Evaluation of FHWA Pile Design Method against the FHWA Deep Foundation Load Test Database Version 2.0

2018 ◽  
Vol 2672 (52) ◽  
pp. 268-277 ◽  
Author(s):  
Nikolaos Machairas ◽  
Gregory A. Highley ◽  
Magued G. Iskander
Keyword(s):  
Static Load ◽  
Design Method ◽  
Load Capacity ◽  
Design Methods ◽  
Load Test ◽  
Preliminary Evaluation ◽  
Deep Foundation ◽  
Testing Procedures ◽  
Pile Design ◽  
Test Database

The efficacy of the FHWA pile design method was explored using data made possible by the 2017 release of FHWA Deep Foundation Load Test Database (DFLTD) v.2. Information contained within DFLTD v.2 was leveraged to evaluate the most common pile design methods against failure loads obtained via in situ static load testing procedures. In the process, the authors developed a custom relational database and software to batch process the available information. The scope was limited to impact-driven, un-tapered, steel and concrete piles, loaded in compression, using a static load test. DFLTD v.2 contains 3,116 unique-combination project/exploration/foundation/test cases of which 213 contained sufficient data to permit batch processing of the results to compute the axial load capacity and interpret the static failure load, according to the study scope. Scatter between measured (interpreted) and predicted capacities is significant; the computed capacity was off by a factor of 2 in many tests. The range in calculated to measured capacities ( Qc/Qm) was from 0.12 to 8.88, and the mean Qc/Qm was 1.48. Preliminary evaluation suggests that the method performs better in clay than in sand, and overpredicts the capacities of long and larger diameter piles. The authors trust that this study will permit engineers and state agencies to better understand the efficacy of the most commonly employed design methods, resulting in a more resilient infrastructure.

scholarly journals Towards building a neural network model for predicting pile static load test curves

2018 ◽  
Vol 149 ◽  
pp. 02031
Author(s):  
A. K. Alzo’ubi ◽  
Farid Ibrahim
Keyword(s):  
Neural Network ◽  
Artificial Neural Network ◽  
Network Model ◽  
Neural Network Model ◽  
Static Load ◽  
Load Test ◽  
Static Load Test ◽  
Deep Foundation ◽  
Suggested Approach ◽  
Artificial Neural

In the United Arab Emirates, Continuous Flight Auger piles are the most widely used type of deep foundation. To test the pile behaviour, the Static Load Test is routinely conducted in the field by increasing the dead load while monitoring the displacement. Although the test is reliable, it is expensive to conduct. This test is usually conducted in the UAE to verify the pile capacity and displacement as the load increase and decreases in two cycles. In this paper we will utilize the Artificial Neural Network approach to build a model that can predict a complete Static Load Pile test. We will show that by integrating the pile configuration, soil properties, and ground water table in one artificial neural network model, the Static Load Test can be predicted with confidence. We believe that based on this approach, the model is able to predict the entire pile load test from start to end. The suggested approach is an excellent tool to reduce the cost associated with such expensive tests or to predict pile’s performance ahead of the actual test.

scholarly journals Evaluation of the Static Design Procedure in the Canadian Foundation Engineering Manual for Piles in Cohesionless Soil

Geosciences ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 472
Author(s):  
Hany El Naggar ◽  
Islam Ezzeldin
Keyword(s):  
Design Method ◽  
Design Procedure ◽  
Friction Angle ◽  
American Petroleum Institute ◽  
Load Test ◽  
Cohesionless Soil ◽  
Foundation Engineering ◽  
Cohesionless Soils ◽  
Foundation Soil ◽  
Pile Design

Piles provide a convenient solution for heavy structures, where the foundation soil bearing capacity, or the tolerable settlement may be exceeded due to the applied loads. In cohesionless soils, the two frequently used pile installation methods are driving and drilling (or boring). This paper reviews the results of a large database of pile load tests of driven and drilled piles in cohesionless soils at various locations worldwide. The load test results are compared with the static analysis design method for single piles recommended in the Canadian Foundation Engineering Manual (CFEM) and other codes and standards such as the American Association of State Highway and Transportation Officials, Federal Highway Administration, American Petroleum Institute, Eurocode, and the Naval Facilities Engineering Command. An improved pile design procedure is proposed linking the pile design coefficients and to the friction angle of the soil, rather than employing the generalized soil type grouping scheme previously used in the CFEM. This improvement included in the new version of the CFEM 2021 produces a more unified value of the pile capacity calculated by different designers, reducing the obtained design capacity discrepancies.

scholarly journals Static load test curve (Q–s) conversion in to pile of different size

2018 ◽  
Vol 50 (2) ◽  
pp. 171-182
Author(s):  
Zygmunt Meyer ◽  
Kamil Stachecki
Keyword(s):  
Mathematical Description ◽  
Static Load ◽  
Load Capacity ◽  
Limit Load ◽  
Load Test ◽  
Static Load Test ◽  
Load Curve ◽  
Load Tests ◽  
Different Diameters ◽  
Calculation Analysis

Abstract In the work authors analysed possibility of obtaining static load tests curve for a pile in case of changed diameter, using load curve based on results of static load tests for given diameter. In calculation analysis authors used Meyer–Kowalów (M-K) method. A mathematical description was shown of determining new M-K curve for a pile with changed diameter, taking as a basis original M-K curve obtained from static load tests. Then an example of calculations is presented in which parameters of M-K model for a new curve were determined. Simulation calculations were carried out in the original computer program, the results of which includes load curves for piles with different diameters and relations between diameter changes, limit load capacity and settlement of a pile.

