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Prepared by the Highway Innovative Technology Evaluation Center (HITEC), a CERF Service Center. This report summarizes the results of a detailedØevaluation of Friction Pendulum Bearings,Ømanufactured by Earthquake Protection Systems, Inc. The report is part of a program to test the performance of 11 seismic isolators and dampers produced by several manufacturers. The devicesØwere tested for stability, response during earthquake simulations, and fatigue and weathering effects.
Presents the results of a detailed evaluation for one technology out of eleven that were evaluated. The evaluations were designed to test the performance of seismic isolators and dampers produced by several manufacturers.
This report, Evaluation Findings for Dynamic Isolation Systems Elastometric Bearings, presents the results of a detailed evaluation for one technology out of eleven that were evaluated in this program. The evaluations were designed to test the performance of seismic isolators and dampers produced by several manufactures.
Prepared by the Highway Innovative Technology Evaluation Center (HITEC), a CERF Service Center. his report summarizes the results of an evaluation that was designed to test the performance of 11 seismic isolators and dampers. The devices were tested for stability, response during earthquake simulations, and fatigue and weathering effects.
Prepared by the Highway Innovative Technology Evaluation Center (HITEC), a CERF service center. This report presents the results of a detailed evaluation ofØthe MX 30 pavement marking 30-meter retroreflectometer. The evaluation is designed to test the measurement bias, repeatability, and reproducibility of handheld and mobile retroreflectometers produced by several manufacturers.
Prepared by the Highway Innovative Technology Evaluation Center (HITEC), a CERF Service Center. This report summarizes the results of a detailedØevaluation of a viscous damper,Ømanufactured by Enidine, Inc. The report is part of a program to test the performance of 11 seismic isolators and dampers produced by several manufacturers. The devicesØwere tested for stability, response during earthquake simulations, and fatigue and weathering effects.
Prepared by the Highway Innovative Technology Evaluation Center (HITEC), a CERF Service Center. This report summarizes the results of a detailedØevaluation of high-damping rubber bearings,Ømanufactured by Scougal Rubber Corporation. The report is part of a program to test the performance of 11 seismic isolators and dampers produced by several manufacturers. The devicesØwere tested for stability, response during earthquake simulations, and fatigue and weathering effects.
Seismic isolation is effective in protecting both structural and non-structural elements during earthquakes. One of the most commonly used base-isolation systems is the friction pendulum system (FPS). It provides excellent re-centering and large energy dissipation capacities. Despite these benefits, FPSs are rarely used in the U.S. for several reasons. Out of many one may identify, the required peer review process and the conservativeness of the existing design guideline make the implementation of the technology somewhat less economically appealing. More critically, it is a well-known dilemma that FPS can only be designed to achieve optimal performance for one level of ground shaking. A possible answer to this challenge is to use "passive-adaptive" devices, including multiple friction pendulum systems and the recently proposed Variable Friction Systems (VFSs). While providing sufficient protection (usually life safety) during a maximum considered earthquake, these systems can still effectively isolate the structure during a service level earthquake, resulting in lower seismic demands on the supported structure and its non-structural components compared to a fixed-based building. However, the development of VFSs is still in early stage, and the performance of structures isolated with such systems is uncertain. Another recently identified challenge in designing isolation systems is the potential for large magnitude and long period earthquakes, in particular, the magnitude-9 (M9) earthquake in Cascadia Subduction Zone. The results obtained from recent numerical simulations indicated that this type of earthquake may be particularly detrimental for structures with fundamental periods of vibration of 1.0 second or larger. This finding may be particularly relevant for base-isolated structures, which tend to be characterized by large effective periods. However, such systems have not been included in the studies conducted thus far, and the effect of the simulated M9 earthquake on their performance remains unclear. To address the aforementioned knowledge gaps that are limiting the implementation of friction-type seismic isolation systems, this dissertation aims to: (i) develop an analysis, modeling, and design framework for structures isolated with VFSs; and (ii) evaluate how ground motions with different characteristics impact the performance and analysis of friction-type seismic isolation systems.
This report describes a HITEC evaluation designed to determine the basic capabilities and limitations of CON/SPAN Wingwalls for use as a precast retaining wall system. The evaluation was conducted based on design, construction, performances, and quality assurance information outlined in the HITEC Protocol.
Presents the results of a detailed evaluation for one technology out of eleven that were evaluated. The evaluations were designed to test the performance of seismic isolators and dampers produced by several manufactures.