Journal:Structures

Key Words:The use of seawater sea-sand concrete (SSC) inside plastic-lined steel tubes (PLST) provides a viable solution to the shortage of freshwater and river sand, contributing to cost reduction and sustainable resource utilization. This study presents a comprehensive investigation into the axial compressive behavior and constitutive relationship of SSC confined by PLST, combining experimental research and theoretical analysis. Axial compression tests were conducted on 24 stub columns, with concrete strength and plastic layer thickness as the primary test parameters. The results indicate that the steel tube and the plastic layer exhibit effective composite action, and the columns demonstrate favorable load-carrying capacity and ductility. The ultimate load-carrying capacity of the PLST-confined specimens is over 91% that of the unlined counterparts, and all specimens sustain axial deformation exceeding 8% of the column height without catastrophic failure. Variation in the plastic layer thickness has a marginal effect on the load-carrying capacity, yet the layer can effectively transfer the confinement provided by the steel tube to the concrete core and isolate corrosive media without compromising structural integrity. The effects of the test parameters on failure modes, load-deformation response, load-carrying capacity, and strain development are systematically analyzed. The suitability of available design-oriented models for predicting the stress-strain relationship of the core concrete is evaluated. A modified stress-strain model tailored for PLST-confined SSC is proposed and validated against the experimental results.

Indexed by:Journal paper

Page Number:2026,92:112811

Translation or Not:no

Included Journals:SCI

First Author:苗伟

Co-author:何美芳,姜航,刘阳

Correspondence Author:叶勇