scholarly journals PERFORMANCE VERIFICATION THROUGH FULL-SCALE STATIC LOADING TESTS FOR A STRUCTURAL SYSTEM USING HIGH STRENGTH STEEL

2013 ◽  
Vol 78 (687) ◽  
pp. 1007-1016 ◽  
Author(s):  
Masayoshi NAKAI ◽  
Kazuaki TSUDA ◽  
Shinji MASE ◽  
Hiroyuki NARIHARA ◽  
Takashi OKAYASU ◽  
...  
Keyword(s):  
Static Loading ◽  
High Strength Steel ◽  
High Strength ◽  
Full Scale ◽  
Structural System ◽  
Performance Verification ◽  
Loading Tests

Field study of residual forces developed in pre-stressed high-strength concrete (PHC) pipe piles

2016 ◽  
Vol 53 (4) ◽  
pp. 696-707 ◽  
Author(s):  
Hai-lei Kou ◽  
Jian Chu ◽  
Wei Guo ◽  
Ming-yi Zhang
Keyword(s):  
Static Loading ◽  
High Strength Concrete ◽  
Large Scale ◽  
Load Transfer ◽  
High Strength ◽  
Neutral Plane ◽  
Shaft Resistance ◽  
Strength Concrete ◽  
Loading Tests ◽  
Residual Force

A large-scale field testing program for the study of residual forces in pre-stressed high-strength concrete (PHC) pipe piles is presented in this paper. Five open-ended PHC pipe piles with 13 or 18 m in embedded length were installed and used for static loading tests at a building site in Hangzhou, China. All the piles were instrumented with fiber Bragg grating (FBG) strain gauges. The residual forces in these piles were recorded during and after installation. The measured load transfer data along a pile during the static loading tests are reported. The effect of the residual force on the interpretation of the load transfer behavior is discussed. The field data show that residual force along the installed pile increases approximately exponentially to the neutral plane and then reduces towards the toe. The residual force decreases with time to a stable value after pile jacking due to the secondary interaction between the pile and the disturbed soil around the pile and other factors. The large residual forces along the PHC pipe piles significantly affect the evaluation of the pile load distributions, and thus the shaft and toe resistances. The conventional bearing capacity theory tends to overestimate the shaft resistance at positions above the neutral plane and underestimate the shaft resistance at positions below the neutral plane, and the toe resistance for an open-ended PHC pipe piles founded in stratified soils.

11.59: Study on highly elastic seismic structural system based on very-high strength steel and damage-control fuses

ce/papers ◽  
2017 ◽  
Vol 1 (2-3) ◽  
pp. 3315-3320 ◽  
Author(s):  
Xuchuan Lin ◽  
Yangyang Hu ◽  
Taichiro Okazaki
Keyword(s):  
High Strength Steel ◽  
Damage Control ◽  
High Strength ◽  
Structural System ◽  
Very High

Cathodic Protection of Prestressed Bridge Members—Full-Scale Testing

1996 ◽  
Vol 1561 (1) ◽  
pp. 13-25 ◽  
Author(s):  
Miki Funahashi ◽  
Walter T. Young
Keyword(s):  
Cathodic Protection ◽  
High Strength Steel ◽  
Silver Chloride ◽  
High Strength ◽  
Full Scale ◽  
Constant Current ◽  
Control Points ◽  
Beneficial Effects ◽  
Potential Control ◽  
Post Tensioned

The results of a study on the use of cathodic protection on prestressed and post-tensioned concrete bridge members are summarized. Previous laboratory tests to evaluate hydrogen embrittlement of high strength steel embedded in concrete have proven that cathodic protection will generate hydrogen on high-strength steel in concrete if the potential is more negative than the thermodynamic hydrogen evolution potential. The hydrogen generated will enter the steel and cause a loss in ductility that will adversely affect the steel's performance if a notch is present. Full-scale beams were constructed to further study those phenomena. Four pretensioned beams were constructed. In addition, two post-tensioned slabs were constructed to evaluate cathodic protection of anchorages and tendons encased in metal or plastic conduits. Cathodic protection currents were supplied by IR drop-free potential controlled rectifiers. Good potential control at control points was achieved by using externally mounted silver-silver chloride reference electrodes and a conductive gel bridge. However, inconsistent potential control occurred at locations other than at the control points. Later in the study, constant current power supplies were used on two of the beams. Hydrogen entering the steel as the result of corrosion appears to have masked the presence of hydrogen that might have been produced by cathodic protection. The analysis also revealed that there was corrosion of some pretensioned wires at crossings with interior steel reinforcing bars due to interference (stray current) caused by cathodic protection application. Analysis of the post-tensioned slabs indicated little effect of cathodic protection on tendons inside plastic or metal ducts from the application of cathodic protection. Beneficial effects were noted on anchor points where mortar was in contact with the metal.

