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Evaluation of concrete barrier as ro...

Musa, Abdisa.

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Evaluation of concrete barrier as rockfall protection.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Evaluation of concrete barrier as rockfall protection./
作者:	Musa, Abdisa.
面頁冊數:	198 p.
附註:	Source: Dissertation Abstracts International, Volume: 76-11(E), Section: B.
Contained By:	Dissertation Abstracts International76-11B(E).
標題:	Civil engineering. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3710327
ISBN:	9781321861853

Evaluation of concrete barrier as rockfall protection.
Musa, Abdisa.

Evaluation of concrete barrier as rockfall protection. - 198 p.

Source: Dissertation Abstracts International, Volume: 76-11(E), Section: B.

Thesis (Ph.D.)--The University of Akron, 2015.

Rockfall is the movement of rocks down a slope which may be in the form of freefall, bouncing, rolling and sliding based on characteristics of slopes and nature of rocks. When rockfalls reach the roadway, they are hazardous to roadway users. Modified traffic concrete barriers that are standardized via crash test from the roadside as per National Cooperative Highway Research Program (NCHRP) Report 350 Test Level 3 (TL-3) criteria are commonly used by Ohio Department of Transportation (ODOT) to protect highways from rockfall hazards. The two most commonly used concrete barriers by ODOT are 32 inch high precast concrete barriers (PCB) and 42 inch high modified cast in place concrete barriers (CIP). The impact energy absorption limits and containment effectiveness of these barriers are relatively unknown and there is little knowledge of the efficiency of these barriers against rockfall. The objectives of this dissertation is to define the impact energy absorption limit and efficiency of these barriers against rockfall as well as the development of the new designs of concrete barriers for future applications.

ISBN: 9781321861853Subjects--Topical Terms:

860360
Civil engineering.

Evaluation of concrete barrier as rockfall protection.
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245 1 0 $a Evaluation of concrete barrier as rockfall protection.
300 $a 198 p.
500 $a Source: Dissertation Abstracts International, Volume: 76-11(E), Section: B.
500 $a Adviser: Anil Patnaik.
502 $a Thesis (Ph.D.)--The University of Akron, 2015.
520 $a Rockfall is the movement of rocks down a slope which may be in the form of freefall, bouncing, rolling and sliding based on characteristics of slopes and nature of rocks. When rockfalls reach the roadway, they are hazardous to roadway users. Modified traffic concrete barriers that are standardized via crash test from the roadside as per National Cooperative Highway Research Program (NCHRP) Report 350 Test Level 3 (TL-3) criteria are commonly used by Ohio Department of Transportation (ODOT) to protect highways from rockfall hazards. The two most commonly used concrete barriers by ODOT are 32 inch high precast concrete barriers (PCB) and 42 inch high modified cast in place concrete barriers (CIP). The impact energy absorption limits and containment effectiveness of these barriers are relatively unknown and there is little knowledge of the efficiency of these barriers against rockfall. The objectives of this dissertation is to define the impact energy absorption limit and efficiency of these barriers against rockfall as well as the development of the new designs of concrete barriers for future applications.
520 $a Two phases of impact tests were conducted in the field with Test Rocks of reinforced concrete, steel balls and natural stone. Phase 1 impact testing was designed for a maximum impact energy of 70 kJ on test barriers. Phase 2 impact testing was designed based on results from Phase 1 for the new designs of concrete barriers (PCB and CIP) with an impact energy of more than 180 kJ. The revised designs for new concrete barriers include the use of smaller size reinforcing bars and spacing, steel/polypropylene fibers, use of welded wire fabrics (WWF) and black reinforcing bars without epoxy coating. The results from Phase 1 impact testing indicated that current ODOT standard PCBs has a limit of an energy absorption capacity of 24 kJ under single impact and the capacity is much lower under multiple impacts. The modified traffic CIP concrete barriers has the maximum energy absorption capacity of 56 kJ under single impacts. During Phase 2 impact testing, the revised designs of PCBs with addition of fibers has the impact energy absorption limit of 45 kJ and reduced cracks patterns were observed. The maximum energy absorptions of the CIP concrete barriers with revised designs were observed to be as high as 156 kJ. The used of fibers increased the energy absorption capacities and also reduced the crack patterns in the concrete barriers. The use of steel fibers in the wet concrete increased the energy absorption capacity by around 40% and the polypropylene fibers increased the energy absorption capacity by 20%. The epoxy coating on the surface of the reinforcing bars reduced the bond to the surrounding concrete and increased the spalling of the concrete. The finite element modeling for the displacements and the strains were validated with high speed video of field data analyzed by ARAMIS.
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650 4 $a Civil engineering. $3 860360
650 4 $a Geological engineering. $3 2122713
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710 2 $a The University of Akron. $b Civil Engineering. $3 3181459
773 0 $t Dissertation Abstracts International $g 76-11B(E).
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791 $a Ph.D.
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793 $a English
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