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001 ocn894047398;

003 OCoLC;

005 20141212080039.0;

008 141030s2011 ncua b s000 0 eng d;

035 a| (Sirsi) o894047398;

035 a| (OCoLC)894047398;

040 a| EREc| EREd| EREd| UtOrBLW;

049 a| EREN;

090 a| TA683.5b| .R59 2011;

100 1 a| Rizkalla, S. H.=| ^A720803;

245 10 a| Predicting camber, deflection, and prestress losses in prestressed concrete members /c| prepared by Sami Rizkalla, Paul Zia, [and] Tyler Storm (North Carolina State University, Centennial Campus, Constructed Facilities Laboratory).;

260 a| [Raleigh, N.C.] :b| [North Carolina State University],c| [2011];

300 a| xxi, 153 pages :b| illustrations ;c| 28 cm;

336 a| text2| rdacontent;

337 a| unmediated2| rdamedia;

338 a| volume2| rdacarrier;

513 a| Final report;b| 8/16/2009-3/31/2011.;

536 a| Prepared for North Carolina Dept. of Transportation, Research and Analysis Group;f| Research project #2010-05;

500 a| "July 2011.";

530 a| Also available online.;

520 3 a| Accurate predictions of camber and prestress losses for prestressed concrete bridge girders are essential to minimizing the frequency and cost of construction problems. The time-dependent nature of prestress losses, variable concrete properties, and problems related to production variables make it difficult to predict camber accurately. The recent problems experienced by NCDOT during construction are mainly related to inaccurate prediction of camber. In this report, several factors related to girder production are shown to have a significant impact on the prediction of camber. A detailed method and an approximate method for predicting camber that both utilize adjustments to account for the production factors are proposed. The detailed method uses time-dependent losses calculations and creep factors to predict camber, while the approximate method uses multipliers. The current NCDOT method and the proposed methods are analyzed and compared using an extensive database of field measurements. The proposed methods are shown to provide significant improvements to the camber predictions in comparison to the current NCDOT method. Recommendations for design and production practices are provided.;

504 a| Includes bibliographical references (p. 93-94).;

650 0 a| Prestressed concrete beamsx| Design and construction.=| ^A76335;

650 0 a| Prestressed concrete bridgesz| North Carolinax| Design and construction.=| ^A1234309;

650 7 a| Curvature.2| trt;

650 7 a| Deflection.2| trt;

650 7 a| Prestressing.2| trt;

650 7 a| Girders.2| trt;

650 7 a| Prestressed concrete bridges.2| trt;

700 1 a| Zia, Paul,d| 1926-=| ^A21785;

700 1 a| Storm, Tyler,d| 1986-=| ^A1228211;

710 2 a| North Carolina State University.b| Constructed Facilities Laboratory.=| ^A1220165;

710 1 a| North Carolina.b| Department of Transportation.b| Research and Analysis Group.=| ^A531770;

856 41 u| http://ntl.bts.gov/lib/44000/44100/44153/2010-05finalreport.pdfz| Connect to resource online;

856 41 u| http://worldcat.org/oclc/785925373/viewonline3| View Online;

949 a| TA683.5 .R59 2011h| JOYNER89o| jdjr;

994 a| C0b| ERE;

596 a| 1;

998 a| 3658211;

999 a| TA683.5 .R59 2011w| LCc| 1i| 30372015574822d| 6/29/2016e| 11/21/2014f| 5/21/2024g| 2l| JNCSm| JOYNERr| Ys| Yt| JNCSBKu| 10/30/2014x| BOOKz| JNCCOLLo| .STAFF. jdjr;

Predicting camber, deflection, and prestress losses in prestressed concrete members / prepared by Sami Rizkalla, Paul Zia, [and] Tyler Storm (North Carolina State University, Centennial Campus, Constructed Facilities Laboratory).

Author/creator	Rizkalla, S. H.
Format	Book
Publication Info	[Raleigh, N.C.] : [North Carolina State University], [2011]
Description	xxi, 153 pages : illustrations ; 28 cm
Supplemental Content	Connect to resource online
Supplemental Content	View Online
Subjects	Prestressed concrete beams--Design and construction. Prestressed concrete bridges--North Carolina. --Design and construction.

Other author/creator	Zia, Paul, 1926-
Other author/creator	Storm, Tyler, 1986-
Other author/creator	North Carolina State University. Constructed Facilities Laboratory.
Other author/creator	North Carolina. Department of Transportation. Research and Analysis Group.
Summary	Accurate predictions of camber and prestress losses for prestressed concrete bridge girders are essential to minimizing the frequency and cost of construction problems. The time-dependent nature of prestress losses, variable concrete properties, and problems related to production variables make it difficult to predict camber accurately. The recent problems experienced by NCDOT during construction are mainly related to inaccurate prediction of camber. In this report, several factors related to girder production are shown to have a significant impact on the prediction of camber. A detailed method and an approximate method for predicting camber that both utilize adjustments to account for the production factors are proposed. The detailed method uses time-dependent losses calculations and creep factors to predict camber, while the approximate method uses multipliers. The current NCDOT method and the proposed methods are analyzed and compared using an extensive database of field measurements. The proposed methods are shown to provide significant improvements to the camber predictions in comparison to the current NCDOT method. Recommendations for design and production practices are provided.
General note	"July 2011."
Bibliography note	Includes bibliographical references (p. 93-94).
Report note	Final report; 8/16/2009-3/31/2011.
Other forms	Also available online.
Funding information	Prepared for North Carolina Dept. of Transportation, Research and Analysis Group; Research project #2010-05

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Library	Location	Call Number	Status	Item Actions
Joyner	NC Stacks	TA683.5 .R59 2011	✔ Available	Place Hold

Predicting camber, deflection, and prestress losses in prestressed concrete members / prepared by Sami Rizkalla, Paul Zia, [and] Tyler Storm (North Carolina State University, Centennial Campus, Constructed Facilities Laboratory).

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