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Showing 1 to 17 of 17 for “"drilled shaft"”.
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Axial load transfer in large scale physical model drilled shaft foundations
Drilled shaft foundations are a widely implemented type of deep foundation used to support heavy loads from superstructures such as buildings and bridges. Uncertainties exist in the axial load transfer behavior of drilled shafts subject to loading and unloading cycles. A better understanding of the …
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Seismic Performance of Column-to-Drilled-Shaft Connections in Reinforced Concrete Bridges
Drilled shaft foundations are often used to support reinforced concrete bridge columns founded in soft soils or in locations where a small footprint is desired. Increasingly, the shaft is being built with a diameter larger than that of the column, to allow tolerance in the column placement and to …
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Non-Contact Lap Splices in Geometrically Dissimilar Bridge Column to Drilled Shaft Connections
… columns interfacing directly with circular drilled shafts. However, there is a concern on the safety and cost-effectiveness of such non-contact lap splices because the guidelines in the current AASHTO LRFD code and studies on this type of connection are limited. This study presents an …
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Statnamic Lateral Load Testing and Analysis of a Drilled Shaft in Liquefied Sand
… load tests were performed on a 2.59 m diameter drilled shaft foundation after the surrounding soil was liquefied using down-hole explosive charges. An attempt to develop p-y curves from strain data along the pile was made. Due to low quality and lack of strain data, p-y curves along the test …
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Use of Ultimate Load Theories for Design of Drilled Shaft Sound Wall Foundations
… Department of Transportation for design of drilled shaft sound wall foundations. Field load tests were performed on eight inch and nine inch diameter drilled shafts, and the results were compared to theoretical solutions for ultimate lateral load capacity. Standard Penetration Tests were run …
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ANALYSIS OF THE EFFECTS OF HEAVILY LOADED MAT FOUNDATION ON ADJACENT DRILLED SHAFT FOUNDATION
… Construction of heavily loaded mat adjacent to drilled shafts would cause complex interaction between the foundations. However, lateral stress and drag forces on the shafts resulting from the heavy load on the mat foundation are the two major factors that would affect the design and performance …
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Full-Scale-Lateral-Load Test of a 1.2 m Diameter Drilled Shaft in Sand
… load tests were performed on two 1.2 m diameter drilled shafts and a 0.324 m diameter steel pipe pile in sand. Although the tests involve two different foundation types, the upper 2.4 m of the profile, which provides the majority of the lateral resistance, consists of sand compacted around both …
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Evaluation of Scale Effects in Load-Displacement Response of Drilled Shafts Based on Field Load Tests
… information about the nominal resistance of drilled shaft foundations. The application of load testing in drilled shaft foundations provides insight into the load-displacement behavior which can be used to reduce risk, improve reliability and confirm design assumptions. Typically, these tests …
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Load and resistance factor design of drilled shafts subjected to lateral loading at service limit state
… implementing LRFD techniques for design of drilled shaft subjected to lateral loads using reliability-based analysis. On a national level, the AASHTO LRFD Bridge Design Specifications (AASHTO, 2012) specify that a resistance factor of 1.0 be used for design of drilled shafts subjected to …
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Novel Application of Nondestructive Testing to Evaluate Anomalous Conditions in Drilled Shafts and the Geologic Materials Underlying Their Excavations
Drilled shafts are deep foundation elements created by excavating cylindrical shafts into the ground and filling them with concrete. Given the types of structures they support, failure to meet their performance criteria can jeopardize public safety and cause severe financial losses. Consequently, …
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Axial behavior of drilled shafts in soft rock
… are transferred to the more competent strata. Drilled shaft foundations are among the most commonly used types of deep foundations. Drilled shafts are often socketed into soft rock formations between near-surface residual soils and the unweathered bedrock that is commonly encountered at greater …
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The use of CPT for calculating axial capacity of drilled shafts
The use of drilled shafts has increased significantly in the last two decades due to their ability to carry large loads economically. Current methods for calculating axial capacity of drilled shafts rely heavily on static methods. The cone penetration test is a simple, fast, and economical test …
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Load and resistance factor design of drilled shafts in shale using SPT and TCP measurements
… Officials (AASHTO) design methods for design of drilled shafts in shale and other weak rock. These methods are generally based on Load and Resistance Factor Design (LRFD) methods that relate uniaxial compressive strength measurements of rock cores to the side and tip resistance for drilled …
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Design methods for deep foundations
… for analyzing laterally loaded piles and drilled shafts. A computer program that can be used to estimate deflections and maximum bending moments in single fixed-head piles (or drilled shafts) and in groups of fixed-head piles (or drilled shafts) was developed. Using this program, charts …
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A Multicriteria Based Quantitative Framework for Assessing Sustainability of Pile Foundations
… namely, the driven concrete pile and the drilled shaft, are considered. The impacts these two types of piles create on the environment are investigated from the viewpoints of both resource consumption and process emissions. A life cycle analysis (LCA) is performed to develop sustainability …
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Axial behavior of drilled shafts socketed into weak Pennsylvanian shales
DSpace SAF Submission Ingestion Package generated from Vireo submission #13215 on 2019-02-07 at 14:22:36
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Numerical modeling of a bridge system & its application for performance-based earthquake engineering
… was a two-span portion of a bridge supported by drilled-shaft foundations embedded in competent soil (dry dense sand) and subjected to shaking in the transverse direction. The other represented a typical five-span highway bridge system supported by pile group foundations embedded in liquefiable …