巻号一覧
60 巻 (2022)
- 6 号 p. 268-
- 5 号 p. 220-
- 4 号 p. 156-
- 3 号 p. 110-
- 2 号 p. 52-
- 1 号 p. 4-
前身誌
60 巻, 4 号
選択された号の論文の3件中1～3を表示しています
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論文
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山内 芳彦, 清野 昇亨, 青木 淳, 宮内 孝2022 年 60 巻 4 号 p. 156-173
発行日: 2022年
公開日: 2022/08/24
ジャーナル フリーOil storage tanks are usually constructed directly on tank foundations without anchors. In such a flat-bottom cylindrical tank subject to seismic horizontal force, a part of the bottom plate adjacent to the shell will be lifted off the tank foundation by the overturning moment, and excessive plastic strain cyclically occurs at the toe of the inside fillet weld of the shell-to-bottom joint.
Previously, expanding the basic theory of Elastic-Plastic Hinge Method (E.P.H.M.) to uplift behavior of flat-bottom of cylindrical tank, the authors proposed the analytical method to evaluate the integrity of annular plate adjacent to the shell from the viewpoint of seismic design, and calculations are carried out for a 32,000kl oil storage tank of high strength steel SPV490Q6)10). Furthermore, the equilibrium equations in consideration of 2 elastic-plastic hinges of uplifted bottom plate for the rigid sidewall tank are formulated, considering bilinear M～ϕ relationship of beams (Relation-Ⅱ), and calculations are carried out for a 18,200kl oil storage tank of middle strength steel SM490C11).
In this paper, the equilibrium equations in consideration of 2 elastic-plastic hinges of uplifted bottom plate for the elastic sidewall tank are formulated, considering nonlinear M～ϕ relationship based on elastic-plastic beam theory (Relation-Ⅰ). Then, calculations are carried out for 32,000kl/18,200kl oil storage tanks, and the effectiveness of this method is shown by comparing it with results of FEM non-linear axisymmetric analysis.抄録全体を表示PDF形式でダウンロード (1860K) -
岩堀 豊, 星 光, 鳥辺 哲人, 村上 貴志, 橋本 慎太郎, 谷野 忠和, 岡田 公一, 矢島 浩2022 年 60 巻 4 号 p. 174-180
発行日: 2022年
公開日: 2022/08/24
ジャーナル フリーRecently, Carbon Fiber Reinforced Plastic (CFRP) composites are applied to the aircraft structure and also the pressure equipment such as pressure vessels and pressure pipes, etc. In particular, CFRP composites used in the aircraft structure are exposed to a low temperature environment at high altitudes. Nevertheless, there is not enough opened public data of CFRP composite material for the fatigue strength properties under various environments including low temperature below 0℃. In addition, it is useful to investigate also the influence of sea water absorption characteristics of the CFRP composites on the strength properties since CFRP composites are expected its high corrosion resistance.
In this study, we conducted static tensile test and fatigue strength test at a low temperature of −54℃ by using specimens with a circular hole made of CFRP laminate composite plate soaked in artificial sea water enough and also carried out observation of the fatigue damage progression in the low and room temperature environments. That is, we have investigated the following strength properties of CFRP laminate composite, ⑴ the influence of artificial sea water absorption on the tensile strength at low temperature −54℃, ⑵ the fatigue strength of the specimens absorbing artificial sea water at low temperature −54℃, ⑶ the fatigue damage progression behavior observed with soft X−ray inspection.
From these test results, we have obtained the basic data of CFRP laminate composite to be utilized to various large-scale structures.抄録全体を表示PDF形式でダウンロード (1445K)
解説
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吉田 聖一2022 年 60 巻 4 号 p. 181-191
発行日: 2022年
公開日: 2022/08/24
ジャーナル フリーThe author has reported incidents of storage facilities for energy products at the EST-1 Committee of High Pressure Institute of Japan. The information was obtained from the internet when the incidents occurred. In this paper, 38 incidents of storage facilities for energy products which occurred overseas in the second half of 2021 are reported.抄録全体を表示PDF形式でダウンロード (1814K)
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