Seismic behavior and strength capacity of steel tube-reinforced concrete composite columns

2013 ◽  
Vol 43 (4) ◽  
pp. 487-505 ◽  
Author(s):  
Xiaodong Ji ◽  
Hongzhen Kang ◽  
Xingchen Chen ◽  
Jiaru Qian
Keyword(s):  
Reinforced Concrete ◽  
Seismic Behavior ◽  
Steel Tube ◽  
Composite Columns ◽  
Strength Capacity

Seismic behavior of steel tube confined reinforced concrete double-column bridge bents

2020 ◽  
Vol 166 ◽  
pp. 105919
Author(s):  
Haicui Wang ◽  
Xuhong Zhou ◽  
Jiepeng Liu ◽  
Xuanding Wang ◽  
Y. Frank Chen
Keyword(s):  
Reinforced Concrete ◽  
Seismic Behavior ◽  
Steel Tube ◽  
Bridge Bents

Influence of Load Condition on Flexural Properties and Shear Properties of Steel Tubular Columns Filled with Steel-Reinforced Concrete

2014 ◽  
Vol 638-640 ◽  
pp. 127-131 ◽  
Author(s):  
Ping Guan ◽  
Lan Xiang Chen
Keyword(s):  
Mechanical Properties ◽  
Reinforced Concrete ◽  
Pipe Steel ◽  
Great Influence ◽  
Compressive Load ◽  
Load Condition ◽  
Steel Tube ◽  
Composite Columns ◽  
Steel Reinforced Concrete ◽  
Tubular Columns

In order to exert the force performance of steel tubular columns filled with steel-reinforced concrete, the focus of the paper is about the influence of load condition on flexural mechanical properties and the shear mechanical properties of the composite columns. The two types of loading conditions are: 1.Steel pipe, steel placed in the steel tube and concrete subject to compressive load simultaneously; 2.Compressive load acts on steel and concrete. The results show that the calculated results based on ADINA and the experimental ones are in agreement well. The calculated results also show that the load condition has no influence on flexural mechanical properties, but has a great influence on shear mechanical properties of the composite columns.

Development and seismic performance of staggered and out-of-plane joints between concrete-filled steel tubular column and reinforced concrete beam

2020 ◽  
Vol 23 (13) ◽  
pp. 2866-2881
Author(s):  
Longji Dang ◽  
Shuting Liang ◽  
Xiaojun Zhu ◽  
Jian Yang ◽  
Yamin Song
Keyword(s):  
Reinforced Concrete ◽  
Shear Deformation ◽  
Seismic Performance ◽  
Seismic Behavior ◽  
Concrete Beam ◽  
Concrete Beams ◽  
Reinforced Concrete Beam ◽  
Steel Tube ◽  
Reinforced Concrete Beams ◽  
Out Of Plane

This article presents a staggered and out-of-plane connection between concrete-filled steel tubular column and reinforced concrete beam (SOC-TCB). SOC-TCB is taken from the basement roof joint of Suning center, which is a height of 341.85 m in China. In this joint system, the H-shaped steel brackets are welded with steel tube to transfer shear and moment. Moreover, the reinforcing bars are interrupted by steel tube and lapped with steel bracket. To investigate the seismic behavior of SOC-TCB, four types of SOC-TCBs were tested under reversal cyclic loading. The differences between specimens were staggered height and out-of-plane angle. Seismic performance was evaluated based on hysteretic behavior, failure mode, shear deformation, rotational deformation, and energy dissipation. The results showed that the shear deformation of joints was extremely small and the plastic hinges were formed at reinforced concrete beams. Due to insufficient anchorage length of longitudinal bars, anchoring failure was found in the reinforced concrete beams. However, SOC-TCB showed better seismic behavior as long as sufficient anchorage of longitudinal bars was ensured.

Effect of cumulative seismic damage to steel tube-reinforced concrete composite columns

2014 ◽  
Vol 7 (2) ◽  
pp. 179-199 ◽  
Author(s):  
Xiaodong Ji ◽  
Mingliang Zhang ◽  
Hongzhen Kang ◽  
Jiaru Qian ◽  
Hongsong Hu
Keyword(s):  
Reinforced Concrete ◽  
Seismic Damage ◽  
Steel Tube ◽  
Composite Columns

Experimental Study on Compressive Bearing Capacity of High Strength Concrete-Filled Steel Tube Composite Columns

2011 ◽  
Vol 368-373 ◽  
pp. 410-414 ◽  
Author(s):  
Hong Zhen Kang ◽  
Lei Yao ◽  
Xi Min Song ◽  
Ying Hua Ye
Keyword(s):  
Compressive Strength ◽  
Reinforced Concrete ◽  
High Strength Concrete ◽  
High Strength ◽  
Steel Tube ◽  
Test Results ◽  
Concrete Filled Steel Tube ◽  
Composite Columns ◽  
Strength Concrete ◽  
Axial Compressive Strength

To study axial compressive strength of high strength concrete-filled steel tube composite columns, tests of 18 specimens were carried out. Parameters of the specimens were the confinement index of concrete-filled steel tube, the cubic strength and the stirrup characteristic value of concrete outer of steel tube. Test results show that the concrete-filled steel tube and the reinforced concrete deformed simultaneously in the axial direction before and at the peak value of axial compressive force; after failure of the reinforced concrete, the concrete-filled steel tube can still bear the axial load and deformation; the main influential factors of axial compressive capacity are confinement index, the cubic strength and the stirrup characteristic value of concrete outer of steel tube. The accuracy of the formula of axial compressive strength of composite columns provided by CECS 188:2005 is proved by the test results of this paper.

scholarly journals Experimental analysis of a mechanical shear connector in concrete filled steel tube column

