Development Of A Transition Between Free Standing And Reduced Deflection Portable Concrete Barriers Phase I

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Development Of A Transition Between Free Standing And Reduced Deflection Portable Concrete Barriers Phase I

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Author : Mojdeh Asadollahi Pajouh
language : en
Publisher:
Release Date : 2017

Development Of A Transition Between Free Standing And Reduced Deflection Portable Concrete Barriers Phase I written by Mojdeh Asadollahi Pajouh and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with Roads categories.

Conference Papers Index

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Author :
language : en
Publisher:
Release Date : 1987

Conference Papers Index written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987 with Electronic journals categories.

Monthly. Papers presented at recent meeting held all over the world by scientific, technical, engineering and medical groups. Sources are meeting programs and abstract publications, as well as questionnaires. Arranged under 17 subject sections, 7 of direct interest to the life scientist. Full programs of meetings listed under sections. Entry gives citation number, paper title, name, mailing address, and any ordering number assigned. Quarterly and annual indexes to subjects, authors, and programs (not available in monthly issues).

Development Of A Retrofit Low Deflection Temporary Concrete Barrier System

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Author : Robert W. Bielenberg
language : en
Publisher:
Release Date : 2014

Development Of A Retrofit Low Deflection Temporary Concrete Barrier System written by Robert W. Bielenberg and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with Roads categories.

Development Of Low Deflection Precast Concrete Barrier

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Author :
language : en
Publisher:
Release Date : 2004

Development Of Low Deflection Precast Concrete Barrier written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with Concrete construction categories.

Development Of A Non Pinned Low Profile End Treatment

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Author : Felicia Jean Desorcie
language : en
Publisher:
Release Date : 2014

Development Of A Non Pinned Low Profile End Treatment written by Felicia Jean Desorcie and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.

In the early 1990s, the Low-Profile Portable Concrete Barrier (PCB) system, including both the sloped Low-Profile PCB segment and Low-Profile PCB end treatment, were developed. The original Low-Profile PCB end treatment was designed with steel pins inserted along the barrier centerline, through precast holes, and anchored to the pavement or subgrade. The purpose of these pins was to reduce lateral deflection of the end treatment during an impact. For various reasons, users of the Low-Profile PCB system have stated that the system would be more easily deployed if the vertical pins were not used in situations where lateral deflections can be permitted. The primary objective of the research presented herein was to determine the feasibility of removing the vertical, steel pins from the Low-Profile PCB end treatment in certain applications and if necessary make modifications. The secondary objective of the research presented herein was to demonstrate the applicability of the finite element analysis (FEA) to unpinned barrier systems. The research objectives were achieved through the use of sound engineering judgment, FEA, and a full-scale crash test. Based on sound engineering judgment and approximate strength analyses of the original Low-Profile PCB design, the author determined the system would most likely function acceptably but would have large lateral deflections. In order to increase connection rigidity and thus control lateral displacement, a plate washer was added to the barrier connection. The modified non-pinned Low-Profile PCB system was tested for strength in a full-scale crash test under Manual for Assessing Safety Hardware (MASH) test 2-35. Additionally, the recommended system was analyzed under similar test conditions with LS-DYNA, a finite element code. The recommended system passed the MASH test 2-35, in both a full-scale crash test and FEA. While this does not replace the original barrier, it does provide another option for use of the Low-Profile PCB in situations where sufficient room for deflection outside of the length of need exists. If this room does not exist, the barrier must remain pinned. The electronic version of this dissertation is accessible from http://hdl.handle.net/1969.1/151825

Development Of A Transition Between An Energy Absorbing Concrete Barrier And A Rigid Concrete Buttress

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Author : Tyler L. Schmidt
language : en
Publisher:
Release Date : 2016

Development Of A Transition Between An Energy Absorbing Concrete Barrier And A Rigid Concrete Buttress written by Tyler L. Schmidt and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.

From 2010 to 2015, MwRSF researchers developed the RESTORE barrier, which is a restorable MASH TL-4 median barrier with a steel and concrete rail supported by elastomer posts and steel skids. The research effort reported herein describes the initial development of a transition from the RESTORE barrier to a rigid TL-4 concrete buttress. The previously-developed RESTORE barrier LS-DYNA model was validated against three full-scale vehicle crash tests. Several design concepts were generated through a series of brainstorming efforts. The primary transition concept consisted of a pin and loop connection between the RESTORE barrier and rigid concrete buttress, which was designed and evaluated with LS-DYNA computer simulation. Vehicle and system behavior were investigated using MASH test designation nos. 4-20, 4-21, and 4-22. Six horizontal gusset plates and drop-down pin allowed for limited deflection and rotation at the transition joint, but provided shear continuity between the two systems. A rounded-edge cover plate mitigated vehicle snag on the transition joint hardware. Eleven impact points were evaluated with each vehicle model to determine critical impact points for use in a future full-scale crash testing program. All occupant risk measures and vehicle stability were within MASH limits. Further design modifications are recommended to limit stresses in the transition joint hardware and to reduce excessive occupant compartment deformation that occurred when the small car impacted the concrete buttress end.

