To investigate the bearing capacity of the hollow Glass Fiber Reinforced Polymer (GFRP) pipe-concrete-steel tube composite long columns subjected to eccentrical compression load, 33 hollow GFRP pipe-concrete-steel tube composite long columns have been designed. The slenderness ratio (λ), compressive strength of concrete cube (f_cu), eccentricity (e) and so on are the main parameters. Based on constitutive models for steel, GFRP and confined concrete, numerical simulation of the hollow GFRP pipe-concrete-high strength steel tube composite long columns has been carried out by using software ABAQUS. The rationality of the constitutive models and modeling method has been verified by comparing the experimental and simulated load-displacement curves. The influence of different parameters on the mechanical behavior of this kind of column has been investigated. Results show that with the increasing of t1, t2 and fcu, the ultimate eccentrical compression bearing capacity of the specimen increases. With the increasing of e, the ultimate displacement of the specimens increases, while the ultimate eccentrical compression bearing capacity decreases. The eccentricity has a significant influence on the ultimate eccentrical compression bearing capacity. With the increasing of λ, the ultimate eccentrical compression bearing capacity of the specimens gradually decreases. The specimens suffer from ductile failure. The formula of the ultimate eccentrical compression bearing capacity of the composite columns is obtained by statistical regression. The study can provide theoretical support for the application of the composite columns in practical engineering.

为研究空心玻璃纤维增​​强聚合物（GFRP）管-混凝土-钢管复合长柱在偏压荷载作用下的承载能力，设计了33根中空GFRP管-混凝土-钢管复合长柱。长细比（λ），混凝土立方体的抗压强度（F_铜)、偏心率(e)等是主要参数。基于钢、GFRP和约束混凝土的本构模型，利用ABAQUS软件对空心GFRP管-混凝土-高强钢管组合长柱进行数值模拟。通过比较实验和模拟荷载-位移曲线，验证了本构模型和建模方法的合理性。研究了不同参数对这种柱的力学行为的影响。结果表明，随着t1、t2和fcu的增加，试件的极限偏心压缩承载力增加。随着e的增大，试件的极限位移增大，而极限偏心压缩承载力减小。偏心距对极限偏心受压承载力有显着影响。随着λ的增大，试件的极限偏心压缩承载力逐渐减小。试样发生延性破坏。通过统计回归得到组合柱极限偏心受压承载力计算公式。该研究可为复合柱在实际工程中的应用提供理论支持。通过统计回归得到组合柱极限偏心受压承载力计算公式。该研究可为复合柱在实际工程中的应用提供理论支持。通过统计回归得到组合柱极限偏心受压承载力计算公式。该研究可为复合柱在实际工程中的应用提供理论支持。