Numerical simulation for the nonlinear behavior of laterally loaded barrettes
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TECHNICAL PAPER
Numerical simulation for the nonlinear behavior of laterally loaded barrettes Mohamed M. Mansour1 · Ayman L. Fayed2 · Mohamed M. Morsi2 Received: 9 May 2020 / Accepted: 14 October 2020 © Springer Nature Switzerland AG 2020
Abstract Full-scale lateral static load tests performed on rectangular barrette sections are commonly limited due to their large capacity and high testing cost. The soil–barrette system behaves nonlinearly, making it convoluted to understand its real behavior. In the present study, finite element analysis is utilized to simulate the soil–structure interaction of a full-scale lateral load test carried out on a large-section rectangular reinforced concrete barrette in Hong Kong. The effect of the tension cracking, in the reinforced concrete sections, on the flexural stiffness of the rectangular barrette under static lateral loading–unloading cycles is explored. A proposed approach of sequential decreasing the flexural stiffness, based on the ratio between the affecting and the cracking bending moment of the concrete section, to simulate the real concrete behavior resulting from the cracking effect, is applied in the developed numerical model for the case study. The conducted study showed that the proposed approach adopted to simulate the decrease in the concrete stiffness based on the bending moment level is reasonable to represent the actual response of the barrette to lateral loads and provides a practical alternative to the costly field loading tests. Keywords Cracking of concrete · Finite element analysis · Laterally loaded barrette · Nonlinear RC–soil interaction behavior · Static load test
Introduction The field loading test is the most reliable and consistent technique to obtain the real relationship between the applied lateral loads and corresponding displacements of deep foundations. However, such tests are quite expensive and hence seldom performed, especially for high capacity members as barrettes. Earlier, estimated earth pressure distribution from field or model tests was used to evaluate the laterally loaded pile behavior, Yin et al. [15]. Also, P–y curves method (known as load-transfer curve method) sets a relationship between the soil resistance and the lateral pile deflection where soil or rock is represented as * Mohamed M. Mansour [email protected] Ayman L. Fayed [email protected] Mohamed M. Morsi [email protected] 1
Dar Al-Handasah (Shair and Partners), Cairo, Egypt
Faculty of Engineering, Ain Shams University, Cairo, Egypt
2
series of independent springs. These conventional curves are typically applicable to piles installed in horizontal ground, Yang et al. [14]. In the present time, the three-dimensional finite element modeling was proven to give a good agreement between the 3D model results and the general trend observed in field as well as the behavior of pile resulting from p–y method when conducted on a single laterally loaded pile case study, Wong et al. [13]. Nowadays, available high capacity computers and advanc
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