California Department of Transportation

About: California Department of Transportation is a government organization based out in Sacramento, California, United States. It is known for research contribution in the topics: Poison control & Seismic analysis. The organization has 308 authors who have published 389 publications receiving 12623 citations. The organization is also known as: Caltrans & Bureau of Highways.

Assessment of the Undrained Response of Sands under Limited and Complete Liquefaction

Abstract: The technique presented deals with the assessment, based on drained test behavior and formulation, of the undrained postcyclic stress-strain behavior of sands under limited or complete (full) liquefaction and its associated strength. At present, there is no particular procedure that allows assessment of such undrained postcyclic behavior that could develop full (pore-water pressure ratio, ru =1 ) or limited ( ru <1 ) liquefaction. The prediction of the undrained postliquefaction (full or limited liquefaction) response presented here is based on basic properties of sand such as its relative density ( D rc ) [or ( N1 ) 60 blowcount], the effective angle of internal friction (φ) , the roundness of the sand grains (ρ) , and the drained axial strain at 50% stress level ( e50 ) . The technique presented accounts for the excess pore-water pressure induced by cyclic loading ( Δ uc ) and the postcyclic excess pore-water pressure generated under undrained monotonic loading ( Δ ud ) .

Impacts of traffic flow arrival pattern on the necessary queue storage space at metered on-ramps

Abstract: This paper compares queue lengths at the two different on-ramp configurations: arterial-to-freeway ramp and freeway-to-freeway connector. Mesoscopic queue length simulation models are developed bas...

Post-Earthquake Building Safety Inspection: Lessons from the Canterbury, New Zealand, Earthquakes:

Abstract: The authors discuss some of the unique aspects and lessons of the New Zealand post-earthquake building safety inspection program that was implemented following the Canterbury earthquake sequence of...

Shellfish Transport, Caloric Return Rates, and Prehistoric Feasting on the Laguna De Santa Rosa, Alta California

Abstract: Archaeological data from several sites along the Laguna de Santa Rosa in Sonoma County, California, show that marine shellfish were transported more than 25 km to the interior beginning about 2,600 years ago. Initiation of this activity seems to be linked to the rise of logistical organization associated with the more settled lifestyles of the Middle Archaic Berkeley Pattern. Analysis of energetic return rates for obtaining and transporting these resources indicates that better returns could have been achieved by staying closer to home. These findings may reflect feasting activities that served a variety of social functions well beyond the simple subsistence needs of the people.