|Table of Contents|

Effect of hollow ratio on impact performance of concrete-filled double-skin steel tubular(PDF)

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

Issue:
2025年6期
Page:
58-73
Research Field:
桥梁智能运维与防灾减灾
Publishing date:

Info

Title:
Effect of hollow ratio on impact performance of concrete-filled double-skin steel tubular
Author(s):
LIU Biao1;  WANG Qiu-wei1; 2
(1. College of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, Shaanxi, China; 2. Key Lab of Structural Engineering and Earthquake Resistance, Ministry of Education,Xi'an University of Architecture and Technology, Xi'an 710055, Shaanxi, China)
Keywords:
bridge engineering;  CFDST;  calculation of deformation;  impact performance;  hollow ratio
PACS:
U441
DOI:
-
Abstract:
To study the effect of hollow ratio on the impact performance of concrete-filled double-skin steel tubular(CFDST)under lateral impacts, ABAQUS was used to establish a transverse impact model of CFDST members under considering the hollow ratio. The accuracy of the finite element model was verified by impact tests of existing hollow sandwich CFDST and concrete-filled steel tube specimens. Based on accurate numerical simulation, the damage modes and force mechanisms at each impact stage of the CFDST specimens, force-time curves, deformations and energy absorptions of CFDSTs with different hollow ratios were investigated. A calculation model for the overall mid-span deformation of CFDST members with embedded circular steel tubes was proposed. The results show that the overall mid-span deformation of CFDST specimens decreases with the increase of hollow rate, while the local deformation increases. With the increase of hollow ratio from 0 to 75%, the overall deformation reduces about 20%. The impact plateau reaches the maximum value when the hollow ratio is 25%. The energy dissipation performance of CFDST is significantly affected by the hollow ratio, specimens with large hollow ratio have greater energy consumption capacity. The stability of CFDST specimens decreases by approximately 10% with the increase of hollow rate, while the energy absorption coefficient can increase by up to 32.4%. The overall mid-span deformation of CFDST specimens is significantly smaller than the concrete-filled steel tube, and the impact resistance ofCFDST specimens with built-in circular steel tube is obviously better thanCFDST specimens with built-in square steel tube. The calculation formulaof CFDST specimens with built-in circular steel tube mid-span deformation based on the rigid-plastic model and moving hinge theory can accurately calculate the mid-span deformation of CFDST under the impact, and the relative error of the calculation is within 15%. The proposed calculation formula provides a theoretical basis for the design of such structures in engineering applications.3 tabs, 19 figs, 26 refs.

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Last Update: 2025-12-20