Experimental Study on Axial Compression Performance of Full-Scale Square Columns of Reinforced Concrete Confined by High-Strength Reinforcement Hoops

2012 ◽  
Vol 446-449 ◽  
pp. 981-988
Author(s):  
Zhen Bao Li ◽  
Wen Jing Wang ◽  
Wei Jing Zhang ◽  
Yun Da Shao ◽  
Bing Zhang ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Yield Strength ◽  
Bearing Capacity ◽  
Axial Compression ◽  
High Strength Steel ◽  
High Strength ◽  
Concrete Columns ◽  
Full Scale ◽  
Compression Performance ◽  
Deformation Ability

Axial compression experiments of four full-scale reinforced concrete columns of two groups were carried out. One group of three columns used high-strength steel with the yield strength of 1000MPa as reinforcement hoops, and the second group used the ordinary-strength steel with yield strength of 400MPa. The axial compressive performances between these two groups were assessed. Compared to the specimen using the ordinary-strength steel, the axial compressive bearing capacity of using the high strength steel dose not increase significantly, while the deformation ability increases greatly. The results also indicate that the stress redistributions of the hoops and the concrete sections are obvious, and long-lasting when specimens achieve the ultimate bearing capacity after the yield of the rebar and local damage of concrete materials, at this time the strain of the specimens developes a lot, especially stress - strain curves of speciments with high-strength hoop all show a wide and flat top.

Bond Strength and Damage of Long Rebar Anchored in HPC under Static and Fatigue Loading

2006 ◽  
Vol 324-325 ◽  
pp. 867-870 ◽  
Author(s):  
Jian Zhuang Xiao ◽  
Chuan Zeng Zhang ◽  
Horst Falkner
Keyword(s):  
Static Loading ◽  
High Strength Steel ◽  
High Performance ◽  
High Performance Concrete ◽  
High Strength ◽  
Fatigue Loading ◽  
Element Analysis ◽  
Bond Behaviour ◽  
Steel Bar ◽  
Reinforcement Bar

This paper presents an experimental study on the anchorage behaviour of long high-strength steel rebars embedded in high-performance concrete (HPC) under both static loading and fatigue loading. The HPC was designed as C60 with its cube compressive strength larger than 60 MPa, and the high-strength steel bar was adopted as HRB500 with its characteristic yield strength equals 500 MPa. Under 3×106 fatigue loading cycles and then followed by a monotonous static loading, the strain and the stress state of the reinforcement bar, and the bond stress between the concrete and the 700 mm-long bar were investigated. Based on the test results and the ANSYS finite element analysis, the bond behaviour between HPC and long high-strength steel bars is discussed.

Structural Properties of Air-Supported Structures

1987 ◽  
Vol 2 (4) ◽  
pp. 195-203 ◽  
Author(s):  
Tetsuo Ikoma
Keyword(s):  
Static Loading ◽  
Structural Characteristics ◽  
Full Scale ◽  
Wind Pressure ◽  
Pressure Measurements ◽  
Snow Load ◽  
Melting Snow ◽  
Tunnel Model ◽  
Double Skin ◽  
Loading Tests

This paper describes the results of static loading tests simulating snow load, of wind pressure measurements and of melting snow tests, respectively, concerning full scale air-supported domes. Static loading tests are conducted for a full scale single-skin air-supported dome, whereas wind pressure measurements are performed using two kinds of model. One is the full scale dome mentioned above, the other is the wind tunnel model. Furthermore, melting snow tests are performed using another full scale double-skin dome in order to investigate how much snow can be melted artificially. Through these series of tests, structural characteristics of this kind of structure against snow load and wind load are confirmed. The results of loading tests and melting snow tests are compared with analytical results; good agreement is obtained.

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