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OTREC-RR-10-17 By Peter Dusicka
eBook (PDF): $0.00
This study examines retrofitting bridge brace elements with fiber reinforced composites to provide restraint against buckling. The composites are fiber reinforced polymer (FRP) composite pultruded... More > sections and wet lay-up wraps. Prototype specimens were tested using reverse cyclic loading, and their performance was characterized by their compressive strength and their overall hysteretic behavior. This exploratory study shows that retrofitting slender bracing members with FRP sections improves performance. All retrofitted specimens show improved compressive strength in the linear elastic and plastic deformation range of the slender bracing member. The cyclic behavior had only a marginal improvement due to failure at the bolted brace connections. Brace modification marginally improved cyclic performance. Despite the challenges of connection failures, applying fiber reinforced composites has a potential to restrain buckling of slender bracing members and to improve compressive resistance.< Less
OTREC-RR-10-17 By Peter Dusicka
Paperback: $6.35
Prints in 3-5 business days
This study examines retrofitting bridge brace elements with fiber reinforced composites to provide restraint against buckling. The composites are fiber reinforced polymer (FRP) composite pultruded... More > sections and wet lay-up wraps. Prototype specimens were tested using reverse cyclic loading, and their performance was characterized by their compressive strength and their overall hysteretic behavior. This exploratory study shows that retrofitting slender bracing members with FRP sections improves performance. All retrofitted specimens show improved compressive strength in the linear elastic and plastic deformation range of the slender bracing member. The cyclic behavior had only a marginal improvement due to failure at the bolted brace connections. Brace modification marginally improved cyclic performance. Despite the challenges of connection failures, applying fiber reinforced composites has a potential to restrain buckling of slender bracing members and to improve compressive resistance.< Less
OTREC-RR-11-22 By Peter Dusicka & Selamawit T Mehary
Paperback: $5.48
Prints in 3-5 business days
This project developed a seismic model for Oregon truck routes using Risk for Earthquake Damage to Roadway Systems (REDARS2) and HAZUS-MH. We refined data from the first model to more realistically... More > represent bridge inventory, address the seismicity of the Pacific Northwest (PNW), conduct sensitivity analyses of soil data and develop a seismic network model of Oregon bridges to assess roadway vulnerability. Assumptions were reviewed and Oregon data was incorporated to replace defaults for economic loss. The largest probable PNW earthquake is a subduction zone earthquake. A shortcoming of REDARS2 is its inability to incorporate subduction zone attenuation. USGS shakemaps for Cascadia subduction zone events are incorporated to add that capability. Analyses of the network incorporating bridges and post processing of the data with input from Oregon DOT engineers resulted in recommendations for bridge route priorities. More data and cost-benefit analyses are needed for final retrofit decisions.< Less
OTREC-RR-11-08 By Peter Dusicka & Jeff Roberts
eBook (PDF): $0.00
Frequently traveled roads in Oregon are in seismically active areas. Many of our bridges were designed and built to lateral demands that were assumed to be less than the current expectation, due to... More > improved awareness of seismic hazard and enhanced understanding of the non-linear response of bridges. This vulnerability to earthquakes can result in not only immediate damage, but also in the potentially lingering economic impact of disrupted traffic and freight. Fragility curves were constructed assuming lognormal capacity and demand distributions. Probability of failure was determined for slight, moderate, extensive, and complete damage. Statistical values were compared to the median and dispersion values proposed by other researchers, and calculated using guidelines from the HAZUS Technical Manual. Older multiple-span bridges were found to be significantly more fragile than the models. Through this modeling and analysis, the relative fragility of the modeled typical 3-span and 5-span bridges was determined.< Less
OTREC-RR-11-08 By Peter Dusicka & Jeff Roberts
Paperback: $5.41
Prints in 3-5 business days
Frequently traveled roads in Oregon are in seismically active areas. Many of our bridges were designed and built to lateral demands that were assumed to be less than the current expectation, due to... More > improved awareness of seismic hazard and enhanced understanding of the non-linear response of bridges. This vulnerability to earthquakes can result in not only immediate damage, but also in the potentially lingering economic impact of disrupted traffic and freight. Fragility curves were constructed assuming lognormal capacity and demand distributions. Probability of failure was determined for slight, moderate, extensive, and complete damage. Statistical values were compared to the median and dispersion values proposed by other researchers, and calculated using guidelines from the HAZUS Technical Manual. Older multiple-span bridges were found to be significantly more fragile than the models. Through this modeling and analysis, the relative fragility of the modeled typical 3-span and 5-span bridges was determined.< Less
OTREC-TT-09-01 By Trevor D. Smith & Peter Dusicka
Paperback: $7.13
Prints in 3-5 business days
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OTREC-TT-09-01 By Trevor D. Smith & Peter Dusicka
eBook (PDF): $0.00
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OTREC-RR-12-03 By Peter Dusicka et al.
eBook (PDF): $0.00
Gusset plates connect individual steel truss bridge members together at a node. In 10% of the 200,000 steel bridges in US in 2008, failure of a single truss or connection could lead to collapse.... More > Regular inspection and load rating are essential for the safe operation and maintenance of these bridges. The Minneapolis I-35 Bridge collapse was the first gusset failure where a design flaw was implicated. Load rating gusset plates is a significant challenge given the number of connections and the complexity of accurately evaluating each one. The majority of research on gusset plate strength is from small-scale connections. More refined techniques are needed to conduct high-fidelity capacity evaluations. Finite element analysis (FEA) is widely used in structural engineering. Using FEA in gusset plate evaluation presents challenges due to the connections’ large-scale, high degree of geometric variability and complex load paths.< Less
OTREC-RR-12-03 By Peter Dusicka et al.
Paperback: $6.28
Prints in 3-5 business days
Gusset plates connect individual steel truss bridge members together at a node. In 10% of the 200,000 steel bridges in US in 2008, failure of a single truss or connection could lead to collapse.... More > Regular inspection and load rating are essential for the safe operation and maintenance of these bridges. The Minneapolis I-35 Bridge collapse was the first gusset failure where a design flaw was implicated. Load rating gusset plates is a significant challenge given the number of connections and the complexity of accurately evaluating each one. The majority of research on gusset plate strength is from small-scale connections. More refined techniques are needed to conduct high-fidelity capacity evaluations. Finite element analysis (FEA) is widely used in structural engineering. Using FEA in gusset plate evaluation presents challenges due to the connections’ large-scale, high degree of geometric variability and complex load paths.< Less

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Our World Our World By Deleah Payne
Paperback: $21.60