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論文
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天田, 重庚 ; 長瀬, 裕機人
概要:
application/pdf<br />Journal Article<br />Bamboo is a composite material reinforced by fibers called bundle sheaths. It also has functionally graded structures on macro-and micro-scales. Bamboo has a cylindrical structure with
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many nodes, and its diameter and thickness vary with height from the ground, which is called the macroscopic graded structure. The fibers are densely distributed in the outer region, which is called the microscopic graded structure. This report presents an analysis of the large-deflective behavior of bamboo based on large-deflection beam theory. The analysis takes gravity and wind load into consideration The beam is modeled using the measured data of the sample bamboo. The maximum surface stress of the bamboo culm keeps approximately a constant even if wind load increases. Unique and smart structural behavior of bamboo deflection is described with respect to the graded structures.
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論文 |
論文
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松原, 雅昭 ; 藤村, 信洋 ; 丹沢, 聡
概要:
application/pdf<br />Journal Article<br />A creep constitutive equation is important for estimating creep deformation for structural designs under high temperatures. We can formulate the creep constitutive equation by characterizing
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a large number of creep curves. The characterization of a creep curve involves dividing the creep curve into three regions : transient, steady state and accelerating creep regions. Such characterization cannot be performed manually because of the massive amount of numerical data. This paper proposes a new algorithm for the characterization of the creep curve using fuzzy set theory. We use the fuzzy set theory for determining threshold levels between each region, because those levels have high fuzziness. The new algorithm enables us to mechanically characterize the creep curve without manual computation as well as to deal with massive amount of numerical data in a short time.
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