.cnki.1671-1637.2022.01.004

Citation:

WEI Jian-gang, XIE Zhi-tao, YANG Yan, WU Qing-xiong, CHEN Bao-chun, PING Jian-chun. Experiment on out-of-plan mechanical behavior of CFST X-type arches[J]. Journal of Traffic and Transportation Engineering, 2022, 22(1): 58-69. doi: 10.19818/j.cnki.1671-1637.2022.01.004

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

doi: 10.19818/j.cnki.1671-1637.2022.01.004

WEI Jian-gang^{1, 2, 3
,},
XIE Zhi-tao¹,
YANG Yan^{1, 3
,
,},
WU Qing-xiong^{1, 3},
CHEN Bao-chun^{1, 3},
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 on Multi-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

Funds:

National Natural Science Foundation of China 51878172

More Information

Author Bio:
WEI Jian-gang(1971-), male, professor, PhD, weijg@fzu.edu.cn

YANG Yan(1979-), female, associate professor, PhD, yangyan@fzu.edu.cn
Received Date: 2021-10-01
Publish Date: 2022-02-25

Abstract

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.
- bridge engineering,
- CFST,
- X-type arch,
- out-of-plan,
- experiment,
- non-conservative force,
- hanger

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References(32)

References

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

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