2017 ◽  
Vol 10 (3) ◽  
pp. 592-625
Author(s):  
J. G. R. NETO ◽  
A. M. SARMANHO
Keyword(s):  
Steel Tube ◽  
Outer Diameter ◽  
Shear Connector ◽  
Hollow Section ◽  
Composite Columns ◽  
Shear Connectors ◽  
Strength Capacity ◽  
Hole Dimension ◽  
Circular Hollow Section ◽  
Bolt Diameter

ABSTRACT This work includes an analytical and experimental study of the structural behavior of shear connectors in composite columns, composed of concrete-filled circular hollow section. For this study was adopted a structural bolt like a shear connector in order to verify the validity of the analytical expressions in ABNT NBR 16239: 2014 [1]. Was carried out a series of push-out tests, fixing the outer diameter of the hollow section and varying the thickness, the bolt diameter, the strength of concrete and the hole dimension. Analysis of the results shows that is possible to use this type of shear connector. The Brazilian prescriptions results are conservative and may be adjusted to provide strength capacity value closest to the experiment.

Experimental Study on Seismic Behavior of Steel-Plate Reinforced Concrete Shear Wall with Rectangular CFST Columns

2012 ◽  
Vol 446-449 ◽  
pp. 370-377
Author(s):  
Jian Wei Zhang ◽  
Wan Lin Cao ◽  
Hong Ying Dong
Keyword(s):  
Reinforced Concrete ◽  
Axial Force ◽  
Seismic Behavior ◽  
Steel Plate ◽  
Shear Wall ◽  
Steel Tube ◽  
Force Ratio ◽  
Hysteretic Characteristics ◽  
Cfst Columns ◽  
Composite Shear

The steel-plate reinforced concrete shear wall with rectangular concrete filled steel tube (CFST) columns is a new kind of composite shear wall. In order to ascertain its seismic behavior and failure mechanism, four 1/5 scale specimens with the same shear span ratio 1.5, different thickness of the steel-plate and different axial force ratio, were tested under horizontal cyclic loading. The thickness of steel-plate in the walls is 2mm, 4mm, 4mm and 6mm, respectively. Based on the experiment, the load-bearing capacity, hysteretic characteristics, ductility, stiffness degradation, energy dissipation capacity and failure mode of the specimens were contrastively analyzed. And the effect of the ratio of height to sectional thickness of steel-plate and the value changes of axial force ratio on seismic behavior of the new shear wall was also analyzed. The result shows that the steel-plate reinforced concrete shear wall with rectangular CFST columns has good seismic performance and important engineering value.

scholarly journals Creep behavior of reinforced concrete-filled steel tubular columns under axial compression

PLoS ONE ◽  
2021 ◽  
Vol 16 (9) ◽  
pp. e0255603
Author(s):  
Ni Zhang ◽  
Chenyang Zheng ◽  
Qingwei Sun
Keyword(s):  
Reinforced Concrete ◽  
Axial Compression ◽  
Stress Level ◽  
Creep Behavior ◽  
Steel Tube ◽  
Reinforcement Ratio ◽  
Concrete Filled Steel Tube ◽  
Composite Columns ◽  
Steel Ratio ◽  
Practical Engineering

The reinforced concrete-filled steel tube (RCFST) column solves several of the problems of the concrete-filled steel tube (CFST) column in practical engineering applications. Moreover, RCFST has a simple joint structure, high bearing capacity, good ductility, and superior fire resistance. From a structural safety perspective, designers prioritize the creep performance of CFST members in structural design. Therefore, the creep behavior of RCFST columns should be thoroughly investigated in practical engineering design. To study the influence of the creep behavior of RCFST columns under axial compression, this work analyzed the mechanical behavior of composite columns based on their mechanical characteristics under axial compression and established a creep formula suitable for RCFST columns under axial compression. A creep analysis program was also developed to obtain the creep strain–time curve, and its correctness was verified by existing tests. On this basis, the effects of the main design parameters, such as the stress level, steel ratio, and reinforcement ratio, on the creep behavior were determined and analyzed. The creep of the tested composite columns increased rapidly in the early stages (28 days) of load action; the growth rate was relatively low after 28 days and tended to stabilize after approximately six months. The stress level had the greatest influence on the creep of RCFST columns under axial compression, followed by the steel ratio. The influence of the reinforcement ratio on the creep behavior was less. The results of this study can provide a reference for engineering practice.

Experimental Study on Reinforced Concrete Beam and Composite Column Joint with Square Steel Cage

2014 ◽  
Vol 622 ◽  
pp. 81-88 ◽  
Author(s):  
Ponsubbiah S. Aravind Raj ◽  
Philip Saratha Joanna
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beam ◽  
Reinforced Concrete Beam ◽  
Steel Tube ◽  
Hole Drilling ◽  
Strength Capacity ◽  
Connection System ◽  
Lateral Strength ◽  
Tube Filling ◽  
Column Joint

For the optimum performance of the structural members, the joint of the beam and column has a significant role. This paper presents the behavior of encased steel column and reinforced concrete beam with an improved connection system. In this connection, the steel tube which interrupts the longitudinal reinforcement in the beam is made continuous in the joint zone. This is done by providing square steel cage inside the concrete casing at the joint. This system is easier for casting and tube filling when compared to the conventional method of in-situ welding and hole-drilling. Experiments were conducted on eight specimens with two specimens in each series which included four control specimens. Number of tiers and the number of concentric rings were the variables among the specimens. The specimens were tested under a constant axial load and reversed lateral loading. Experimental results indicate a significant increase in the lateral strength capacity and ductility ratio of the beam-column when the joint is provided with the square steel cage inside the concrete casing.

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