Crack Pattern and Ductility of Connections Composed of CSSEUHSC Columns and RC Beams Subjected to Reversal Cycle Loads

2010 ◽  
Vol 44-47 ◽  
pp. 3884-3887
Author(s):  
Ju Zhang ◽  
Chang Wang Yan ◽  
Jin Qing Jia
Keyword(s):  
Crack Resistance ◽  
Axial Load ◽  
Engineering Application ◽  
Load Ratio ◽  
High Strength ◽  
Crack Pattern ◽  
Rc Beams ◽  
Axial Load Ratio ◽  
Test Parameters ◽  
Resistance Performance

In order to investigate the crack pattern and ductility of connection composed of cross shaped steel encased ultra high strength concrete (CSSEUHSC) columns and reinforced concrete (RC) beams subjected to reversal cycle load, six interior connection specimens were tested with various axial load ratio and volumetric stirrup ratio. A discussion on the ductility and crack pattern was presented. It was found that cracks appeared in the connection core regions and at the beam end for all specimens, and that axial load ratio had more influence on the crack resistance capacity. The experimental results indicated that test parameters of connection composed of CSSEUHSC columns and RC Beams with good crack resistance performance may be referred for engineering application.

Crack Pattern of SRUHSC Column and SRC Beam Joint Subjected to Reversal Cycle Load

2010 ◽  
Vol 152-153 ◽  
pp. 1125-1128
Author(s):  
Ju Zhang ◽  
Chang Wang Yan ◽  
Jin Qing Jia
Keyword(s):  
Crack Resistance ◽  
Axial Load ◽  
Shear Fracture ◽  
Engineering Application ◽  
Load Ratio ◽  
High Strength ◽  
Crack Pattern ◽  
Steel Reinforced Concrete ◽  
Axial Load Ratio ◽  
Test Parameters

In order to investigate the crack pattern of steel reinforced ultra high strength concrete (SRUHSC) column and steel reinforced concrete (SRC) beam joint subjected to reversal cycle load, six interior joint specimens were tested with various axial load ratio and volumetric stirrup ratio. A discussion on the ductility and crack pattern was presented. It was found that all joint specimens failed in shear fracture in the joint core regions and that axial load ratio had more influence on the crack resistance capacity. The experimental results indicated that test parameters of SRUHSC column and SRC beam joint with good crack resistance performance may be referred for engineering application.

Crack Pattern and Ductility of Connections Composed of CSSEUHSC Columns and SEC Beams under Cycle Loads

2011 ◽  
Vol 50-51 ◽  
pp. 396-399
Author(s):  
Chang Wang Yan ◽  
Ju Zhang ◽  
Jin Qing Jia
Keyword(s):  
Crack Resistance ◽  
High Strength Concrete ◽  
Plastic Hinge ◽  
Engineering Application ◽  
High Strength ◽  
Crack Pattern ◽  
Core Region ◽  
Test Parameters ◽  
Beam Plastic Hinge ◽  
Resistance Performance

In order to investigate the crack pattern and ductility of connection composed of cross shaped steel encased ultra high strength concrete (CSSEUHSC) columns and steel encased concrete (SEC) beams under cycle loads, six interior connection specimens were tested in the laboratory. It was found that cracks appeared in the connection core regions and at the beam end for all specimens, and all the connections behaved in a ductile manner and failed in bending with a beam plastic hinge and shearing in the connection core region. The experimental results indicated that test parameters of connection composed of CSSEUHSC columns and SEC beams with good crack resistance performance may be referred for engineering application.

Crack Resistance of Connections of Cross Shaped Steel Encased Ultra High-Strength Concrete Column to RC Beam under Cycle Loads

2010 ◽  
Vol 150-151 ◽  
pp. 1005-1008
Author(s):  
Chang Wang Yan ◽  
Jin Qing Jia ◽  
Ju Zhang
Keyword(s):  
Crack Resistance ◽  
High Strength Concrete ◽  
Engineering Application ◽  
Load Ratio ◽  
High Strength ◽  
Rc Beam ◽  
Strength Concrete ◽  
Axial Load Ratio ◽  
Resistance Performance ◽  
Good Agreement

In order to investigate the crack resistance capacity of cross shaped steel encased ultra high-strength concrete (CSSEUHSC) column to reinforced concrete (RC) beam connection subjected to reversal cycle load, six interior joint specimens were tested with various axial load ratio nt and volumetric stirrup ratio ρv. A discussion on the crack resistance capacity was presented. Calculation methods of crack resistance capacity were deduced and calculating results were in good agreement with the experimental results. The research results indicated that parameters of CSSEUHSC column to RC beam connection with better crack resistance performance may be referred for engineering application.

