2 n d International Conference on New Developments in Soil Mechanics and Geotechnical Engineering, 28-30 May 2009, Near East University, Nicosia, North Cyprus 230 KEYWORDS: Single pile, p-y curves, full scale in-situ tests, lateral behaviour, monopile ABSTRACT: In many cases, the single piles should be analyzed for lateral loading. One of the most popular approaches to determine the lateral behavior of piles is load–transfer method, in which the pile is modeled as an elastic member and the soil is modeled as series of linear or nonlinear springs (p-y curves). In Pars Special Economic Energy Zone (Asalouyeh) in the south of Iran, a number of single piles as a dolphin were constructed and some full scale lateral loading tests were conducted on them under the supervision of the first author. The length and diameter of the piles were approximately 40 and 2 meters respectively. The lateral loading tests of such large piles are not commonly undertaken in all projects so the data are rare. In the presented research, a computer program has been developed to analyze a single pile under lateral loading by using the finite differences method. A large number of lateral spring models like Strain Wedge Model (SWM) have been used in the program and calibrated by the results of full scale lateral loading tests. To conclude, some appropriate models, which could produce accurate results in the analysis of lateral loaded piles in Petrochemical Port, are introduced. The research shows that the traditional p-y curves and also SWM calculate the pile head displacement more than the test’s data, and implies on the requisiteness of local calibration. 1 INTRODUCTION Pile foundations are commonly used to resist axial and lateral loads applied to structures. In many cases the lateral loads are more significant. For example, in pile-supported earth-retaining structures, in rise structures to against wind and earthquake forces, in offshore structures subjected to wind and wave action, and in piles that used as mooring or berthing dolphins (Figure 1). In these cases the piles should be analyzed for the lateral loads, and the interaction between the pile and soil should be modeled. A number of p – y curves was developed for sands (O’Neill and Murchinson 1983; Reese et al. 1974) and for clays (Dunnavant and O’Neill 1989; Matlock 1970). The traditional p – y curves are semi-empirical models and do not account for pile properties such as pile bending stiffness, pile cross-sectional shape, pile head restraint, pile installation method (Ashour and Norris 2000). Strain Wedge Model (SWM) can consider some of these limitations. However, both traditional p-y curves and SWM are the semi-empirical methods. In the other words, the main drawback to these approaches is that they are based on empirical parameters (i.e. the modulus of subgrade reaction) which can only be back figured from the results of pile load tests (Basile2003). Assessment of lateral load-transfer methods of piles by full scale in-situ tests Ali Fakher Associate Professor, Department of Civil Engineering, University of Tehran, Iran. Aslan Sadeghi-Hokmabadi & Alireza Saeedi-Azizkandi Postgraduate student, Department of Civil Engineering, University of Tehran, Iran; a.[email protected]
Assessment of lateral load-transfer methods of piles by full scale in-situ tests
May 20, 2023
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