All issues
Volume 29 (1991)
- Issue 6 Pages 318-
- Issue 5 Pages 252-
- Issue 4 Pages 186-
- Issue 3 Pages 130-
- Issue 2 Pages 68-
- Issue 1 Pages 2-
Predecessor
Volume 29, Issue 3
Displaying 1-7 of 7 articles from this issue
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Hiroshi AKIYAMA1991 Volume 29 Issue 3 Pages 130-136
Published: May 25, 1991
Released on J-STAGE: August 05, 2010
JOURNAL FREE ACCESSTypical collapse modes of cylindrical storage tanks subjected to horizontal seismic motions are elephant-foot bulge at the lowest part of cylindrical wall and the fracture of bottom plate at the corner associated with up-lift of bottom plates.
On the other hand, the cylindrical tanks can develop considerable amount of energy absorption capacity until the collapse state of tank is reached.
The essential loading effect of earthquakes upon structures can be expressed in terms of energy.
By equating the energy input due to earthquakes to the energy absorption capacity of structure, a design criteria for cylindrical tanks can be derived on the basis of the ultimate strength.
In this paper, a recent advance in design criteria for cylindrical tanks is demonstrated.View full abstractDownload PDF (1900K) -
Takashi IWATA1991 Volume 29 Issue 3 Pages 137-144
Published: May 25, 1991
Released on J-STAGE: August 05, 2010
JOURNAL FREE ACCESSA state of the art earthquake sensing device called “SI-sensor” has been developed which would realize reliable system control during an major earthquake. To confirm the validity of the sensor further, Tokyo Gas has been conducting a long term observation project since 1985. The observation data analyses up until now show good prospect that the sensor could be used as a reliable shut-down sensing device for a wide range of industrial systems.View full abstractDownload PDF (668K) -
Nobuyuki KOBAYASHI1991 Volume 29 Issue 3 Pages 145-150
Published: May 25, 1991
Released on J-STAGE: August 05, 2010
JOURNAL FREE ACCESSThe sliding behavior of the cylindrical tanks was observed at past earthquakes. But there are few studies about the sliding behavior of tanks.
The objective of this study is to investigate the sliding behavior by the vibrational experiment using two types of the models without anchorage on the shaking table.
One is the rigid body model. The other is the elastic cylindrical tank model filled with water. These models are excited by increasing the exciting acceleration gradually until the sliding behavior is observed.
In the case of the rigid body model, the sliding is occured when the inertial force exceeds the Coulomb friction force. In the case of the elastic tank model, two kinds of the sliding patterns are observed. One is the parallel movement of the whole tank and the other is the rotation movement around the principle axis of the tank.
The parallel movement is observed when the inertial force exceeds the Coulomb friction force. This movement goes with the small rocking motion. The rotation movement is observed even though the inertial force is smaller than the Coulomb friction force. This movement goes with the large rocking motion. The results with a simplified rocking calculation model is compared with the test results, that is, the parallel movement and the rotation movement.View full abstractDownload PDF (662K) -
Yoshiatsu SAWARAGI1991 Volume 29 Issue 3 Pages 151-159
Published: May 25, 1991
Released on J-STAGE: August 05, 2010
JOURNAL FREE ACCESSVarious types of heat-resisting steels and alloys are in service as tube and pipe in high temperature section of power generation and chemical plants. For improving efficiency of the total system and for meeting requirements to cope with “dirty” fuels in some cases, these steels and alloys nowadays are being used in much severer conditions than before in terms of high temperature strength and corrosion resistance.
This paper describes the recent research and development trends of new heat-resisting steels and alloys for boiler tubes and pipes, fast breeder fuel cladding tubes, high temperature gas cooled reactor heat exchanger tubes and ethylene plant cracking tubes.View full abstractDownload PDF (2392K) -
Masaaki MATSUBARA, Akito NITTA, Kazuo KUWABARA1991 Volume 29 Issue 3 Pages 160-169
Published: May 25, 1991
Released on J-STAGE: August 05, 2010
JOURNAL FREE ACCESSA coal-gasification combined-cycle plant requires high efficiency through high-temperature operation. For this purpose, it is necessary to develop such material for gas turbine that has excellent high-temperature strength and hot-corrosion resistance. This circumstance made us pay attention to the single crystal superalloy to be used for blade and vane.
This paper describes the result of experimental investigation on high-temperature strengths of two single crystal Ni-base superalloys, CMSX-2 and CMSX-4, followed by comparison with that of a directionally solidified superalloy, Mar-M247. Through the study, the authors demonstrated that single crystal superalloys were more excellent in high-temperature strength than a directionally solidified superalloy and that the specimens machined from solid blades showed the same high-temperature strengths as those from solid bars.
The authors also carried out high-temperature low-cycle fatigue tests of CMSX-2 with holding. CMSX-2 showed significant decreases in fatigue lives due to holding, especially in compressive holding tests. The results can be explained by using the frequency modified Ostergren's method.View full abstractDownload PDF (2968K) -
Akito NITTA1991 Volume 29 Issue 3 Pages 170-176
Published: May 25, 1991
Released on J-STAGE: August 05, 2010
JOURNAL FREE ACCESSIn Japan, about 60% of fossil power plants belong to the “old plant” which is defined as a plant operated over 100, 000 hours in the national guideline notified in 1987 for extending an interval of periodical inspection. Thus, their accurate remaining-life assessment is essential for life extension as well as rational periodical-inspection of the old fossil plants.
Under such conditions, a study on the development of remaining life assessment methods for steam turbine rotor and casing has been carried out in the Central Research Institute of Electric Power Industry (CRIEPI). This paper presents a few findings (e. g., the delectability of creep damage by the nondestructive methods applied in practical use) which were obtained from the CRIEPI's study. Also, current approaches of remaining life assessment in Japan are reviewed in this paper.View full abstractDownload PDF (773K) -
Yasushi MUTO1991 Volume 29 Issue 3 Pages 177-181
Published: May 25, 1991
Released on J-STAGE: August 05, 2010
JOURNAL FREE ACCESSResearch and developments on the structural design criteria for the very high temperature components envisaged for the nuclear and space applications are now undertaken in the U. S., Germany and Japan. The very high temperature means a temperature exceeding that prescribed in the ASME Boiler and Pressure Vessel Design Code Sec. III, Case N-47. The characteristics in the very high temperature structural design are explained. The state of the arts of research on creep constitutive equation, creep-fatigue damage evaluation, welded joint and component test mainly in JAERI is introduced.View full abstractDownload PDF (550K)
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