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Analysis and optimization on crashworthiness of ECC plate-thin walled steel pipe composite protective facility(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2023年4期
Page:
40-49
Research Field:
桥梁与隧道工程
Publishing date:

Info

Title:
Analysis and optimization on crashworthiness of ECC plate-thin walled steel pipe composite protective facility
Author(s):
ZHANG Jing-feng1;  JI Hao-hao1;  FENG Liang1;  KONG Ling-yun1; 2;  YANG Dong3
(1. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China; 2. Zhengzhou Municipal Engineering Survey Design & Research Institute, Zhengzhou 450018, Henan, China; 3. CCIC West Testing Co. Led., Xi'an 710032, Shaanxi, China)
Keywords:
bridge engineering;  over-height vehicle;  hollow slab bridge;  composite protective facility;  crashworthiness;  parametric analysis
PACS:
U447
DOI:
10.19721/j.cnki.1671-8879.2023.04.005
Abstract:
In order to reduce the damage of bridge superstructure under over-height vehicle collision, an ECC plate-thin walled steel pipe composite protective facility was proposed. The protective facility was comprised of threemodules, the diffusion module, energy absorption module, and fixing module. The diffusion module, consisting ofECC plate and reinforcement mesh, directly withstood impact from over-height vehicle. The energy absorptionmodule, made up of thin-walled steel pipe filled with polyurethane foam, stored the kinetic energy of the vehicleby deforming itself. The fixing module, constructed from steel plates, provided a reliable connection between theprotective facility and the main beam. The refined finite element model of the protective device was established,with a focus on the elastic-plastic damage of the concrete and ECC materials, as well as the nonlinear contactrelationship between the protective facility and the bridge. The explicit dynamic analysis software Ls-Dyna wasutilized to conduct an in-depth analysis of its crashworthiness performance. The parameters sensitivity of theprotective device was discussed. A standard two-axle truck impacting with the superstructure of prestressedconcrete hollow slab bridge was taken as research example. In a typical analysis case, the vehicle speed is 80 km/h,vehicle weight is 25 t and the over height of impact is 250 mm. The results show that the prestressedconcrete hollow slab bridge mainly presents localized damage that is concrete spalling and reinforcement fractureunder impact. The ECC plate in the composite protective facility can effectively disperse the impact load andprotect the bridge structure. The filled polyurethane foam in the steel pipe and thickening the ECC plate canreduce the deformation of composite protective facility. Increasing the pipe height will increase the energyabsorption effect of protective facility. From the perspective of engineering practical application, the designparameters should be determined comprehensively from the aspects of energy absorption and impact resistance ofthe composite protective facility to ensure its protective effect.3 tabs, 12 figs, 22 refs.

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Last Update: 2023-08-20