Fire Resistance Performance of Welded Built-up Square CFT Columns with Reduced Intumescent Paint

2015 ◽  
Vol 6 (2) ◽  
pp. 103-112
Author(s):  
SunHee Kim ◽  
KyongSoo Yom ◽  
SungMo Choi
Keyword(s):  
Stress Concentration ◽  
Fire Resistance ◽  
Axial Load ◽  
Load Ratio ◽  
Functional Design ◽  
Steel Tubes ◽  
Composite Effect ◽  
Axial Load Ratio ◽  
The Law ◽  
Resistance Performance

Welded built-up square CFT columns are widely employed in construction field thanks to their structural efficiencies by avoiding stress concentration area and improving workability in fabrication and maximizing the composite effect enabled by bent ribs. Although welded built-up square CFT columns have structural advantages over other members and are widely used, they are classified as non-fireproof in Korea because the steel tubes are directly exposed to a fire. Thus, fire coating required for the columns by the law results in inefficient design. This study suggests welded built-up square CFT columns with reduced coating to enable improved fire-resistance performance for 2˜3 hours. The purpose of the study is to analyse their fire-resistance performance using the variable of axial Load ratio which is the major factor in the performance and suggest efficient functional design with reduced coating.

Strength Degeneration of SRUHSC Column to RC Beam Joint Subjected to Reversal Cycle Load

2014 ◽  
Vol 578-579 ◽  
pp. 580-583
Author(s):  
Chang Wang Yan ◽  
Ju Zhang ◽  
Shu Guang Liu ◽  
Yong Yang
Keyword(s):  
Axial Load ◽  
Load Ratio ◽  
Experimental Results ◽  
Scale Model ◽  
Rc Beam ◽  
Loading Test ◽  
High Rise ◽  
Axial Load Ratio ◽  
Test Parameters ◽  
Cycle Loading

In order to investigate the strength degeneration of SRUHSC column to RC beam joint subjected to reversal cycle load, six interior joint specimens were designed basing on half-scale model of prototype joint used in high-rise buildings. A reversal cycle loading test was carried out and test parameters included various axial load ratio and volumetric stirrup ratio. Strength degeneration of SRUHSC column to RC beam joint was described. A discussion on relations between λj and applied axial load ratio or volumetric stirrup ratio was presented. It was found that strength of all the joints degenerated in every displacement and degenerated more quickly with the increment of displacement during the reversal cycle loading, and that the strength of all the joints degenerated fast with the increment of applied axial load ratio and slowly with the increment of volumetric stirrup ratio. The experimental results indicated that test parameters had obvious influence on the strength degeneration of SRUHSC column to RC beam joint subjected to reversal cycle load.

Yield Displacement Calculation Method of High-Strength Concrete Shear Wall

2013 ◽  
Vol 353-356 ◽  
pp. 3382-3386 ◽  
Author(s):  
Hua Jing Zhao ◽  
Xing Wen Liang ◽  
Can Song
Keyword(s):  
Cross Section ◽  
High Strength Concrete ◽  
Axial Load ◽  
Load Ratio ◽  
High Strength ◽  
Shear Wall ◽  
Strength Concrete ◽  
Axial Load Ratio ◽  
Yield Displacement ◽  
Calculation Results

Considering high compressive strength of high-strength concrete, it is assumed that concrete compressive stress of the cross-section compression zone is linear distribution when the cross-section of high-strength concrete shear wall reaches yield situation. Based on the plane section assumption, the yield curvature formula of shear wall section is obtained by using moment - curvature analysis method. The parameters effecting yield curvature of high-strength concrete shear wall are studied by using the yield curvature formula. The results show that longitudinal reinforced yield strain is the most influencing factor of the yield curvature in addition to axial load ratio. This paper presents yield curvature formula considering the impact of axial load ratio and boundary reinforcement yield stress through the regression analysis of calculation results. On this basis, the vertex yield displacement formula of high-strength concrete shear wall is proposed, and the calculation results of formula correspond to the vertex yield displacement experimental values of the 12 high-strength concrete cantilever wall well.

Research on Restoring Force Model of High Strength Concrete-Filled Steel Tubular Columns

2012 ◽  
Vol 166-169 ◽  
pp. 1746-1751
Author(s):  
Kai Ze Ma
Keyword(s):  
High Strength Concrete ◽  
Axial Load ◽  
Slenderness Ratio ◽  
Load Ratio ◽  
High Strength ◽  
Experimental Results ◽  
Force Model ◽  
Restoring Force ◽  
Restoring Force Model ◽  
Axial Load Ratio

Based on the experimental results of twenty three high strength concrete-filled square steel tubular (HCFT) columns subjected to cyclic lateral load, the restoring force model of square HCFT columns is established. Through theoretical analysis and experimental results, the main parameters of the restoring force model which are axial load ratio, confinement effect coefficient as well as slenderness ratio are discussed. The theoretical method is put forward. The results show that the relation of elastic stiffness to degraded stiffness, the relation of ultimate bearing capacity to yielding loads are proportional with confinement effect coefficient, and inversely with axial load ratio as well as slenderness ratio. Many various influential factors are considered in the restoring force model of square HCFT columns. The model is close to the experimental results which can be conveniently applied for nonlinear dynamics analysis of composite structures.

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