UCRt JC-121667 PREPRINT Ground Motion Estimation and Nonlinear Seismic Analysis D. B. McCallen L. J. Hutchings This paper was prepared for submittal to the 12th Conference on Analysis and Computation of the American Society of Civil Engineers Chicago, Illinois April 15-18,1996 August 14,1995 Tkisisapreprintof apaperintendedforpublicationina journal orproceedings. Since chastges may be made before publication, this preprint is made available with the understandingthat it will not be cited or reproducedwithout the permission of the author.