scholarly journals Experimental behaviour of very high-strength concrete-encased steel composite column subjected to axial compression and end moment

2018 ◽  
Author(s):  
Zhenyu Huang ◽  
Xinxiong Huang ◽  
Weiwen Li ◽  
Yingwu Zhou ◽  
Lili Sui ◽  
...  
Keyword(s):  
High Strength Concrete ◽  
High Strength ◽  
Compression Tests ◽  
Plastic Design ◽  
Composite Column ◽  
Composite Columns ◽  
Strength Concrete ◽  
Steel Composite ◽  
Compressive Resistance ◽  
Very High

A type of cost-effective and very high strength concrete (VHSC) with 28-day compressive strength of 100-150 MPa is developed for applications in concrete-encased steel composite column constructions. This paper experimentally investigates the structural behaviour of VHSC encased steel composite columns based on a series of pure compression and eccentric compression tests. It is found that such high-strength composite column exhibits brittle post peak behaviour and low ductility but with acceptable compressive resistance. Throughout the tests, the main failure of VHSC encased column under compressive load is brittle spalling of concrete followed by local buckling of the reinforcement bars. The splitting and slippage may occur between concrete and steel section due to bending downward action. The confinement effect by the shear stirrups designed based on normal reinforced concrete codes may not be sufficient. Composite column subjected to initial flexural cracking due to end moment load with large eccentricity may experience degradation in the stiffness and ultimate resistance so that plastic design resistance may not be achieved. Analytical studies show that the N-M interaction model based on current design codes may over-predict the combined resistance of the composite columns. Therefore, a modified elastic-plastic design approach based on strain compatibility is developed to evaluate the compressive resistance of concrete encased composite columns. The validation against the test data shows a reasonable and conservative estimation on the combined resistance of VHSC encased composite columns. 

Assessment of high-strength concrete encased steel composite columns subject to axial compression

2020 ◽  
Vol 164 ◽  
pp. 105765 ◽  
Author(s):  
Binglin Lai ◽  
J.Y. Richard Liew ◽  
Akshay Venkateshwaran ◽  
Shan Li ◽  
Mingxiang Xiong
Keyword(s):  
Axial Compression ◽  
High Strength Concrete ◽  
High Strength ◽  
Composite Columns ◽  
Strength Concrete ◽  
Steel Composite

Loading Process Simulation of GFRP Tube Filled with Steel-Reinforced High-Strength Concrete Columns Subjected to Eccentric Compression

2011 ◽  
Vol 71-78 ◽  
pp. 4203-4206
Author(s):  
Le Zhou ◽  
Hong Tao Liu
Keyword(s):  
High Strength Concrete ◽  
Slenderness Ratio ◽  
Concrete Strength ◽  
High Strength ◽  
Concrete Columns ◽  
Composite Columns ◽  
Strength Concrete ◽  
Finite Strip Method ◽  
Eccentric Compression ◽  
High Strength Concrete Columns

For the further study of bearing compressive capacity of GFRP tube filled with SHC（steel-reinforced high-strength concrete）columns subjected to eccentric compression, and analysis its whole bearing compressive process under eccentric compression. Based on the flat section assumption finite strip method, the calculating program of bearing eccentric compressive capacity of GFRP tube filled with SHC columns is proposed according to existing retrofit theory and related technical procedures. The relation curves of load-deformation is gotten using this calculating program, at the same time it can get the effect curves of concrete strength, slenderness ratio, eccentricity and containing bone rate to load-deformation. Calculations show that the ultimate bearing compressive capacity of composite column decreases with the increase of slenderness ratio, and elastic stage of component curve gradually shortens and stiffness gradually loses; The ultimate bearing compressive capacity of composite columns decreases with the increase of eccentricity; component ductility improves; the ultimate bearing compressive capacity of composite columns increases with the increase of concrete strength. The calculated results agree well with the experimental results and this study provides a basis for practical design.

Experimental study on the seismic performance of composite columns with an ultra-high-strength concrete-filled steel tube core

2019 ◽  
Vol 23 (4) ◽  
pp. 794-809
Author(s):  
Yong Yang ◽  
Xing Du ◽  
Yunlong Yu ◽  
Yongpu Pan
Keyword(s):  
Energy Dissipation ◽  
Seismic Performance ◽  
High Strength Concrete ◽  
High Strength ◽  
Steel Tube ◽  
Load Bearing Capacity ◽  
Concrete Filled Steel Tube ◽  
Composite Columns ◽  
Strength Concrete ◽  
Steel Strips

The ultra-high-strength concrete-encased concrete-filled steel tube column consists of a concrete-filled steel tube core and a rectangle-shaped reinforced concrete encasement. This article presents the seismic performance analysis of ultra-high-strength concrete-encased concrete-filled steel tube columns subjected to cyclic loading. Based on the measured load-lateral displacement hysteresis curves of six ultra-high-strength concrete-encased concrete-filled steel tube columns and two conventional RC columns, the seismic behaviours, such as the ductility, energy dissipation, stiffness and load-bearing capacity, were analysed. The effects of the arrangement of the stirrups and the layout of the prestressed steel strips on the seismic performance of the composite columns were critically examined. The test results indicated that the ductility and energy dissipation performance of the ultra-high-strength concrete-encased concrete-filled steel tube columns were increased by 74.8% and 162.7%, respectively, compared with the conventional columns. The configuration of the prestressed steel strip increased the ductility of the composite column by 28.9%–63% and increased the energy consumption performance by 160.2%–263.3%. By reducing the stirrup spacing and using prestressed steel strips, the concrete-filled steel tube core columns could be effectively confined, leading to a great enhancement in ductility, energy dissipation, stiffness and load-bearing capacity.

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