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Biomimicry and Theory of Structures-Design Methodology Transfer from Trees to moment frames

Journal of Bionic Engineering 2014年第4期11卷 638-648页

作者： Mark Grigorian MGA Structural Engineering Inc. 111 N. Jackson St. Glendale CA. 91206 USA

Currently, there are only three classical and a handful of emerging design methodologies available to structural engineers worldwide. None of these methodologies can explain the design concepts involved in the realization of natural structures such as trees, nor can they fully address the design needs of contemporary engineering structures. The recently developed Performance Control （PC） incorporates both the essence of the classical concepts and the newer procedures and addresses the observed performance of the structure during its known history of loading, PC attempts to mimic nature by applying the known theories of structures to the design of case-specific frameworks, rather than investigating their results for compliance against prescriptive criteria. Parametric examples have been provided to illustrate the applications of the conceptual design similarities between trees and manmade moment frames. It has been shown that an understanding of the structural performance of trees can enhance the structural design of moment frames, and that bioinspired PC can lead to minimum weight moment frames under lateral loading. The analogous performances of the natural and manmade structures may help explain the structural response of trees to similar loading scenarios.

关键词： performance control biomimetics trees moment frames lateral loading

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Simplified seismic fatigue evaluation for rigid steel connections

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Earthquake Engineering and Engineering Vibration 2003年第2期2卷 245-253页

作者： AymanA.Shama John B.Mander Stuart.S.Chen Parsons Corporation 100 BroadwayNew York.NY 10005USA Ph.D.P.E Department of Civil Engineering University of CanterburyNew Zealand Professor Department of Civil Structural & Environmental EngineeringState University of New York at BuffaloBuffaloNY 14260USA Associated Professor

A simplified fatigue-life model is proposed for assessing the seismic inelastic rotational capacity of steel *** relations are developed for rigid steel connections under lateral *** this is extended to account for the effects of the welded steel moment frame(WSMF)connections of the so-called pre-Northridge *** seismic fatigue theory is validated against experimental *** experiments were conducted under increasing ductility amplitudes until the onset of ***'rule was used to convert the test results to given an equivalent constant amplitude cyclic fatigue *** agreement is obtained when comparing the experimental observations with the theoretical predictions.

关键词： fatigue cyclic load seismic pile-to-cap moment frames connections steel

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