Thus, the AS procedures were still compatible in factor of safety for concrete members. LF rating procedures usually assign a dead load factor of 1.3 and live load factors of 2.17 (when computing Inventory Ratings) and 1.3 (when computing Operating Ratings).
Of the three rat species found in Hawaii, the black . rat, because of its size and arboreal behavior is considered the greatest threat to native Hawaiian forest birds. Rats also compete with forest birds for food items . such as native snails, insects, fruits, and seeds. Polynesian rats first arrived in Hawai`i with the . Polynesians (approx. 400A.D.) and black and Norway rats arrived with Westerners in the 1780s. Some species of rats can swim over a mile in open water, and can tread water for up to three days. Some species of rats can travel through sewer pipes and dive through water plumbing traps.
The Norway rat (Rattus norvegicus, Fig. 1) is a stocky burrowing rodent, unintentionally introduced into North America by settlers who arrived on ships from Europe. Also called the brown rat, house rat, barn rat, sewer rat, gray rat, or wharf rat, it is a slightly larger animal than the roof rat (Fig. 2).Adult Norway rats weigh an average of 1 pound (454 g). Their fur is coarse and usually brownish or reddish gray above and whitish gray on the belly.he presence of rats can be determined by a number of signs described below: Droppings may be found along runways, in feeding areas, and near shelter. They may be as large as 3/4 inch (2 cm) long and 1/4 inch (0.6 cm) in diameter. Fresh droppings are soft in texture.