1. Sr. Struct. Engr., Research and Development, McDermott Incorporated, P.O. Box 60035, New Orleans, La. 70160
2. Research Asst., Dept. of Civ. Engrg., Massachusetts Inst. of Tech., Cambridge, Mass. 02139
3. Assoc. Prof. of Civ. Engrg., Massachusetts Inst. of Tech., Cambridge, Mass. 02139