Development Of A Transition Between An Energy Absorbing Concrete Barrier And A Rigid Concrete Buttress

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Author : Tyler L. Schmidt
language : en
Publisher:
Release Date : 2016

Development Of A Transition Between An Energy Absorbing Concrete Barrier And A Rigid Concrete Buttress written by Tyler L. Schmidt and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with Roads categories.

"From 2010 to 2015, [Midwest Roadside Safety Facility] MwRSF researchers developed the RESTORE barrier, which is a restorable MASH TL-4 median barrier with a steel and concrete rail supported by elastomer posts and steel skids. The research effort reported herein describes the initial development of a transition from the RESTORE barrier to a rigid TL-4 concrete buttress. The previously-developed RESTORE barrier LS-DYNA model was validated against three full-scale vehicle crash tests. Several design concepts were generated through a series of brainstorming efforts. The primary transition concept consisted of a pin and loop connection between the RESTORE barrier and rigid concrete buttress, which was designed and evaluated with LS-DYNA computer simulation. Vehicle and system behavior were investigated using MASH test designation nos. 4-20, 4-21, and 4-22. Six horizontal gusset plates and drop-down pin allowed for limited deflection and rotation at the transition joint, but provided shear continuity between the two systems. A rounded-edge cover plate mitigated vehicle snag on the transition joint hardware. Eleven impact points were evaluated with each vehicle model to determine critical impact points for use in a future full-scale crash testing program. All occupant risk measures and vehicle stability were within MASH limits. Further design modifications are recommended to limit stresses in the transition joint hardware and to reduce excessive occupant compartment deformation that occurred when the small car impacted the concrete buttress end" (page. i).

Development Of A Low Profile To F Shape Transition Barrier Segment

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Author :
language : en
Publisher:
Release Date : 2007

Development Of A Low Profile To F Shape Transition Barrier Segment written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with Roads categories.

The purpose of the research reported herein was to develop a transition barrier segment that can be used to connect the low-profile barrier (LPCB(1)-92) to the standard height, F-shape portable concrete barrier (CSB-04). The design of the new transition barrier segment is such that no new hardware is required to connect the transition barrier segment to the low-profile barrier and the F-shape barrier. Researchers used computer simulations to evaluate the proposed design and to examine the location of critical impact points that were used in specifying impact conditions for a full-scale evaluation of the new design. Results of two full-scale tests coupled with results from the computer simulations show that the new transition barrier segment is ready for immediate implementation.

Development Of A Next Generation Non Proprietary Portable Concrete Barrier

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Author : Riley J. Ruskamp
language : en
Publisher:
Release Date : 2022

Development Of A Next Generation Non Proprietary Portable Concrete Barrier written by Riley J. Ruskamp and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022 with categories.

Portable concrete barriers (PCBs) are segmented barriers made of precast concrete units that are connected by various load-bearing hardware. PCBs are typically used to shield work zones by redirecting errant vehicles upon impact with the barrier system. Most commonly-available PCBs have demonstrated performance issues arising from the sloped face of the barrier, which encourages vehicles to pitch and roll during impact, potentially resulting in vehicle rollover. Concerns also exist regarding the large dynamic deflections exhibited by these systems that can encroach upon the protected work zone or require anchoring to prevent large displacements. In addition to these concerns, the American Association of State Highway and Transportation Officials (AASHTO) updated the Manual for Assessing Safety Hardware (MASH) in 2016, which improved the criteria for evaluating roadside safety devices and required the re-evaluation of barrier systems developed before the updated standards were published. Thus, an opportunity existed to develop a next-generation PCB system capable of meeting the new MASH 2016 criteria while addressing the concerns of the current generation of PCBs. The objective of this research effort funded by the Mid-America Transportation Center (MATC) was to further develop and investigate PCB concept designs that were brainstormed under a parallel research effort at the Midwest Roadside Safety Facility (MwRSF) funded by the Wisconsin Department of Transportation. This research consisted of the development of finite element models of the PCB design concepts for use in LS-DYNA simulations, followed by the comparison of the simulation results to a current PCB system that has been previously modeled and validated. The simulation analysis identified three PCB concepts as viable designs, while three other PCB concepts were not recommended based on the simulation performance. Upon completion of the simulation analysis, the simulation results of the six PCB concepts were presented to Midwest Pooled Fund Program member states. Finally, a single concept, that used interlocking and staggered precast concrete segments without the need for connection hardware, was selected for further design and full-scale crash testing in the next phase of the research.

Evaluation Of Concrete Barrier As Rockfall Protection

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Author : Abdisa Musa
language : en
Publisher:
Release Date : 2015

Evaluation Of Concrete Barrier As Rockfall Protection written by Abdisa Musa and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with Civil engineering categories.

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.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.