The unified numerical method with structural analysis and mass transfer analysis were presented. The numerical method was applied to cracking propagation problems during the life. The thermal crack analysis in early age considering the change of material properties with cracking and the shrinkage crack analysis considering moisture transfer, creep effect and the change of material properties with cracking were presented. It was confirmed that the developed method is useful to simulate the time dependent cracking propagation.
The purpose of this study is to clarify the effect of stirrups in deep beams by investigating the shear failure mechanism analytically by using the 3-D Rigid-Body-Spring Model analytical tool. The investigation of the analytical results of the internal stress state and 3-D deformations of deep beams were the key objectives of this study. Firstly, the applicability of the analytical tool on deep beams was confirmed by comparison of analytical and experimental results. Then, the stirrup contribution to load carrying capacity of deep beams was investigated and the shear failure mechanism based on the B and D region concept was clarified analytically. To achieve this, analytical results such as stress distribution, 3-D deformations, crack patterns and strain of stirrups were investigated. Three types of stirrup effect were observed in deep beams. In the a/d= 0.5 case, the peak load increase due to the confinement effect of stirrups. In the a/d=1.0 case, the stirrup contributes to the strut action that leads to an increase in load. In the case of a/d < 1.0, the D region is dominant. On the other hand, the peak load increases significantly with increases of stirrup ratio in the case of a/d > 1.5, in which the truss analogy is dominant rather than the strut action.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIsolation and Structure Determination of Novel Phosphatidylinositol Kinase Inhibitors, Echiguanines A and B, from Streptomyces sp.Hiroshi Nishioka, Tsutomu Sawa, Hikaru Nakamura, Hironobu Iinuma, Daishiro Ikeda, Ryuichi Sawa, Hiroshi Naganawa, Chigusa Hayashi, Masa Hamada, Tomio Takeuchi, Yoichi Iitaka, and Kazuo UmezawaCite this: J. Nat. Prod. 1991, 54, 5, 1321–1325Publication Date (Print):September 1, 1991Publication History Published online1 July 2004Published inissue 1 September 1991https://doi.org/10.1021/np50077a014Request reuse permissionsArticle Views168Altmetric-Citations29LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (306 KB) Get e-Alertsclose Get e-Alerts
RC部材に対して幾何学的非線形性および材料非線形性を考慮した有限要素解析を行い, 軸力・帯鉄筋比・引張鉄筋比・せん断スパン比がその靭性に及ぼす影響を解析的に検討した. また解析より得られた各種要因の影響を組み合わせることで, 靭性評価式の提案を行い, 既往の実験結果との比較より, 提案した靭性評価式が土木・建築のどの諸元に対しても有効で, 既往の推定式より精度がよいことを明らかにした.
In this study, the effect of the expansive site ratio on the anisotropy of expansion due to delayed ettringite formation (DEF) was numerically evaluated considering creep. In this analysis, aggregates and mortar were separately modeled using 3D-Rigid Body Spring Model. The expansion strain was applied to the expansive site for 200 days. Each analysis was conducted under stress-free and restraint conditions. As a result of the 1 % expansive site, the expansion under restraint condition was smaller than that under stress-free condition. In the case of a higher expansive site ratio, the expansion under restraint condition was larger, and the larger compressive stress was generated in the restraint direction. The reason why the expansion under restraint condition was smaller for the 1 % expansive site case is the less accumulated compressive stress due to the localization of expansion origin. Consequently, the expansion origin may be scattered in the actual phenomenon.
A pumping system was installed in the JT-60 machine to exhaust neutral particles from a divertor chamber. The objective of this system is an active particle control in neutral beam heated discharges. The pumps are composed of four Zr-Al getter pumps with a pumping speed of 5.3 m3/s in the diverter chamber. In addition, the particle flow from the divertor chamber to torus main pumps was enhanced by attaching augmentation plates inside the vacuum vessel. Baffle plates were also attached to reduce the conductance between the divertor and the main chambers. The pressure in the divertor chamber measured in ohmically heated divertor discharges increases approximately in proportion to the square of the line averaged electron density ne of the main plasma. A total gas exhaust rate of 2.4 Pam3/s is possible for ne = 1x1020 m-3, which is as large as the fueling rate by the neutral beam injection with a heating power of 20 MW.
Snow accumulation on transmission lines increases the conductor load. It may result in damage to transmission facilities due to abnormal load. As such, snow accumulation on transmission lines is one of the crucial problems. A method using the heat generated by the alternating magnetic field of a magnetic material wire has been developed and put into practical use. However, the method using conventional magnetic material can not gain sufficient calorific value to melt snow at some transmission lines through which only low current passes in the winter season. To solve these problems, we attempted to optimize alloy composition of Fe-Ni. In this research, we manufactured snow-melting wires varying Ni content and evaluated these magnetic characteristics and calorific value. In this result, magnetic characteristics and calorific value improved with increasing Ni content. A magnetic material optimized alloy composition showed calorific value of approximately 1.4 times as much as conventional magnetic material.
