Axial compression tests on seawater and sea sand concrete-filled double-skin stainless steel circular tubes
Axial compression tests on seawater and sea sand concrete-filled double-skin stainless steel circular tubes
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DOI：
10.1016/j.engstruct.2018.09.040
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发表时间：
2018-12
影响因子：
5.5
通讯作者：
Ying‐Lei Li;Xiao Ling Zhao;R. K. Raman;X. Yu
中科院分区：
文献类型：
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作者：
Ying‐Lei Li;Xiao Ling Zhao;R. K. Raman;X. Yu
海水海砂混凝土(SWSSC)双层不锈钢管由两根同心圆形不锈钢管组成，夹在两根不锈钢管之间。本文对SWSSC填充双壁SS管在轴压下的受力性能进行了试验研究。未填充的圆形空心截面试件(CHS)、全填充管(CFST)和无内管的双层皮管(CFHT)也进行了对比试验。研究了荷载-轴向应变曲线、混凝土中的应力、峰后行为和能量吸收。讨论了约束系数、空洞率和管长细比等关键参数对短肢钢管结构性能的影响。结果表明，混凝土的极限应力主要受约束系数的影响，峰后行为既受约束系数的影响，又与内管长细有关。提出了SWSSC填充SS圆管受压承载能力的计算公式。
Seawater and sea sand concrete (SWSSC) filled double-skin stainless steel (SS) tubes consist of two concentric circular SS tubes, sandwiching SWSSC between them. This paper presents an experimental study on SWSSC-filled double-skin SS tubes (CFDSTs) under axial compression. Unfilled circular hollow sectional (CHS) specimens, fully-filled tubes (CFSTs) and double-skin tubes without inner tube (CFHT) were also tested for comparison purpose. Load-axial strain curves, stress in concrete, post-peak behaviour and energy absorption are investigated in this study. The effects of some key parameters, including confinement factor, void ratio and tube slenderness ratio, on the structural behaviour of SWSSC-filled SS tubes are discussed. It is found that the ultimate stress in concrete is mainly affected by confinement factor and the post-peak behaviour depends on both confinement factor and inner tube slenderness. Formulas are proposed to estimate the load carrying capacity of SWSSC-filled SS circular tubes in compression.