國立虎尾科技大學 |

Application of Ultra-High Performance Concrete in Prefabricated Bridge Element Connections for Accelerated Bridge Construction.

Record Type:	Language materials, manuscript : Monograph/item
Title/Author:	Application of Ultra-High Performance Concrete in Prefabricated Bridge Element Connections for Accelerated Bridge Construction./
Author:	Bridi Valentim, Daniel.
Description:	1 online resource (250 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 84-12, Section: B.
Contained By:	Dissertations Abstracts International84-12B.
Subject:	Civil engineering. -
Online resource:	click for full text (PQDT)
ISBN:	9798379720377

Application of Ultra-High Performance Concrete in Prefabricated Bridge Element Connections for Accelerated Bridge Construction.
Bridi Valentim, Daniel.

Application of Ultra-High Performance Concrete in Prefabricated Bridge Element Connections for Accelerated Bridge Construction. - 1 online resource (250 pages)

Source: Dissertations Abstracts International, Volume: 84-12, Section: B.

Thesis (Ph.D.)--The University of Alabama, 2023.

Includes bibliographical references

A relatively new type of beam falling under the accelerated bridge construction (ABC) umbrella, the Northeast Extreme Tee (NEXT) D beam, was designed by the PCI Northeast Bridge Technical Committee, with connection details that substitute traditional welded ties joining butted-beam systems, such as bulb-tee girders and double-tee beams. Grout has traditionally been used in joints between prefabricated bridge elements and systems (PBES). This material, however, has resulted in issues with shear key cracking reported by the Federal Highway Administration. An alternative cementitious material, ultra-high performance concrete (UHPC), has been used as a great solution for connections between PBES in ABC. This material exhibits superior properties such as compressive, tensile, and bond strength, durability, and long-term stability when compared to conventional connection materials. Three main studies are presented herein. The first study presents a tensile strength evaluation of 54 UHPC specimens by comparing the direct tension (DT), four-point bending, and double-edge wedge-splitting (DEWS) test methods. No statistically significant difference was found between the peak tensile strengths obtained from DT and DEWS specimens. DEWS specimens are tested using a compression-testing machine, and can be cored and finished from existing UHPC members. The second study evaluates the bond-slip behavior of UHPC and untensioned prestressing strands. The variables studied in the 54 tested pull-out specimens include clear cover, embedment length, and strand diameter (dPT). It was observed that specimens that experienced strand failure had an embedment length of at least 24xdPT or clear cover distance of 2.17xdPT. The third study investigates the behavior of NEXT D beams under fatigue loading. Four double-tee and four slab specimens were subjected to 1 million cycles under AASHTO standard wheel truck loads. Moreover, finite element analyses (FEAs) were performed, effectively simulating the tested specimens, and a 60-ft. long bridge model was created to simulate a constructed bridge in Mobile County, Alabama. It was observed that an 8-in. (203-mm) wide UHPC joint with a single reinforcement layer containing straight #5 bars, an 8-in. (203-mm) embedment length, and spaced every 6 in. (152 mm) had satisfactory performance according to results from experimental testing and FEAs.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2024

Mode of access: World Wide Web

ISBN: 9798379720377Subjects--Topical Terms:

561339
Civil engineering.
Subjects--Index Terms:

ABCIndex Terms--Genre/Form:

554714
Electronic books.

Application of Ultra-High Performance Concrete in Prefabricated Bridge Element Connections for Accelerated Bridge Construction.
LDR:03825ntm a22004097 4500 001 1141704
005 20240414211451.5
006 m o d
007 cr mn ---uuuuu
008 250605s2023 xx obm 000 0 eng d
020 $a 9798379720377
035 $a (MiAaPQ)AAI30314926
035 $a AAI30314926
040 $a MiAaPQ $b eng $c MiAaPQ $d NTU
100 1 $a Bridi Valentim, Daniel. $3 1465648
245 1 0 $a Application of Ultra-High Performance Concrete in Prefabricated Bridge Element Connections for Accelerated Bridge Construction.
264 0 $c 2023
300 $a 1 online resource (250 pages)
336 $a text $b txt $2 rdacontent
337 $a computer $b c $2 rdamedia
338 $a online resource $b cr $2 rdacarrier
500 $a Source: Dissertations Abstracts International, Volume: 84-12, Section: B.
500 $a Advisor: Aaleti, Sriram;Kreger, Michael.
502 $a Thesis (Ph.D.)--The University of Alabama, 2023.
504 $a Includes bibliographical references
520 $a A relatively new type of beam falling under the accelerated bridge construction (ABC) umbrella, the Northeast Extreme Tee (NEXT) D beam, was designed by the PCI Northeast Bridge Technical Committee, with connection details that substitute traditional welded ties joining butted-beam systems, such as bulb-tee girders and double-tee beams. Grout has traditionally been used in joints between prefabricated bridge elements and systems (PBES). This material, however, has resulted in issues with shear key cracking reported by the Federal Highway Administration. An alternative cementitious material, ultra-high performance concrete (UHPC), has been used as a great solution for connections between PBES in ABC. This material exhibits superior properties such as compressive, tensile, and bond strength, durability, and long-term stability when compared to conventional connection materials. Three main studies are presented herein. The first study presents a tensile strength evaluation of 54 UHPC specimens by comparing the direct tension (DT), four-point bending, and double-edge wedge-splitting (DEWS) test methods. No statistically significant difference was found between the peak tensile strengths obtained from DT and DEWS specimens. DEWS specimens are tested using a compression-testing machine, and can be cored and finished from existing UHPC members. The second study evaluates the bond-slip behavior of UHPC and untensioned prestressing strands. The variables studied in the 54 tested pull-out specimens include clear cover, embedment length, and strand diameter (dPT). It was observed that specimens that experienced strand failure had an embedment length of at least 24xdPT or clear cover distance of 2.17xdPT. The third study investigates the behavior of NEXT D beams under fatigue loading. Four double-tee and four slab specimens were subjected to 1 million cycles under AASHTO standard wheel truck loads. Moreover, finite element analyses (FEAs) were performed, effectively simulating the tested specimens, and a 60-ft. long bridge model was created to simulate a constructed bridge in Mobile County, Alabama. It was observed that an 8-in. (203-mm) wide UHPC joint with a single reinforcement layer containing straight #5 bars, an 8-in. (203-mm) embedment length, and spaced every 6 in. (152 mm) had satisfactory performance according to results from experimental testing and FEAs.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2024
538 $a Mode of access: World Wide Web
650 4 $a Civil engineering. $3 561339
650 4 $a Materials science. $3 557839
650 4 $a Environmental engineering. $3 557376
653 $a ABC
653 $a Bridge elements
653 $a Prestressing
653 $a Strands
653 $a Tensile
653 $a UHPC
655 7 $a Electronic books. $2 local $3 554714
690 $a 0543
690 $a 0775
690 $a 0794
710 2 $a ProQuest Information and Learning Co. $3 1178819
710 2 $a The University of Alabama. $b Civil, Construction & Environmental Engineering. $3 1465649
773 0 $t Dissertations Abstracts International $g 84-12B.
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30314926 $z click for full text (PQDT)