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21.
Matthew J. Fox Timothy J. Sullivan Katrin Beyer 《Journal of Earthquake Engineering》2014,18(5):735-758
Capacity design aims to ensure controlled ductile response of structures when subjected to earthquakes. This article investigates the performance of existing capacity design equations for reinforced concrete coupled walls and then proposes a new simplified capacity design method based on state-of-the-art knowledge. The new method is verified through a case study in which a set of 15 coupled walls are subject to nonlinear time-history analyses. The article includes examination of the maximum shear force in individual walls in relation to the total maximum shear force in the coupled wall system, and subsequently provides recommendations for design. 相似文献
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Timothy M. LaPira 《政策研究杂志》2014,42(2):226-251
Does the emergence of a new boundary‐spanning policy regime shift the focus of well‐established organized interests, or does it mobilize new ones? In this article, I show that interest groups with a presence in Washington before 9/11 rapidly—but temporarily—shift their attention to the homeland security issues. Established groups' entrenchment in antecedent subsystems appears to buffer against widespread policy disruption and interest upheaval. However, a new set of previously latent groups opportunistically mobilizes after the regime is institutionalized. Newly mobilized groups replace those that retreat back to the regime's antecedent subsystems. Though the policy regime fails to resolve the jurisdictional turf conflicts that triggered its creation, the institutionalization of homeland security generates its own original, distinct government demand for lobbying. Interests that previously had no business in Washington before 9/11 took advantage of the new opportunities the regime offered without supplanting interests established long before the Department of Homeland Security and its congressional committees existed. 相似文献
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Prehistory vs. Archaeology: Terms of Engagement 总被引:1,自引:1,他引:0
Timothy Taylor 《Journal of World Prehistory》2008,21(1):1-18
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MEASURING THE IMPACT OF AIR POLLUTION ON PROPERTY VALUES 总被引:1,自引:0,他引:1
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Richard L. Francis Timothy J. Lowe Gerard Rushton M. Brenda Rayco 《Geographical analysis》1999,31(1):67-87
When solving a location problem using aggregated units to represent demand, it is well known that the process of aggregation introduces error. Research has focussed on individual components of error, with little work on identifying and controlling total error. We provide a focussed review of some of this literature and suggest a strategy for controlling total error. Consideration of alternative criteria for evaluating aggregation schemes shows that the method selected should be compatible with the objectives of the analyses in which it is used. Experiments are described that show that two different measures of error are related in a nonlinear way to the number of aggregate demand points (q), for any value of the number of facilities (p). We focus on the parameter q/p and show that it is critical for determining the expected severity of the error. Many practical implementations of location algorithms operate within the range of q/p where the rate of change of error with respect to q/p is highest. 相似文献
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What really goes on in Silicon Valley? Spatial clustering and dispersal in modular production networks 总被引:3,自引:0,他引:3
Is the geographic trajectory of capitalism toward spatial clusteringor dispersal? Recent theoretical work in the stream of relationaleconomic geography includes several dynamic elements that increasethe importance of spatial clustering over time. This paper developsthe concept of modular production networks toshow that spatial clustering and dispersal can be compatible,mutually reinforcing trends. Modular production networks encompassnodes of tacit activity linked through the exchange of codifiedinformation to create global-scale production systems. In placeslike Silicon Valley, industry participants rely on the benefitsof proximity to help build and manage global-scale productionnetworks. 相似文献