scholarly journals A Comparison between Static and Repeated Load Test to Predict Asphalt Concrete Rut Depth

2021 ◽  
Vol 11 (4) ◽  
pp. 7363-7369
Author(s):  
F. Alzaidy ◽  
A. H. K. Albayati
Keyword(s):  
Asphalt Concrete ◽  
Static Load ◽  
Design Method ◽  
Testing Temperature ◽  
Load Test ◽  
Compression Tests ◽  
Static Load Test ◽  
Permanent Strain ◽  
Repeated Load ◽  
The Relationship

Rutting has a significant impact on the pavements' performance. Rutting depth is often used as a parameter to assess the quality of pavements. The Asphalt Institute (AI) design method prescribes a maximum allowable rutting depth of 13mm, whereas the AASHTO design method stipulates a critical serviceability index of 2.5 which is equivalent to an average rutting depth of 15mm. In this research, static and repeated compression tests were performed to evaluate the permanent strain based on (1) the relationship between mix properties (asphalt content and type), and (2) testing temperature. The results indicated that the accumulated plastic strain was higher during the repeated load test than that during the static load tests. Notably, temperature played a major role. The power-law model was used to describe the relationship between the accumulated permanent strain and the number of load repetitions. Furthermore, graphical analysis was performed using VESYS 5W to predict the rut depth for the asphalt concrete layer. The α and µ parameters affected the predicted rut depth significantly. The results show a substantial difference between the two tests, indicating that the repeated load test is more adequate, useful, and accurate when compared with the static load test for the evaluation of the rut depth.

Review of Design Methods of the Ultimate Side Shear and Base Resistance for Rock-Socketed Pile

2013 ◽  
Vol 353-356 ◽  
pp. 60-67 ◽  
Author(s):  
Guo Liang Dai ◽  
Abdellatif Boucheloukh ◽  
Wei Ming Gong
Keyword(s):  
Compressive Strength ◽  
Unconfined Compressive Strength ◽  
Ultimate Load ◽  
Load Capacity ◽  
Design Methods ◽  
Load Test ◽  
Rock Properties ◽  
Base Resistance ◽  
Ultimate Load Capacity ◽  
The Relationship

To determine the ultimate load capacity of drilled shaft socketed into rock under axial compression loading, it is necessary to predict both the ultimate side shear resistance and the base resistance based on field load test or/ and laboratory tests. In geotechnical engineering there are several methods proposed the relationship between rock properties (the unconfined compressive strength) and the ultimate side shears resistance and base resistance. This paper presents the review of design methods of ultimate side shear and base resistance for rock-socketed pile. These empirical functions depend on the socket type and the range of the unconfined compressive strength of rock.

Crack Behaviour of Retrofitted Pre-Tensioned Concrete Beam

2015 ◽  
Vol 752-753 ◽  
pp. 605-609
Author(s):  
Nurul Huda Suliman ◽  
A. Abu Bakar ◽  
Siti Hawa Hamzah ◽  
Norzahiah Shahar
Keyword(s):  
Critical Load ◽  
Concrete Beam ◽  
Static Load ◽  
Load Capacity ◽  
Maximum Load ◽  
Load Test ◽  
Static Load Test ◽  
Structural Durability ◽  
Before And After ◽  
Maintenance Process

Crack is a common cause of the degradation of concrete and may affect its structural durability. In order to ensure the bridge is safe utilized in anticipated period of their future service, a proper maintenance process and procedure should be taken. Therefore in this study, static load test were performed on a pre-tensioned (PRT) concrete beam to investigate crack behaviour before and after retrofitting process as well as to determine the effectiveness of the retrofitting method. A control beam named PRTB1 will fully loaded until fail to determine its maximum load capacity and critical load of the beam. Hence another beam named PRTB-FRP will be loaded until it reached it critical load capacity before retrofitted using Fiber Reinforced Polymer (FRP) plates located beneath the centre of the beam. After the retrofitting process PRTB-FRP will be put again under the static load. The load capacity of PRTB-FRP increased compared to PRTB1 with some improvement in crack propagation behaviour after retrofitted.

The Comparison of Pile Load Capacity Based on the Results of Analytical Calculations and Static Tests

2015 ◽  
Vol 725-726 ◽  
pp. 190-194
Author(s):  
Andrey Badanin ◽  
Victor Melnikov ◽  
Darya Filippova
Keyword(s):  
Static Load ◽  
Load Capacity ◽  
Load Test ◽  
Construction Technology ◽  
Construction Site ◽  
Static Load Test ◽  
Static Tests ◽  
Saint Petersburg

The article discusses the causes of discrepancies in the values of the pile load capacity based on the results of calculations made on the basis of existing regulations and the pile load capacity after static load test on the construction site. A brief overview of the causes of discrepancies in analytical and practical values ​​of pile load capacity is provided in the article. The possible ways to solve this problem are suggested, namely, the development of the methods of analytical calculations of pile load capacity and the improvement of embedding technical processes. There is an example of such a discrepancy in the construction of a residential complex in Saint-Petersburg presented in the article. It was found that the variation in the results is not caused by the imperfections in the method of calculations, but by the infringements of construction technology. The article provides recommendations to minimize the discrepancies between the calculated and actual values of pile load capacity.

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