1. Engr., Shell Development Co., Houston, Tex.; formerly at Fritz Engrg. Lab., Lehigh Univ., Bethlehem, Pa.
2. Assoc. Prof. of Civ. Engrg., Univ. of Alberta, Edmonton, Canada; formerly at Fritz Engrg. Lab., Lehigh Univ., Bethlehem, Pa.
3. Assoc. Prof. of Civ. Engrg., Lehigh Univ., Bethlehem, Pa.