Steel and Composite Structures
Volume 59, Number 3, 2026, pages 335-358
DOI: 10.12989/scs.2026.59.3.335
Slip analytical method of GFRP-concrete-steel composite beams under prestressing loads
Zhaojie Tong , Bingqing Luo , Hailong Zhang , Shuge Zhang
Abstract
Significant interface slip may occur between the slab and steel beam in steel-concrete composite beams under prestressing. Owing to their lower stiffness, GFRP-concrete slabs may induce larger interface slip and higher shear demands on connectors than conventional concrete slabs. This study presents a refined analytical method for predicting the slip behavior of prestressed GFRP-concrete-steel composite beams. Extending conventional sectional analysis, the proposed model explicitly incorporates the influence of the GFRP plate, shear connector stiffness, and shear connector arrangement. To verify the accuracy of the theoretical method, two GFRP-concrete-steel composite beam specimens were fabricated and tested. In parallel, a series of numerical models were developed to further validate the analytical method. Comparisons among experimental, theoretical, and numerical results confirmed the reliability and accuracy of the proposed analytical model. Furthermore, parametric studies are conducted to investigate the effects of key design parameters on slip between composite slabs and steel beams. The results demonstrate that incorporating GFRP plates increases the interface slip, whereas densifying shear connectors near the prestressing load zone effectively reduces slip in the composite beams. The proposed analytical approach provides a practical and accurate tool for analyzing and optimizing the shear connector arrangements of GFRP-concrete-steel composite beams under prestressing loads.
Key Words
composite beam; GFRP-concrete-steel; numerical analysis; prestress; slip
Address
- Zhaojie Tong — College of Engineering, Fujian Jiangxia University, Fuzhou 350108, China
- Bingqing Luo — Department of Mathematics and Physics, Fujian Jiangxia University, Fuzhou 350108, China
- Hailong Zhang — Shenzhen Municipal Design & Research Institute Co., Ltd., Shenzhen 518029, China
- Shuge Zhang — 1)College of Engineering, Fujian Jiangxia University, Fuzhou 350108, China 2)College of Transportation and Civil Engineering, Fujian Agriculture and Forestry University, Fuzhou 350002, China
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