scholarly journals COMPLEX OF STATIC LOADING TESTS OF BORED PILES

2019 ◽  
Vol 16 (58) ◽  
Author(s):  
Askar Zhussupbekov
Keyword(s):  
Static Loading ◽  
Loading Tests ◽  
Bored Piles

The Enhancement Effect Analysis of Pile-Base Post-Grouting Piles

2012 ◽  
Vol 170-173 ◽  
pp. 227-231 ◽  
Author(s):  
Rui Kun Zhang ◽  
Ming Lei Shi ◽  
Hao Zhang ◽  
Jin Wang
Keyword(s):  
Static Loading ◽  
Enhancement Effect ◽  
Limit States ◽  
Effect Analysis ◽  
Initial Loading ◽  
Mud Cake ◽  
Loading Tests ◽  
Bored Piles ◽  
Post Grouting

The pile-base post-grouting technology can solve the bottom slime and the shaft mud-cake which are the two principal deterioration factors of slurry bored piles. The enhancement effect of pile-base post-grouting was analyzed through the comparison static loading tests and summarization of literature data. The hysteretic nature of the enhancement effect was revealed and the abnormal phenomena was analyzed that the initial loading stiffness of deep pile with post-grouting was lower compared with the pile without post-grouting. The settlement-reducing effect of post-grouting is limited at serviceability limit states and the additional settlement effect of end resistance enhancement of pile with post-grouting is proposed.

Bidirectional cell tests on non-grouted and grouted large-diameter bored piles

2015 ◽  
Vol 2 (3,4) ◽  
pp. 105-117 ◽  
Author(s):  
Minh Hai Nguyen ◽  
Bengt H. Fellenius
Keyword(s):  
Static Loading ◽  
Large Diameter ◽  
Soft Clay ◽  
Silty Sand ◽  
Foundation Design ◽  
Average Unit ◽  
Load Movement ◽  
Loading Tests ◽  
Bored Piles ◽  
Four Levels

Abstract The 37-storey apartment buildings of the Everrich II project in HoChiMinh City, Vietnam was designed to be supported on a piled foundation consisting of bored piles assigned a 22-MN working load per pile. The foundation design included performing bidirectional-cell, static loading tests on four test piles. The soil profile consisted of organic soft clay to about 28 m depth followed by a thick deposit of sandy silt and silty sand with a density that gradually increased with depth from compact to dense, becoming very dense at 65 m depth. In March 2010, the test piles, one 1.5-m diameter pile and three 2.0-m diameter piles, were installed to 80 m through 85 m depth and constructed using bucket drill technique with bentonite slurry and a casing advanced ahead of the hole. The bidirectional-cell assemblies were installed at 10 m through 20 m above the pile toes. The piles were instrumented with pairs of diametrically opposed vibrating wire strain-gages at three to four levels below and six to seven levels above the respective cell levels. After completed concreting, the shaft grouting was carried out throughout a 20 m length above the pile toe for the 1.5-m diameter pile and for one of the 2.0-m diameter piles. The static loading tests were performed about 34 through 44 days after the piles had been concreted. The analysis of strain-gage records indicated an average Young’s modulus value of about 25 GPa for the nominal crosssections of the piles. The average unit grouted shaft resistances on the nominal pile diameters were about two to three times larger than the resistance along the non-grouted lengths. The measured load distribution of maximum mobilized shaft resistances corresponded to effective stress proportionality coefficients, ß, of about 0.2 through 0.3. The ultimate shaft resistance for the pile lengths below the bidirectional cells reached an ultimate value after about 8 to 10 mm movement, whereafter the load-movement was plastic. The pile toe stress-movement responses to toe stiffness were soft with no tendency toward an ultimate value.

scholarly journals Static Loading Tests of Glued Laminated Timber Joints with Drift-Pins. The Effect of MOE on Anisotropy of Mechanical Property.

