Numerical solution of link finite element based on composite stiffness and bi-parameter method for computation of laterally loaded single pile
To enhance the reliability and effectiveness in design of laterally loaded single pile, a link finite element method based on the principle of composite stiffness and bi-parameter was presented. Some flaws in the m-method recommended by the current technical codes for the design of laterally loaded pile were pin pointed through theoretical analyse and static loading experiments, and a modified method was proposed. Unlike the analytical approach, the is link finite element method established in this paper has no restrictions in parameter selection and avoids tedious calculations of table looking-up. In addition, it is not necessary to assume the restraint conditions of piles tips and discriminate the long, short or medium piles. Comparisons with the practical examples showed that the results between the link finite element method and analytical approach agreed well when the same composite stiffnesses and bi-parameters were employed. The calculated displacements and rotation angles at the tops of the piles and the maximum bending moments and their positions were in agreement with the measurement. Comparisons also showed that better results than those of the analytical approach was achieved through multiple trial calculating and adjusting of the exponent n and composite stiffness EI when the values of the proportional coefficient m were determined according to various layers of soil around the piles.