NSF Org:	CMMI Division of Civil, Mechanical, and Manufacturing Innovation
Recipient:	UNIVERSITY OF TEXAS AT AUSTIN
Initial Amendment Date:	August 20, 1990
Latest Amendment Date:	October 30, 1992
Award Number:	9016828
Award Instrument:	Continuing Grant
Program Manager:	Shih-Chi Liu CMMI  Division of Civil, Mechanical, and Manufacturing Innovation ENG  Directorate for Engineering
Start Date:	August 15, 1990
End Date:	January 31, 1994 (Estimated)
Total Intended Award Amount:	$243,300.00
Total Awarded Amount to Date:	$243,300.00
Funds Obligated to Date:	FY 1990 = $126,000.00 FY 1992 = $59,500.00 FY 1993 = $57,800.00
History of Investigator:	Michael Engelhardt (Principal Investigator) mde@mail.utexas.edu James Jirsa (Co-Principal Investigator) Michael Kreger (Co-Principal Investigator)
Recipient Sponsored Research Office:	University of Texas at Austin 110 INNER CAMPUS DR AUSTIN TX  US  78712-1139 (512)471-6424
Sponsor Congressional District:	25
Primary Place of Performance:	DATA NOT AVAILABLE
Primary Place of Performance Congressional District:
Unique Entity Identifier (UEI):	V6AFQPN18437
Parent UEI:
NSF Program(s):	ARCHITECTURE & MECHAN SYSTEMS, STRUCTURES II
Primary Program Source:	app-0193
Program Reference Code(s):	1498
Program Element Code(s):	149700, 149800
Award Agency Code:	4900
Fund Agency Code:	4900
Assistance Listing Number(s):	47.041

ABSTRACT

This project is supported under NSF Announcement NO. 90-23, "Repair and Rehabilitation Research for Seismic Resistance of Structures." The need to strengthen existing buildings with inadequate seismic resistance is an urgent problem in the field of earthquake engineering. A major class of existing structures identified as posing one of the greatest seismic hazards are nonductile concrete frames. A number of strengthening techniques for concrete frames include addition of structural walls, addition of steel bracing, and enlarging of columns and beams using reinforced concrete jackets. An alternative approach to concrete jackets is the use of external steel jackets and plates attached to the existing members. Steel jackets may offer significant advantages of reduced labor, reduced cost, and reduced disruption to existing facilities, as compared to the use of concrete jackets. The proposed research program will investigate critical issues associated with the use of external steel jackets and plates for strengthening nonductile concrete frames. The project consists of a number of interrelated tests, divided into three major phases: I - behavior of steel-to-concrete connections; II - behavior of individual members strengthened with steel jackets; and III - behavior of beam-column subassemblages strengthened with steel jackets. The overall objective of the project is to develop design guidelines for the effective implementation of steel jackets as a strengthening and repair technique. This project is one part of a collaborative research activity involving an academic institution and two professional engineering offices in a common effort to implement research results into practice.

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