Repeated load testing of a model plane strain footing

1978 ◽  
Vol 15 (2) ◽  
pp. 190-201 ◽  
Author(s):  
Gerald P. Raymond ◽  
Fadel El Komos
Keyword(s):  
Plane Strain ◽  
Cyclic Load ◽  
Load Test ◽  
Repeated Loading ◽  
Load Testing ◽  
Wheel Load ◽  
Foundation Soil ◽  
Static Tests ◽  
Static Test ◽  
In Series

A study is reported of experiments on model plane strain footings subject to repeated loading. The load was returned to zero at the end of each cycle. This is characteristic of a train wheel load passing over a railroad tie.Four series of tests were conducted. Series A consisted of static tests, which provided a comparison with series B. Series B consists of applying a cyclic load on the footing between zero load and a constant upper value. The upper value was varied from test to test and ranged from 13.5 to 90% of the static failure load. Series C was acyclic test that was a continuation of series B after a considerable deformation had occurred. The berms caused by the cyclic load test of series B were removed and a second cyclic test was conducted on the same foundation soil as the original test. Series D was a static test that was done as a continuation of series B. After removing the berms, as in series C, a static test was conducted in a manner similar to that for series A.The results have been quantified by the use of a hyperbolic fit and show that wider footings should perform better than narrower ones. This has been substantiated by examination of experimental railroad tests conducted by the Association of American Railroads.

scholarly journals Features of static pile load test

2021 ◽  
Vol 134 (1) ◽  
pp. 30-38
Author(s):  
A. Tulebekova ◽  
◽  
A. Zhussupbekov ◽  
Ye. Ashkey ◽  
A. Zhankina ◽  
...  
Keyword(s):  
Load Test ◽  
Capital City ◽  
Engineering Practice ◽  
Foundation Soil ◽  
Static Test ◽  
High Rise ◽  
Geological Conditions ◽  
Load Tests ◽  
Pile Load Tests ◽  
Compressible Soil

Pile foundations are commonly used in engineering practice to transfer the loads from heavy structures such as high-rise buildings to competent soil strata. In this manner, such complications as unfavorable geological conditions, compressible soil layers, and high levels of groundwater are avoided. Different types of piles are used in construction work. The specific type of pile used depends on the type of loading, the foundation soil, and the location of the groundwater table. The technical progress of large, bored piles and the continuous improvements of construction procedures and piling equipment today have created new possibilities. This paper describes a series of pile load tests that were performed in the capital city of Nur-Sultan, Kazakhstan. The control equipment, technological features are important for detailed information about the process of testing and the associated results make them more accurate and reliable. Keywords: pile, static test, load, equipment, soil

Comparison of the Bidirectional Load Test with the Top-Down Load Test

2005 ◽  
Vol 1936 (1) ◽  
pp. 108-116 ◽  
Author(s):  
Oh Sung Kwon ◽  
Yongkyu Choi ◽  
Ohkyun Kwon ◽  
Myoung Mo Kim
Keyword(s):  
Load Transfer ◽  
Measurement Data ◽  
Load Test ◽  
Load Testing ◽  
Pile Head ◽  
Top Down ◽  
Simple Method ◽  
Testing Method ◽  
Settlement Behavior ◽  
Cell Test

For the past decade, the Osterberg testing method (O-cell test) has been proved advantageous over the conventional pile load testing method in many aspects. However, because the O-cell test uses a loading mechanism entirely different from that of the conventional pile loading testing method, many investigators and practicing engineers have been concerned that the O-cell test would give inaccurate results, especially about the pile head settlement behavior. Therefore, a bidirectional load test using the Osterberg method and the conventional top-down load test were executed on 1.5-m diameter cast-in-place concrete piles at the same time and site. Strain gauges were placed on the piles. The two tests gave similar load transfer curves at various depth of piles. However, the top-down equivalent curve constructed from the bidirectional load test results predicted the pile head settlement under the pile design load to be approximately one half of that predicted by the conventional top-down load test. To improve the prediction accuracy of the top-down equivalent curve, a simple method that accounts for the pile compression was proposed. It was also shown that the strain gauge measurement data from the bidirectional load test could reproduce almost the same top-down curve.

