Hybrid FRP-reinforced concrete-steel double-skin tubular columns (DSTCs) exhibit the benefits of high bearing capacity, sufficient ductility and excellent durability. However, there are fewer studies on reinforced DSTCs under axial compression compared to unreinforced DSTCs. Eleven circular cross-section columns were tested to study the compressive behavior of GFRP-reinforced concrete-DSTCs. The main parameters considered were the thicknesses of GFRP tubes, longitudinal reinforcement ratio, hollow ratio and concrete strength. The test results showed that reinforced DSTCs had higher bearing capacity and better ductility than traditional DSTCs, and their bearing capacity could be increased by 36%–48%. The bearing capacity and initial stiffness increased with the increase of longitudinal reinforcement ratio, thicknesses of GFRP tubes and concrete strength, while they decreased with the increase of hollow ratio. When the load was within the range of 55%P_u, the restriction of the GFRP tube to the concrete was not obvious. Furthermore, an analytical model was established to predict the full load-strain curves of reinforced DSTCs, which considered the restraining effect of stirrups and the bi-axial stress state of FRP tube. The established model was in good agreement with most of the test results.

混合 FRP-钢筋混凝土-钢双皮管柱 (DSTC) 具有高承载力、足够的延展性和出色的耐久性等优点。然而，与未增强的 DSTC 相比，在轴向压缩下增强 DSTC 的研究较少。测试了 11 个圆形截面柱以研究压缩行为GFRP 钢筋混凝土-DSTCs。主要考虑的参数有玻璃钢管厚度、纵筋率、空心率和混凝土强度。试验结果表明，增强型DSTC比传统DSTC具有更高的承载力和更好的延展性，其承载力可提高36%~48%。承载力和初始刚度随着纵筋比、玻璃钢管厚度和混凝土强度的增加而增加，随着空心率的增加而降低。_{当负载在55%P u}范围内时, GFRP管对混凝土的约束不明显。此外，建立了一个分析模型来预测钢筋 DSTC 的全载荷-应变曲线，该模型考虑了箍筋的约束作用和 FRP 管的双轴应力状态。建立的模型与大部分测试结果吻合良好。