Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Development of a Tie-Down System for Temporary Concrete Barriers
During construction of highways and bridges, it is common for temporary concrete barriers to be installs near the edge of a roadway or bridge deck during construction. Free-standing temporary barriers placed close to the bridge deck edge pose a safety hazard to errant vehicle as there is a significant risk for the barrier to be propelled off the bridge. Previous testing of temporary barriers have shown deflections of more than one meter. These large dynamic deflections, in combination with a narrow gap located behind the barriers, would prove significant to push the barriers as well as the impacting vehicle off of the bridge deck. In 1998, researchers at the Midwest Roadside Safety Facility (MwRSF) at the University of Nebraska-Lincoln (UNL) were approached to develop a tie-down system for this type of installation. This report details the development and testing of an NCHRP 350-compliant tie-down system for use with F-shape temporary concrete barriers. Development of the tie-down system began with the creation and evaluation of several design concepts. Following the researchers' evaluation of the design prototypes, the steel strap tie-down concept was selected for further study. This concept consisted of a steel strap that connected to the barrier joints and then bolted to the concrete bridge deck. The steel strap tie-down was analyzed and redesigned using LS-DYNA finite element computer simulation modeling. The strap tie-down is comprised of a 76-mm x 6.4-mm x 914-mm piece of ASTM A36 steel bent into a trapezoidal shape. Holes are punched in the plate to allow the connecting pin at the barrier joints to pass through the strap as well as allow the strap to be anchored to the bridge deck at each end. Anchoring of the strap to the bridge deck is done using two of 19-mm diameter drop-in anchors for each strap. The steel strap tie-down was bogie tested to evaluate its performance.
Development of a Tie-Down System for Temporary Concrete Barriers
During construction of highways and bridges, it is common for temporary concrete barriers to be installs near the edge of a roadway or bridge deck during construction. Free-standing temporary barriers placed close to the bridge deck edge pose a safety hazard to errant vehicle as there is a significant risk for the barrier to be propelled off the bridge. Previous testing of temporary barriers have shown deflections of more than one meter. These large dynamic deflections, in combination with a narrow gap located behind the barriers, would prove significant to push the barriers as well as the impacting vehicle off of the bridge deck. In 1998, researchers at the Midwest Roadside Safety Facility (MwRSF) at the University of Nebraska-Lincoln (UNL) were approached to develop a tie-down system for this type of installation. This report details the development and testing of an NCHRP 350-compliant tie-down system for use with F-shape temporary concrete barriers. Development of the tie-down system began with the creation and evaluation of several design concepts. Following the researchers' evaluation of the design prototypes, the steel strap tie-down concept was selected for further study. This concept consisted of a steel strap that connected to the barrier joints and then bolted to the concrete bridge deck. The steel strap tie-down was analyzed and redesigned using LS-DYNA finite element computer simulation modeling. The strap tie-down is comprised of a 76-mm x 6.4-mm x 914-mm piece of ASTM A36 steel bent into a trapezoidal shape. Holes are punched in the plate to allow the connecting pin at the barrier joints to pass through the strap as well as allow the strap to be anchored to the bridge deck at each end. Anchoring of the strap to the bridge deck is done using two of 19-mm diameter drop-in anchors for each strap. The steel strap tie-down was bogie tested to evaluate its performance.
Development of a Tie-Down System for Temporary Concrete Barriers
B. W. Bielenberg (Autor:in) / R. K. Faller (Autor:in) / J. D. Reid (Autor:in) / J. C. Holloway (Autor:in) / J. R. Rohde (Autor:in)
2002
152 pages
Report
Keine Angabe
Englisch
Construction Equipment, Materials, & Supplies , Highway Engineering , Concrete barriers , Temporary barriers , Development , Recommendations , Test conditions , Highway safety , Crash tests , Work zones , Longitudinal barriers , Construction , Literature review , Test requirements , Evaluation criteria , Tie-down straps
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