Seismic Fragility Study of Displacement Demand on Fire Sprinkler Piping Systems

Seismic damage to fire sprinkler piping systems is not only caused by inertial forces or interstory drifts, but also by impact with surrounding objects. The collision of constituents of piping systems with nearby objects increases the chance of damage to the piping itself and to adjacent objects. In this study, the probability of seismic damage to fire sprinkler systems due to impact is quantified by obtaining seismic fragility parameters for large diameter pipes passing through walls and floors, as well as small diameter pipes that typically interact with suspended ceilings. The results of two shaking table experiments conducted at the University of Nevada, Reno and E-Defense test facility, and a high-fidelity numerical model of a hospital piping system are used to evaluate the displacement demands. Piping interaction fragility curves are generated based on clearances between adjacent objects and pipes. The probability of piping interactions and damage to piping systems subjected to different levels of peak floor acceleration is compared for different clearances. It is found that the probability of damage due to impact is comparable with the probability of exceeding other limit states, like the leakage in fittings, when a 1 in or 2 in gap is provided around large and small diameter pipes, respectively.     

Contesting Marshall Sahlins on Kinship

In a recent two‐part article on the nature of kinship, Marshall Sahlins maintains that performative criteria for kin‐reckoning are at least as salient as procreative ones, and that, at conception, an individual is endowed with a wide circle of kin, including the ancestral dead. For both reasons, he argues, there is no warrant for granting privileged status to what anthropologists have called ‘primary’ kinship. The contentions here are that performative criteria are modeled upon procreative ones; that ties to ancestral figures are seen as antithetical to procreative ties; and that, therefore, all kinship constructs are derived from nuclear family relationships. Evidence in support of these contentions is provided from the Mae Enga, Fiji, the Trobriands, and Aboriginal Australia.     

The earliest fractured tetrapod bone

A tetrapod radius from the Early Carboniferous Ducabrook Formation of the Drummond Basin, Queensland, is described. Early tetrapod radii are scarce in the fossil record but comparison with those available suggests that the new specimen is morphologically primitive. An unusual swelling of the proximal extensor surface is shown, by X-ray, to be a comminuted fracture, the earliest bone fracture recorded among tetrapods.     

Der gescheiterte Frieden von Münster: Spaniens Ringen mit Frankreich auf dem Westfälischen Friedenskongress (1643–1649)/La paix des Pyrénées. Vingt-quatre ans de négociations entre la France et l’Espagne (1635–1659)/Mazarin's Quest: The Congress of Westphalia and the coming of the Fronde

WALTER LAFEBER. The Clash: US-Japan Relations throughout History. New York: W. W. Norton & Company, 1997. Pp. xxii, 508. $29.95 (US); PATRICK SMITH. Japan: A Reinterpretation. New York: Pantheon Books, 1997. Pp. 385. $27.50 (US); MICHAEL SCHALLER. Altered States: The United States and Japan since the Occupation. New York: Oxford University Press, 1997. Pp. 320. $44.50 (CDN); STEPHEN D. COHEN. An Ocean Apart: Explaining Three Decades of US-Japanese Trade Frictions. Westport: Praeger, 1998. Pp. xi, 256. $65.00 (US). Reviewed by Warren I. Cohen