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ACKNOWLEDGMENTS The research reported herein was performed under NCHRP Project 20-7, Task 92 by Whitlock Dalrymple Poston & Associates, Inc. Dr. Randall W. Poston, Principal, Whitlock Dalrymple Poston & Associates, Inc., was the principal investigator. The other investigator for this project was Mr. Jeffrey P. Wouters, Senior Structural Engineer, of Whitlock Dalrymple Poston & Associates, Inc. Dr. John E. Breen, the Nasser I. Al-Rashid Chair in Civil Eng~neenng, and Mr. Jeffrey S. West, Research Engineer, both of the Ferguson Structural Engineering Laboratory at the University of Texas at Austin served as consultants to the study. .