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This article examines the various types of technology used in modern buildings, tunnels, vehicles etc. to detect unwanted and potentially life-threatening fires. In selecting a detection system there is a need to balance responsiveness, reliability, cost and the potential for false alarms (sometimes referred to as ‘nuisance activations’) and no one...
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How we behave in a fire can be due to many factors such as familiarity with the building and its alarm systems as Michael Spearpoint from the Department of Civil and Natural Resources Engineering at the University of Canterbury explains.
Soil liquefaction during strong ground shaking results in almost a complete loss of strength and stiffness in the liquefied soil, and consequent large lateral ground movements. Both cyclic displacements during the intense ground shaking and development of liquefaction, and especially post- liquefaction displacements due to spreading of liquefied so...
The simplified analysis of piles in laterally spreading soils is burdened by uncertainties. Key parameters affecting the pile response, such as the stiffness degradation and lateral displacement of the liquefied soil, cannot be uniquely defined, but rather vary over a wide range. In this paper we explore the effect of variations of model parameters...
In the recent past a number of issues regarding the seismic performance of typical existing hollowcore floor systems have been raised. The most concerning of these is the vulnerability to loss of vertical support of the floor system at the end floor to seating beam connection. This vulnerability arises due to incompatibilities between the floor sys...
Spectrum intensity (SI), defined as the integral of the pseudospectral velocity of a ground motion from 0.1 to 2.5 sec, has recently been shown to be an intensity measure that efficiently predicts the seismic response of both liquefiable and nonliquefiable soil deposits as well as the seismic demands on pile foundations embedded in such deposits. I...