Predicting the Ultimate Bearing Capacity of Single Piles Based on CPTU

2011 ◽  
Vol 243-249 ◽  
pp. 4402-4407
Author(s):  
Yong Hong Miao ◽  
Guo Jun Cai ◽  
Song Yu Liu
Keyword(s):  
Load Test ◽  
Load Testing ◽  
Pile Capacity ◽  
Piezocone Penetration Test ◽  
Load Carrying ◽  
Load Tests ◽  
Pile Load Test ◽  
Single Piles ◽  
Pile Load Tests ◽  
Best Fit

Six methods to determine axial pile capacity directly based on piezocone penetration test (CPTU) data are presented and evaluated. Analyses and evaluation were conducted on three types piles that were failed during pile load testing. The CPT methods, as well as the CPTU methods, were used to estimate the load carrying capacities of the investigated piles (Qp ). Pile load test were used to determine the measured load carrying capacities (Qm). The pile capacities determined using the different methods were compared with the measured pile capacities obtained from the pile load tests. Two criteria were selected as bases of evaluation: the best fit line for Qp versus Qm and the arithmetic mean and standard deviation for the ratio Qp /Qm. Results of the analyses showed that the best methods for determining pile capacity are the CPTU methods.

scholarly journals Numerical and Experimental UAV Structure Investigation by Pre-Flight Load Test

Sensors ◽  
2020 ◽  
Vol 20 (11) ◽  
pp. 3014 ◽  
Author(s):  
Artur Kurnyta ◽  
Wojciech Zielinski ◽  
Piotr Reymer ◽  
Krzysztof Dragan ◽  
Michal Dziendzikowski
Keyword(s):  
Computer Aided Design ◽  
Flight Test ◽  
Load Test ◽  
Load Spectrum ◽  
Static Test ◽  
Multi Stage ◽  
Post Test ◽  
Cad Modelling ◽  
Ground Test ◽  
Load Tests

This paper presents the preparation and execution of on-ground static and engine load tests for the composite unmanned aerial vehicle (UAV). The test was conducted for pre-flight structural strength verification of the remotely piloted aerial target named HORNET, after introducing some structural modifications. The ground tests were performed before the flight test campaign, to ensure the strength and operational safety of the modified structure. The panel method and Computer Aided Design (CAD) modelling were adopted for numerical evaluation of aerodynamic and inertial forces’ distribution to simulate loading scenarios for launch, flight and parachute deploying conditions during the static test. Then, the multi-stage airframe static test was prepared and executed with the use of a designed modular test rig, artificial masses, as well as a wireless strain measurement system to perform structure verification. The UAV was investigated with 150% of the typical load spectrum. Furthermore, an engine test was also conducted on a ground test stand to verify strain and vibration levels in correspondence to engine speed, as well as the reliability of data link and the lack of its interferences with wireless control and telemetry. In the article, data achieved from the numerical and experimental parts of the test are discussed, as well as post-test remarks are given.

Assessment of corroded reinforced concrete beams: Cyclic load test and acoustic emission techniques

2020 ◽  
Vol 233 ◽  
pp. 117291
Author(s):  
K.A. Shahid ◽  
N. Muhammad Bunnori ◽  
M.A. Megat Johari ◽  
Mohd H. Hassan ◽  
Ashiru Sani
Keyword(s):  
Acoustic Emission ◽  
Reinforced Concrete ◽  
Cyclic Load ◽  
Concrete Beams ◽  
Load Test ◽  
Reinforced Concrete Beams

scholarly journals Bridge Deck Load Testing Using Sensors and Optical Survey Equipment

2012 ◽  
Vol 2012 ◽  
pp. 1-11 ◽  
Author(s):  
Hubo Cai ◽  
Osama Abudayyeh ◽  
Ikhlas Abdel-Qader ◽  
Upul Attanayake ◽  
Joseph Barbera ◽  
...  
Keyword(s):  
Sensor Network ◽  
Structural Integrity ◽  
Structural Response ◽  
Lessons Learned ◽  
Load Test ◽  
Load Testing ◽  
Deck Panels ◽  
Test Study ◽  
Deflection Analysis

Bridges are under various loads and environmental impacts that cause them to lose their structural integrity. A significant number of bridges in US are either structurally deficient or functionally obsolete, requiring immediate attention. Nondestructive load testing is an effective approach to measure the structural response of a bridge under various loading conditions and to determine its structural integrity. This paper presents a load-test study that evaluated the response of a prefabricated bridge with full-depth precast deck panels in Michigan. This load-test program integrates optical surveying systems, a sensor network embedded in bridge decks, and surface deflection analysis. Its major contribution lies in the exploration of an embedded sensor network that was installed initially for long-term bridge monitoring in bridge load testing. Among a number of lessons learned, it is concluded that embedded sensor network has a great potential of providing an efficient and accurate approach for obtaining real-time equivalent static stresses under varying loading scenarios.

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