Condition assessment of existing bridge structures

Ellingwood, Bruce R.; Zureick, Abdul-Hamid; Wang, Naiyu; O’Malley, Curtis

Title:

Condition assessment of existing bridge structures

dc.contributor.author	Ellingwood, Bruce R.
dc.contributor.author	Zureick, Abdul-Hamid
dc.contributor.author	Wang, Naiyu
dc.contributor.author	O’Malley, Curtis
dc.contributor.corporatename	Georgia Institute of Technology. Office of Sponsored Programs	en_US
dc.contributor.corporatename	Georgia Institute of Technology. School of Civil and Environmental Engineering	en_US
dc.date.accessioned	2016-11-10T20:28:16Z
dc.date.available	2016-11-10T20:28:16Z
dc.date.issued	2009-08-01
dc.description	Issued as final report	en_US
dc.description	GTRC Project No. E-20-K90 ; GDOT Project No. RP05 – 01
dc.description.abstract	Condition assessment and safety verification of existing bridges and decisions as to whether posting is required currently are addressed through analysis, load testing, or a combination of these methods. Structural analysis-based rating is by far the most common method for rating existing bridges. Load testing may be indicated when the analysis produces an unsatisfactory result or cannot be completed due to a lack of design documentation, information, or the presence of deterioration. The current rating process is described in the American Association of State Highway and Transportation Officials (AASHTO) Manual for Bridge Evaluation (MBE), First Edition (2008). This recently published Manual permits ratings to be determined through either allowable stress (ASR) or load factor (LFR) methods (Section 6B), or the load and resistance factor (LRFR) method (Section 6A). The LRFR method is keyed to the AASHTO LRFD Bridge Design Specifications, Fourth Edition (2007) which has been required for the design of new bridges since October, 2007. The State of Georgia currently utilizes the LFR method, which was permitted under the Manual for Condition Evaluation of Bridges, Second Edition. These three rating methods which continue to be commonly used – ASR, LRF, LRFR - may lead to different rated capacities and posted limits for the same bridge, a situation that has serious implications with regard to public safety and the economic well-being of communities that may be affected by bridge postings or closures. To address this issue, the Georgia Institute of Technology has conducted a research program, sponsored by the Georgia Department of Transportation, to develop improvements to the process by which the condition of existing bridge structures in the State of Georgia is assessed. The product of this research program is the Recommended Guidelines for Condition Assessment and Evaluation of Existing Bridges in Georgia. These guidelines address condition assessment and capacity evaluation by analysis, load test, or a combination of the two methods, depending on the circumstances and preferences of the GDOT. Part I of this report summarizes the technical approach taken to develop the Recommended Guidelines. Part II presents the Recommended Guidelines. An Appendix to Part II illustrates their use in typical rating situations.	en_US
dc.description.sponsorship	Georgia. Department of Transportation	en_US
dc.identifier.uri	http://hdl.handle.net/1853/56014
dc.language.iso	en_US	en_US
dc.publisher	Georgia Institute of Technology	en_US
dc.relation.ispartofseries	School of Civil and Environmental Engineering ; Project no. 100795	en_US
dc.subject	Bridges	en_US
dc.subject	Concrete	en_US
dc.subject	Condition assessment	en_US
dc.subject	Loads	en_US
dc.subject	Probability	en_US
dc.subject	Reliability	en_US
dc.subject	Steel	en_US
dc.subject	Structural engineering	en_US
dc.title	Condition assessment of existing bridge structures	en_US
dc.title.alternative	Report of task 4 – Development of guidelines for condition assessment, evaluation and rating of bridges in Georgia
dc.type	Text
dc.type.genre	Technical Report
dspace.entity.type	Publication
local.contributor.author	Zureick, Abdul-Hamid
local.contributor.corporatename	School of Civil and Environmental Engineering
local.contributor.corporatename	College of Engineering
local.contributor.corporatename	Office of Sponsored Programs
local.relation.ispartofseries	OSP Final Research Reports
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