2001 ◽  
Vol 50 (7) ◽  
pp. 745-750
Author(s):  
Masaki HARADA ◽  
Tomoyuki HAYASHI ◽  
Masahiko KARUBE ◽  
Akimitsu IIDA ◽  
Kohei KOMATSU
Keyword(s):  
Mechanical Property ◽  
Static Loading ◽  
Glued Laminated Timber ◽  
Loading Tests ◽  
Timber Joints

scholarly journals THE EXPERIENCE DIFFERENT OF PILING TESTING ON PROBLEMATICAL SOIL GROUND OF ASTANA, KAZAKHSTAN

2018 ◽  
Vol 14 (4) ◽  
pp. 158-171 ◽  
Author(s):  
Askar Zh. Zhussupbekov ◽  
Yoshinori Iwasaki ◽  
Abdulla R. Omarov
Keyword(s):  
Static Loading ◽  
Large Diameter ◽  
Capital City ◽  
Loading Test ◽  
Static Compression ◽  
Static Tests ◽  
Advantages And Disadvantages ◽  
Concrete Body ◽  
Static Loading Test ◽  
Bored Piles

At the present time, in Astana city is going on works by construction public transport system LRT (Light Railway Transport). LRT is an overhead road with two railway lines. The first stage of construction is including construction of overhead road (bridge) with 22,4 km length and 18 stations. The foundation of bridge is the bored piles with cross-section 1.0HL5 m and length 8-КЗ 5 m. In these conditions, very important to control integrity of concrete body of each bored piles. For checking integrity- applying two methods - Low Strain Method and Cross-Hole Sonic Logging. The aim of this paper is to discuss the advantages and disadvantages of each method using the examples of a real application. The article presents loading tests of large diameter and deep boring piles on the construction site in new capital city of the Republic of Kazakhstan. Finally, some recommendations for testmg methods suitable for problematical ground conditions of Kazakhstan are introduced. Traditionally, pile load tests in Kazakhstan are carried out using static loading test methods. Static pile loading test is the most reliable method to obtain the load-settlement relation of piles. Results of static pile tests using the static compression loading test (by ASTM). static loading test (by GOST) and bi-direction static loading test (by ASTM) methods are presented in this paper. Experienced bored piles with length of 31.5 m. diameter 1000 mm. Hereafter the results of underground testmg by the piles with the methods of vertical static tests of SLT. BDSLT and SCLT are presented, which had been made on Expo 2017 projects, buildings of Pavilion m Astana. Kazakhstan.

scholarly journals STATIC LOADING TESTS OF STEP PART IN STEEL FURRING SUSPENDED CEILING SYSTEM AND ESTIMATION OF REQUIRED DEFORMATION CAPACITY DURING EARTHQUAKES

2017 ◽  
Vol 23 (55) ◽  
pp. 827-831
Author(s):  
Keigo YAMASHITA ◽  
Tadashi ISHIHARA ◽  
Hirofumi KAMBE ◽  
Kento SUZUKI ◽  
Masayuki NAGANO
Keyword(s):  
Static Loading ◽  
Deformation Capacity ◽  
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.

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

Static Loading Tests of New Type of Bolt Assembly Connection Developed for Perspective Temporary Steel Railway Bridges

2014 ◽  
Vol 590 ◽  
pp. 331-335 ◽  
Author(s):  
Marcela Karmazínová ◽  
Michal Štrba
Keyword(s):  
Numerical Modelling ◽  
Failure Mechanism ◽  
Static Loading ◽  
Fatigue Loading ◽  
Preliminary Evaluation ◽  
Problem Solution ◽  
Static Tests ◽  
Actual Behaviour ◽  
Loading Tests ◽  
Plate Connections

The paper deals with the problems of the actual behaviour, failure mechanism and load-carrying capacity of the special bolt connection developed and intended for the assembly joints of the truss main girders chords of perspective railway steel temporary bridges. Within the framework of this problem solution, several types of structural details of assembly joints have been considered as the conceptual structural design. Based on the preliminary evaluation of advantages or disadvantages of these ones, in principle two basic structural configurations – so-called “tooth” and “splice plate” connections have been selected for the subsequent detailed investigation. This investigation is mainly based on the experimental verification of the actual behaviour, strain and failure mechanism and corresponding strength of the connection, and on its numerical modelling using FEM. This paper is focused only on the static loading tests results of the splice plate connections and their evaluation, which have already been finished. Simultaneously with the static tests, the fatigue loading tests are being realized, too, but they have not been finished so far, as well as the FEM numerical modelling.

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