Development of a Sequential Kinking Terminal for W-beam Guardrails PDF Download
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Author: Dean Sicking
Publisher:
ISBN:
Category : Roads
Languages : en
Pages : 12
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Author: Dean Sicking
Publisher:
ISBN:
Category : Roads
Languages : en
Pages : 12
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Book Description
Author: Asif Bashir Qureshy
Publisher:
ISBN:
Category : Roads
Languages : en
Pages : 366
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Author:
Publisher:
ISBN:
Category : Air travel
Languages : en
Pages : 548
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Author: Bob W. Bielenberg
Publisher:
ISBN:
Category : Median strips
Languages : en
Pages : 256
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Author: Brian G. Pfeifer
Publisher:
ISBN:
Category : Roads
Languages : en
Pages : 40
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Author: Bob W. Bielenberg
Publisher:
ISBN:
Category : Median strips
Languages : en
Pages : 134
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Book Description
The research study consisted of Phase II of the development and full-scale vehicle crash testing of a bullnose barrier concept for the treatment of median hazards. The bullnose guardrail consisted of a 12-gauge thrie beam rail supported by twenty-two wood posts, eleven posts on each side of the system. Horizontal slots were cut in the valleys of selected thrie beam sections to aid in vehicle capture as well as to reduce the buckling and bending capacities of the rail. Two full-scale crash tests were performed, both using a 2000-kg pickup truck. The first crash test, impacting at a speed of 100.2 km/h and an angle of 0 degrees, was unsuccessful following the rupture of the thrie beam and subsequent uncontrolled penetration of the vehicle behind the barrier. Computer simulation of the failed test was performed using LS-DYNA. Analysis of the simulation and full-scale test results led to the addition of two steel cables placed behind the top and middle humps of the thrie beam nose section to aid in truck containment without stiffening the barrier. Computer simulation of the modified design demonstrated successful containment of the pickup truck. The second test, impacting at a speed of 103.5 km/h and an angle of 0 degrees was determined to be successful according to the safety standards set forth by the Test Level 3 (TL-3) evaluation criteria described in the NCHRP Report No. 350, "Recommended Procedures for the Safety Performance Evaluation of Highway Features" (1993). The next phase of the bullnose barrier system design will be to complete the remaining crash tests needed for compliance with the NCHRP Report No. 350 safety standards for median barriers.
Author: B. G. Pfeifer
Publisher:
ISBN:
Category : Roads
Languages : en
Pages : 0
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The Breakaway Cable Terminal (BCT), which has been used for a number of years to terminate w-beam guardrail in Kansas and a number of other states, does not always perform adequately when impacted by small vehicles. As a result of this poor performance, it has recently been disallowed by the FHWA for use on high speed, high volume roads on the National Highway System. The Kansas Department of Transportation (KDOT), and other states, felt that there was a need for a non-proprietary end terinal which met the current crash test standards of Test Level 3 of NCHRP Report 350. In this test, computer simulation and component testing was undertaken to evaluate the concept of flattening areas of the rail used in the terminal in order to reduce the force required to buckle the rail. Several dynamic bogie tests as well as one full-scale test were conducted. The design selected for evaluation under full scale crash test conditions consisted of a thrie beam flattened at two locations. The thrie beam was selected for testing because it had the best potential for successfully redirecting a pickup at 100 km/h and 20 degrees, as required by the new NCHRP Report 350 test criteria. Although the full-scale vehicle crash test failed to meet the required criteria, it was determined that this concept had the potential for success.
Author:
Publisher:
ISBN:
Category : Roads
Languages : en
Pages : 204
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This research study consisted of the development and testing of a short-radius guardrail system for protection of hazards near intersecting roadways and capable of meeting the Test Level 3 (TL-3) impact conditions of the NCHRP Report No. 350 criteria. A short-radius system was designed and consisted of a curved and slotted thrie beam nose section with two adjacent slotted thrie beam sections supported by breakaway posts. One side of the system was attached to a TL-3 steel post transition while the other was attached to a TL-2 end terminal. A series of four full-scale crash tests were conducted on the short-radius guardrail system.
Author: Jordan T. Wipf
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Guardrail end terminals are often used to shield approach ends of roadside guardrail systems as well as protect errant motorists from the risk of rail penetration through the vehicle and/or rapid deceleration. Energy-absorbing end terminals absorb an errant vehicle’s kinetic energy through rail deformation, or other means, in order to safely decelerate the vehicle in a controlled manner. Most modern energy-absorbing terminals are proprietary, and few terminals have passed the safety evaluation criteria published in the American Association of State Highway and Transportation Officials (AASHTO’s) Manual for Assessing Safety Hardware (MASH) in order to be installed with the Midwest Guardrail System (MGS). State Departments of Transportation (DOTs) are faced with a need to install energy-absorbing, guardrail end terminals that meet current MASH impact safety criteria. Thus, the Midwest Pooled Fund Program member states deemed it desirable to develop a new generic energy-absorbing guardrail end terminal. Thus, this Phase I study was conducted to perform preliminary analysis and design of a preferred concept or prototype. This initial effort included an investigation of patents and Federal Highway Administration (FHWA) eligibility letters to identify energy-absorbing terminals and their energy-absorption methods. Next, brainstorming was conducted to identify methods that could be used in a new terminal, after which preliminary design calculations and drawings were completed. Thereafter, several project paths and preliminary concepts were presented to the sponsor, followed by additional calculations and brainstorming. The final terminal prototype and its geometry was investigated and designed using results obtained through computer simulation using 3-D nonlinear finite element analysis software, LS-DYNA. This analysis included simulated impacts with end terminal hardware translating down a W-beam guardrail segment. A complete prototype drawing set was produced and submitted to local fabricators to obtain a cost quote, which revealed that the prototype was too complicated to fabricate and more expensive than desired. Finally, additional brainstorming and design refinement was performed using LS-DYNA, which was directed to simplify fabrication, reduce end terminal cost, and decrease the resistance force during translation along the rail. Conclusions were drawn, and recommendations were presented for continuing this work in a second phase..
Author: Dean Sicking
Publisher:
ISBN:
Category : Roads
Languages : en
Pages : 262
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Book Description
