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Predecessor
Volume 13, Issue 2
Displaying 1-5 of 5 articles from this issue
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Shoichi KOBAYASHI1975 Volume 13 Issue 2 Pages 1-11
Published: February 15, 1975
Released on J-STAGE: April 26, 2013
JOURNAL FREE ACCESSThe present paper is concerned with fracture mechanism or concrete system in the light of fundamental asppects of fracture mechanics. In the first half, fracture process and fracture mechanism from fracture initiation to ultimate fracture of multi-phase materials were discussed in comparison with fracture of structural system consist of many members, and then the universal properties of fracture criteria of the system subject to multi-axial stresses were discussed on the basis of the structural model of materials. In the second half, fracture mechanism of concrete system was discussed first, then methods of expression of changes of phenomenological response characteristics of the system, which reflect the change of the internal structure of the system, were considered. The structural models of frature of concrete system were also refered.View full abstractDownload PDF (1807K) -
Toshikazu TAKEDA, Yoshirou KOBATAKE1975 Volume 13 Issue 2 Pages 12-25
Published: February 15, 1975
Released on J-STAGE: April 26, 2013
JOURNAL FREE ACCESSIn order to use cast-in-situ continuous diaphram walls as structural elements of a building subjected to long-time earth pressure and seismic shear forces, at least, next three items have to be investigated.
(1) Concrete quality and bond strength of deformed bar in cast-in-situ diaphram wall (2) Resisting mechanism of whole structure against seismic forces and strength of cast-in-situ continuous diaphram walls under both shear force and bending moment.(3) Construction method to connect cast-in-situ diaphram wall with structural elements of a building and strength of connectings.
This report presents some examples of aseismatic design methods of a building with these underground structural elements and describes abstract of our study on physical property and structural behavior of these walls. And, the validity of this aseismatic design method was examined both through the experiments of the usual reinforced concrete models and through the experiments of full-size specimens built in the actual field.View full abstractDownload PDF (2736K) -
-Part 1. Elasto-plastic Behavior of Members-Masahide TOMII, Kenji SAKINO1975 Volume 13 Issue 2 Pages 26-41
Published: February 15, 1975
Released on J-STAGE: April 26, 2013
JOURNAL FREE ACCESSThis report is intended to give an over-view of our current state of knowledge regarding strength, stiffness and ductility of the concrete filled steel tube members (cicular and square section). Main discussion is concentrated on the triaxial confinement effect of the steel pipe on the infilled concrete.
First the behavior of concentrically loaded short columns and the buckling load of the long columns are discussed.
Then, the experimental and theoretical load-deformation relationships of columns under combined stresses of axial load, bending moment and sharing force are described, and the conventional design procedure is explained.
Lastly need researches of mechanical behavior of concrete filled steel tube members are pointed outView full abstractDownload PDF (2213K) -
N. NISHIZAWA, O. TAMAKI, H. YAMAUCHI, J. KODERA1975 Volume 13 Issue 2 Pages 93-110
Published: February 15, 1975
Released on J-STAGE: April 26, 2013
JOURNAL FREE ACCESSModel tests of the anchor frame, bond tests of the anchor bolt both in tension and compression, compression tests of the anchor bolt with steel frame embedded in the concrete and analysis of the stress in the anchor frame and footing by the finite element method were made to get design data for the calculation of the anchor frame, by which the steel column pier is fixed to the concrete footing.
As the results of the investigation, data concerning the co-operation of the anchor bolt and the anchor frame, the bond strength of the bolt in tension and in compression, the bearing strength of the concrete, the stress distribution of the anchor frame embedded in the concrete, the stress distribution of the footing were obtained.
Some result of the test show a quite different tendency compared with the assumption which is taken in the ordinary design of the anchor frame.
Using those data obtained by this study, it is possible to reduce the quantity of steel used in the anchor frame in the design.View full abstractDownload PDF (2168K) -
Yuji TAMURA, Koichi YONEYAMA, Sohei MATSUNO1975 Volume 13 Issue 2 Pages 111-119
Published: February 15, 1975
Released on J-STAGE: April 26, 2013
JOURNAL FREE ACCESSIn this studies, vibration tests were executed having used small cantilever models to know the dynamic characteristics of concrete. Having paid special attention to the fact that the big scale responses would be obtained in spite of small scale exciter if a resonance phenomenon should be skillfully applied, the small scale exciter, which was so designed to be in resonance for arbitrary input frequencies, was provided. Having applied this exciter for cement and resin mortar specimens, the following results were derived. (1) The effects of the so named“RECREX”exciter would exhibit its effect especially in the case where the input frequencies would be less than the natural frequencies of the specimens. (2) Resin mortar was more favourable material than cement mortar was, under dynamic loading conditions.View full abstractDownload PDF (1624K)
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