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Elastic solutions due to a time-harmonic point load in isotropic multi-layered media
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 Title & Authors
Elastic solutions due to a time-harmonic point load in isotropic multi-layered media
Lin, Gao; Zhang, Pengchong; Liu, Jun; Wang, Wenyuan;
 Abstract
A new analytical derivation of the elastodynamic point load solutions for an isotropic multi-layered half-space is presented by means of the precise integration method (PIM) and the approach of dual vector. The time-harmonic external load is prescribed either on the external boundary or in the interior of the solid medium. Starting with the axisymmetric governing motion equations in a cylindrical coordinate system, a second order ordinary differential matrix equation can be gained by making use of the Hankel integral transform. Employing the technique of dual vector, the second order ordinary differential matrix equation can be simplified into a first-order one. The approach of PIM is implemented to obtain the solutions of the ordinary differential matrix equation in the Hankel integral transform domain. The PIM is a highly accurate algorithm to solve sets of first-order ordinary differential equations and any desired accuracy of the dynamic point load solutions can be achieved. The numerical simulation is based on algebraic matrix operation. As a result, the computational effort is reduced to a great extent and the computation is unconditionally stable. Selected numerical trials are given to validate the accuracy and applicability of the proposed approach. More examples are discussed to portray the dependence of the load-displacement response on the isotropic parameters of the multi-layered media, the depth of external load and the frequency of excitation.
 Keywords
time-harmonic point load;precise integration method;Hankel integral transform;dual vector;stratified soil;
 Language
English
 Cited by
1.
Moving load response on the stresses produced in an irregular microstretch substrate,;;;;

Structural Engineering and Mechanics, 2016. vol.60. 2, pp.175-191 crossref(new window)
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Moving load response on the stresses produced in an irregular microstretch substrate, Structural Engineering and Mechanics, 2016, 60, 2, 175  crossref(new windwow)
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