Testing of Tsunami waves against a reinforced concrete core wall. The specimen was instrumented with three different types of instruments to measure load, pressure sensors on the front face of the specimen, strain gauges on the piles that supported the specimen, and load cells measuring the total force on the setup. Stream-wise force, wave height, and velocity data are presented as averages across all trials conducted for this experiment.
more »
« less
1.4m Wave
Testing of Tsunami waves against a reinforced concrete core wall. The specimen was instrumented with three different types of instruments to measure load, pressure sensors on the front face of the specimen, strain gauges on the piles that supported the specimen, and load cells measuring the total force on the setup. The test specimen was placed inside a soil box with three different levels of soil examined to determine if changing the soil level changed the force in the support piles. Steam-wise force data was averaged across all trials for a given soil height and is presented for the three different force measurement techniques for the three different soil heights investigated. Wave gauge and ADV measurements are averaged across all trials for the given wave height.
more »
« less
- Award ID(s):
- 1726326
- PAR ID:
- 10381989
- Publisher / Repository:
- Designsafe-CI
- Date Published:
- Subject(s) / Keyword(s):
- Analysis of the Data Information on test setup and specimen construction Stream-wise force data Free surface elevation and velocity Data Instrumentation Experimental Results for 1.4m Wave Testing of a Reinforced Concrete Core Wall for Tsunami Vertical Evacuation Shelters in a Wave Flume Ohhwrl-Oregon
- Format(s):
- Medium: X
- Sponsoring Org:
- National Science Foundation
More Like this
-
-
Offshore foundation elements are often subjected to cycles of compressive and tensile loading. Open-ended pipe piles are frequently used as foundations for wind turbines as monopiles or as part of jacket structures. This paper reports the results of two open-ended pipe pile tests in a half-cylindrical calibration chamber with image analysis capabilities. The model piles, with diameters of 44 mm and 63 mm, were jacked into dense silica sand samples, statically load tested in compression, cyclically load tested (under displacement-controlled conditions), and statically load tested in compression a second time. The cyclic load tests had 100 cycles with a half-amplitude of 1 mm. Digital images captured during testing were analysed using digital image correlation to obtain the displacement fields in the soil domain. Image analyses of compressive static load tests indicate that the soil plug undergoes vertical compression during static loading. Cyclic loading leads to shaft resistance degradation, which is correlated with contractive radial strains around the model pile. Cycling also causes vertical compression below the pile base and inside the soil plug, which increases the base resistance of the piles and ultimately increases the total compressive capacity of the model open-ended piles under static loading.more » « less
-
An on-grade and an elevated specimen were tested and exposed to regular waves, in the Directional Wave Basin (DWB) at Oregon State University, with varying water depths and wave heights to simulate typical wave/surge conditions resulting from landfall hurricanes on low-lying barrier islands such as Hurricane Sandy that impacted the US East Coast in 2012 and Hurricane Ike that impacted the US Gulf Coast in 2008. Several instruments were used in the experiment, including nine wire resistance wave gauges located offshore, eight ultrasonic wave gauges located onshore near the specimens, four acoustic-doppler velocimeters, twelve pressure sensors, four load cells, and four triaxial accelerometers located on the specimens. The data (water depth, wave height, velocity, pressure, force, acceleration) gathered can help engineers and numerical modelers better understand the wave-structure interaction and help in improving design criteria of coastal light wood frame residential structures subjected to hurricane overland surge and wave loading.more » « less
-
null (Ed.)This paper presents a method for performing free-fall penetrometer tests for soft soils using an instrumented dart deployed by a quadcopter. Tests were performed with three soil types and used to examine the effect of drop height on the penetration depth and the deceleration profile. Further tests analyzed the force required to remove a dart from the soil and the effect of pulling at different speeds and angles. The pull force of a consumer drone was measured, and tests were performed where a drone delivered and removed darts in soil representative of a wetland environment.more » « less
-
Quantifying species’ niches across a clade reveals how environmental tolerances evolve, and offers insights into present and future distributions. We use herbarium specimens to explore climate niche evolution across 14 annual species of theStreptanthus(s.l.) clade (Brassicaceae), which originated in deserts and diversified into cooler, moister areas. To understand how climate niches evolved, we used historical climate records to estimate each species’ 1) classic annual climate niche, averaged over specimen collection sites; 2) growing season niche, from estimated specimen germination date to collection date, averaged across specimens (specimen-specific niche); and 3) standardized seasonal niche based on average growing seasons of all species (clade-seasonal niche). In addition to estimating how phenological variation maps onto climate niche evolution, we explored how spatial refugia shape the climate experienced by species by 1) analyzing how field soil texture changes relative to the climate space that species occupy and 2) comparing soil water holding capacity from each specimen locality to that of surrounding areas. Specimen-specific niches exhibited less clade-wide variation in climatic water deficit (CWD) than did annual or clade-seasonal niches, and specimen-specific temperature niches showed no phylogenetic signal, in contrast to annual and clade-seasonal temperature niches. Species occupying cooler regions tracked hotter and drier climates by growing later into the summer, and by inhabiting refugia on drought-prone soils. These results underscore how phenological shifts, spatial refugia, and germination timing shape “lived” climate. Despite occupying a large range of annual climates, we found these species are constrained in the conditions under which they thrive.more » « less
An official website of the United States government
