THREE-DIMENSIONAL NONLINEAR FINITE ELEMENT MODEL FOR SINGLE AND MULTIPLE DOWEL-TYPE WOOD CONNECTIONS by JUNG-PYO HONG B.Sc., Seoul National University, 1994 M.Sc., Seoul National University, 1999 A THESIS SUBMITTED IN PARTIAL FULFILMENT OF THE REQUIREMENTS FOR THE DEGREE OF DOCTOR OF PHILOSOPHY in THE FACULTY OF GRADUATE STUDIES (Forestry) THE UNIVERSITY OF BRITISH COLUMBIA December 2007 © Jung-Pyo Hong 2007