Abstract
ABSTRACT: Conventional interpretation procedures of load tests on instrumented piles rely upon measurements of strains that assume as zero for strains measured at the instant immediately before starting the test as reference configuration. However, some experimental evidence shows that concrete in drilled shafts undergoes strains induced by the curing process comparable in magnitude to the strains measured during the load tests. It is therefore expected that mobilization of shaft friction takes place before the load test. Several authors have performed experimental and numerical analyses aiming to quantify the influence of those pre-load test concrete volumetric strains on the measured bearing capacity using different approaches. The present work aimed to establish a reference framework for the existing and future works on this topic. In order to assess the influence of concrete strains induced by curing process on the shaft friction before the start of the load tests in drilled shafts, several finite element numerical simulations are performed, considering the thermal, autogenous and drying strains. The analyses consider concrete as an isotropic linear-elastic material and the soil as an elastic-plastic material using the Mohr-Coulomb constitutive model natively implemented in the software ABAQUS. The results are interpreted focusing on the relevancy on the bearing capacity and load distribution along drilled shafts considering or not the strains induced by concrete curing.
Highlights
The consideration of shaft friction mobilized during the installation of driven piles, prior to load test procedures, is a fundamental issue in foundation engineering [1]
Focusing the analyses on the effects induced on the shaft friction of floating drilled shafts embedded in granular soils, in the pre-load test stage, Mascarucci [10] and Mascarucci et al [11] performed axisymmetric numerical simulations in axially load piles considering curing strains coupled with evolving stiffness during the curing process
Restricting the subsequent analysis to concrete drilled shaft embedded in granular soils, this work focuses on the effects induced on the shaft friction by concrete curing strains during pre-load test stage
Summary
The consideration of shaft friction mobilized during the installation of driven piles, prior to load test procedures, is a fundamental issue in foundation engineering [1]. “A simplified numerical approach to the evaluation of residual shaft friction induced by concrete curing in drilled shafts on granular soils,” Rev. IBRACON Estrut.
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
