Experimental and Numerical Study of Bonding Capacity of Interface between Ultra-High Performance Concrete and Steel Tube

Ruikun Xu¹, Jiu Li¹, Wenjie Li¹, Wei Zhang^2,*
1 China Communications Third Highway Engineering Bureau Co., Ltd., Fuzhou, 350300, China
2 College of Civil Engineering, Fujian University of Technology, Fuzhou, 350118, China
* Corresponding Author: Wei Zhang. Email: email

Structural Durability & Health Monitoring https://doi.org/10.32604/sdhm.2024.057513

Received 19 August 2024; Accepted 10 October 2024; Published online 05 November 2024

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Abstract

This study investigates the bond performance at the interfacial region shared by Ultra-High Performance Concrete (UHPC) and steel tubes through push-out tests. This study examines how changes in steel fiber volumetric ratio and thickness of steel tube influence the bond strength characteristics. The results show that as the enhancement of the steel tube wall thickness, the ultimate bond strength at the interface improves significantly, whereas the initial bond strength exhibits only slight variations. The influence of steel fiber volumetric ratio presents a nonlinear trend, with initial bond strength decreasing at low fiber content and increasing significantly as fiber content rises. Additionally, finite element (FE) simulations were applied to replicate the experimental conditions, and the outcomes showed strong correlation with the experimental data, confirming the exactitude of the FE model in predicting the bond behavior at the UHPC-Steel interface. These findings provide valuable insights for optimizing the design of UHPC-Filled steel tubes in high-performance structure.

Keywords

Ultra-high performance concrete filled steel tube (UHPCFST); push-out test; bonding capacity; cohesive zone model

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Experimental and Numerical Study of Bonding Capacity of Interface between Ultra-High Performance Concrete and Steel Tube

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