Finite difference solution based on composite stiffness and bi-parameter method for calculating vertical and horizontal bending piles
CHEN Linjing1，YU Qifeng1，DAI Zihang1，2
(1. Institute of Geotechnical Engineering，Fuzhou University，Fuzhou，Fujian 350108，China；2. School of Civil，Mining and
Environmental Engineering，University of Wollongong，Wollongong，2522，Australia)
Abstract：To improve the accuracy and effectiveness in calculating the deformations and internal forces of piles with large exposure lengths under horizontal and vertical loads，a finite difference solution was established based on the composite stiffness principle and the bi-parameter method. A computation program was compiled by means of MATLAB. The reliability of this approach was verified through comparisons with the measured data from model tests or the calculated results of an engineering example with the existing methods. The comparisons showed that the approach was more convenient and faster than the link finite element method based on the same principle. It was also showed that，for piles with large exposure lengths under vertical loads，the gravity second-order effect must not be ignored and the vertical loads increased not only the bending moments of piles but also the shear forces. The influence of vertical loads on shear forces was not reflected in the current methods，which tended to be unsafe and should be noted in design calculations of vertical and horizontal bending piles.
龚晓南. 土工计算机分析[M]. 北京：中国建筑工业出版社，2000：11–30.(GONG Xiaonan. Geotechnical computer analysis[M]. Beijing：China Architecture and Building Press，2000：11–30.(in Chinese))
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2016, Vol. 35 
