Bearing Capacity of Hollow GFRP Pipe-Concrete-High Strength Steel Tube Composite Long Columns Under Eccentrical Compression Load

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