Zhibin Wang,Chenhao Ye,Chunguang Zhao,Deshan Li,Jiting Lin
Abstract
Owing to their exceptional durability and lower total life-cycle cost, reinforced sea-sand concrete-filled (circular) stainless steel tubular (RSCFSST) columns offer a highly viable structural solution for coastal regions. To investigate the effects of stirrup spacing and concrete type on the axial compression properties of circular RSCFSST columns, eight axial compression tests were conducted on three types of specimens: circular RSCFSST short columns, reinforced normal concrete-filled stainless steel tubular counterparts, and sea-sand concrete-filled stainless steel tubular (SCFSST) counterparts. The test results indicated that the use of sea-sand concrete has minimal influence on the axial compression behavior of the circular RSCFSST column. Furthermore, the circular RSCFSST columns exhibited superior compression resistance and ductility compared to their SCFSST counterparts. Subsequently, a finite element (FE) model of the circular RSCFSST column was developed to perform mechanism and parametric analyses. Mechanism analysis highlighted that the confinement provided by stainless steel stirrups significantly enhances both the bearing capacity and ductility of core concrete. The parametric analysis further indicated that their axial compression resistance increases with increasing concrete compressive strength, steel yield strength, steel tubular ratio, or volumetric stirrup ratio. Based on these findings, new simplified models to forecast the axial compression resistance, axial compression stiffness, and peak strains of circular RSCFSST columns were suggested.
Key Words
axial compression resistance; axial compression stiffness; finite element model; peak strain; reinforced sea sand concrete-filled circular stainless steel tubular short columns; simplified model
Address
Zhibin Wang — College of Civil Engineering, Fuzhou University, Fuzhou, Fujian Province 350108, China
Chenhao Ye — College of Civil Engineering, Fuzhou University, Fuzhou, Fujian Province 350108, China
Chunguang Zhao — The First Company of China Eighth Engineering Bureau Ltd, Jinan, Shandong Province 250100, China
Deshan Li — School of Civil Engineering, Guangdong Construction Polytechnic, Qingyuan, Guangdong Province 511500, China
Jiting Lin — College of Civil Engineering, Fuzhou University, Fuzhou, Fujian Province 350108, China
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