Performance Assessment of Laterally-Loaded Normal and High Strength Steel-Reinforced Drilled Shafts Using 1-D and 3-D Numerical Methods


Abstract eng:
The use of high strength steel reinforcement bar in drilled shaft construction is not common in transportation infrastructure applications due to the lack of familiarity with the materials, performance characteristics, and the suitability of existing methods for the assessment of performance. For example, traditional 1-D modeling approaches may not adequately capture the beneficial effect of concrete confinement, related to the presence of stiffer flexural and shear reinforcement distributed throughout the steel reinforcement cage, on the global strength and stiffness to lateral loads. This effect is critical to evaluate, as the use of high strength bar necessarily leads to less area of steel in a drilled shaft foundation. However, the use of high strength bar would yield less congested steel cages and development of fewer construction defects as a result, and would also be quicker to construct, and easier to handle. Studies illustrating the suitability of traditional approaches for modeling the performance of high strength steel-reinforced drilled shafts could assist practitioners in allowing such materials in their specifications. This paper describes the results of comparative numerical studies performed to evaluate the performance of 1-D p-y methods to predict the lateral load response of drilled shafts reinforced with normal (60 ksi) and high strength (80 ksi) steel reinforcement. The performance of 1-D methods is evaluated using sophisticated 3-D methods that account for the distribution of steel within the shaft cross-section and its effect on concrete confinement, as well as scale or diameter effects on the lateral soil response. These studies indicate that the 1-D methods are sufficiently accurate for use in design of shafts with high strength reinforcement, but remain susceptible to scale effects.

Conference Title:
Conference Title:
16th World Conference on Earthquake Engineering
Conference Venue:
Santiago (CL)
Conference Dates:
2017-01-09 / 2017-01-13
Rights:
Text je chráněný podle autorského zákona č. 121/2000 Sb.



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 Record created 2017-01-18, last modified 2017-01-18


Original version of the author's contribution as presented on USB, paper 4921.:
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