Rational Analysis of the Lateral Performance of Offshore Pile Groups

Abstract

This p~per was prepared for presentation~t the Fifth Annual Offshore Technology Conference held in Houston, Tex., April 29-May 2, 1973. Permission to copy is restricted to an abstract ofñ ot more than 300 words;-Illustrations may not be copied. Such use of an abstract should contain conspicuous aclglOwledgment~of where~d by whom the paper is presented.ABSTRACT An approximate procedure for predicting the behavior of laterally loaded offshore pile groups is developed. This procedure combines subgrade reaction (ply) analyses with elastic half-space procedures with both techniques modified to usetheir features most applicable to this problem. Results c)btai~~d_by ana"lyses of five circular groups plann_ed for support of North Sea structures are presented.

Analysis of Laterally Loaded Piles in Multilayered Soil Deposits

“…Focht and Koch (1973) combined the integral equation approach of Poulos (1971b) and the p-y method, assuming that the deflection of a pile group depends both on the nonlinear soil behavior and on the pile-soilpile interaction. A similar hybrid model was developed by Leung and Chow (1987), who modeled the soil response using the subgrade reaction method, and interaction between piles was captured using Mindlin's solution.…”

“…A similar hybrid model was developed by Leung and Chow (1987), who modeled the soil response using the subgrade reaction method, and interaction between piles was captured using Mindlin's solution. Reese et al (1984) modified the method of Focht and Koch (1973) by calculating the elastic deflection from the linear portion of the p-y curves. O'Neill et al (1977) proposed a mixed method involving Mindlin's solution and functional relationships between load and deformations at the pile head, which were developed using the finite difference method and cubic spline functions.…”

Laboratory modeling of laterally loaded pile groups in sand

“…However, these methods give similar shear distributions for all the rows within the group, which disagrees with both field data and the pile shadowing theory. Focht and Koch (1973) proposed another method combining the p-y method for single piles with Poulos's approach (1971) for pile groups. Based on Focht and Koch's (1973) procedure and the characteristic load method by Duncan et al (1994), Ooi and Duncan (1994) developed a group amplification procedure.…”

A modulus‐multiplier approach for non‐linear analysis of laterally loaded pile groups

“…Most methods using p-y curves to predict group effects modify the single pile p-y curve to represent the p-y relationship for a pile within a group. Three different techniques have been proposed to modify the single pile p-y curves to account for group effects: the y-multiplier approach [13], the p-multiplier approach [4,5], and the modulus-multiplier approach [14]. Schematic representations of the three approaches are shown in Figure 7.…”