Abstract
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 (fcu), 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.
Highlights
Glass Fiber Reinforced Polymer (GFRP) has been widely used in acidic, alkaline and wet environments because of its advantages of light weight, high tensile strength and good corrosion resistance (Dilum et al, 2018; Ji et al, 2021a)
The partial pressure (N)-deformation (Δ) characteristic curve of hollow GFRP pipe-concrete-high strength steel tube composite long column subjected to eccentric compression is shown in segment)
4) Based on the empirical coefficient method, the calculation formula of the eccentric compression bearing capacity of hollow GFRP pipe-concrete-high strength steel tube composite long columns can be obtained by statistical regression
Summary
Glass Fiber Reinforced Polymer (GFRP) has been widely used in acidic, alkaline and wet environments because of its advantages of light weight, high tensile strength and good corrosion resistance (Dilum et al, 2018; Ji et al, 2021a). Based on the finite element software ABAQUS, finite element model of the hollow GFRP pipe-concrete-high strength steel tube composite column is established.
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