1 AIT Asian Institute of Technology

Infinite element algorithm for the elastodynamic torsion load transfer problem of a homogeneous half space

AuthorWijeyewickrema, Anil Christopher
Call NumberAIT Thesis no. ST-84-31
Subject(s)Structural dynamics--Mathematical models
NoteA thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Engineering and Technology
PublisherAsian Institute of Technology
AbstractA solution scheme is presented for torsional vibrations of cylindrical footings, partially embedded into a semi infinite medium . In this approach the near field is modelled with finite elements and the far field with infinite elements. An axisymmetric horizontal infinite element capable of propagating shear waves in the frequency domain is developed to solve the torsional load transfer problem. By making use o f the horizontal infinite element the near field size may be reduced in size, resulting in a system characterised by relatively few degrees of freedom, which provides a n economical solution to the load transfer problems. The applicability o f the new horizontal element is checked by finding the torsional compliance of a rigid circular plate subjected to harmonic loading. Torsional load transfer is investigated for the cases where the real moment amplitude of the complex excitation is constant and where the real moment amplitude is proportional to the square of the excitation frequency. An axisymmetric horizontal infinite element is developed. to solve the general load transfer problem in cylindrically orthotropic, elastic, infinite media. The element is capable of propagating Rayleigh , s hear and pressure waves in the frequency domain. The element could be used, together with the radial infinite element already available, in future research concerning elastodynamic load transfer problems.
Year1984
TypeThesis
SchoolSchool of Engineering and Technology
DepartmentDepartment of Civil and Infrastucture Engineering (DCIE)
Academic Program/FoSStructural Engineering (STE) /Former Name = Structural Engineering and Construction (ST)
Chairperson(s)Karasudhi, Pisidhi
Examination Committee(s)Worsak Kanok-Nukulchai ; Pichai Nimityongskul
Scholarship Donor(s)The Royal Norwegian Government
DegreeThesis (M.Eng.) - Asian Institute of Technology, 1984


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