Transactions of the Architectural Institute of Japan

[title in Japanese]

Article type: Cover
1968 Volume 146 Pages Cover1-
Published: April 30, 1968
Released on J-STAGE: August 22, 2017

DOIhttps://doi.org/10.3130/aijsaxx.146.0_Cover1

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[title in Japanese]

Article type: Cover
1968 Volume 146 Pages Cover2-
Published: April 30, 1968
Released on J-STAGE: August 22, 2017

DOIhttps://doi.org/10.3130/aijsaxx.146.0_Cover2

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[title in Japanese]

Article type: Index
1968 Volume 146 Pages Toc1-
Published: April 30, 1968
Released on J-STAGE: August 22, 2017

DOIhttps://doi.org/10.3130/aijsaxx.146.0_Toc1

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ACCELERATED STRENGTH TESTS FOR EARLIER EVALUATION OF CONCRETE QUALITY

Tomozo SOSHIRODA, Yoshikazu FUJISAWA

Article type: Article
1968 Volume 146 Pages 1-12,51
Published: April 30, 1968
Released on J-STAGE: August 22, 2017

DOIhttps://doi.org/10.3130/aijsaxx.146.0_1

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Summing up the conclusions given within the scope of this experimental work, it may be stated that : Two procedures are used in this experiment as the method of accelerated strength test of concrete : Hot Water-Next Day Method and Boiling-Same Day Method. (1) Both the methods appear to be satisfactory means of accelerating the strength development of concrete for predicting 28-day strength at 24-hour or 5-hour, considering the practical use in field. (2) Comparing two methods, Hot Water-Next Day Method is better so far as the accuracy of predicting is concerned, on the other hand Boiling-Same Day Method is better so far as the rapidity, cost and simplicity are concerned. (3) The prediction of 28-day strength from the accelerated strength may be better than the one from 7-day strength from many points of view. (4) Overtime work for the accelerated test can be avoided because the delay time is shortened from the closed molds and both the test cycle are fitted to normal work time. (5) Cubic specimens may be more favorable than cylindrical specimens because the capping work complicates the test procedure but cubic specimens need no capping. It is felt through the investigation that the accelerated strength test should be used in order to not only estimate 28-day compressive strength but evaluate or determine "rapidly" various things related to concrete quality : for example, (a) to evaluate the strength and quality of hardened concrete-replacing the 28-day compressive test. (b) to estimate the water-cement ratio of field concrete. (c) to obtain the results of trial mixes for determining the mix proportioning of concrete or evaluating the quality of materials for concrete. (d) to evaluate the uniformity of field concrete. Further work is in progress on the accelerated strength test of concrete from the points of view above mentioned.

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EFFECTIVE WIDTHS AND FAILING BEHAVIOUR OF SIMPLY SUPPORTED REINFORCED CONCRETE T-BEAMS UNDER A CONCENTRATED LOAD

YOICHI HIGASHI, MASAMICHI OHKUBO

Article type: Article
1968 Volume 146 Pages 13-20,51
Published: April 30, 1968
Released on J-STAGE: August 22, 2017

DOIhttps://doi.org/10.3130/aijsaxx.146.0_13

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The purposes of this paper are to investigate the influences of the span ratios of flanges a/l_x and the thickness of flange for effective widths in elastic and plastic ranges, ultimate strengths and failing behaviour of reinforced concrete T-beams, and to discuss the application of elastic theory and the Code Requirements to effective widths of T-beams and the application of plastic bending theory to the ultimate strengths of T-beams. For these purpose, six simply supported reinforced concrete T-beams classifled by two kinds of a/l_x and three kinds of flange thickness were tested under a concentrated load, and effective widths and flexural rigidity in elastic range, effective widths for ultimate strength in plastic range and the shear cracks due to membrane shear stress at the joints of flange and web were analyzed and discussed. 1) Effective overhanging flange widths λ on either side of the web obtained from the experiments in elastic range decreased from the supports to the center of span and the distribution of λ along the span agreed with the curve calculated by two dimentional elastic theory. 2) Average values of λ along the span obtained from the experiments in elastic range agreed with the values of the Eq. (5) proposed by HIGASHI as average λ of members for the calculation of the flexural rigidities of T-beams. λ=(0.5-0.3a/l_x)a, [when a<l_x]……(5) Average values of-λ along the span obtained from the experiments for three kinds of flange thickness t/D=0.067, 0.133, 0.200 were approximately same and the influence of flange thickness for λ was not observed. 3) Ultimate strengths calculated by using full flange width as the effective flange width agreed with the values obtained from experiments in both positive and negative moments. It would be considered as the results of enough anchorage for longitudinal reinforcements and enough transverse reinforcements in flanges. 4) The shear cracks due to membrane shear stress were observed on the top surface at the joints of flange and web in plastic range. However, after such cracks occured the load did not decrease, because enough transverse reinforcements were placed at the joints. Tensile principal stress on the top surface at the joints when such cracks occured (which were calculated with the experimental results) were 1/12〜1/20 of the compressive strength of concrete F_c.

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EXPERIMENTAL STUDY ON TENSION-TYPE HIGH STRENGTH BOLTED CONNECTION : No.1 Influence of Initial Bolt Tension

BEN KATO, ATSUO TANAKA

Article type: Article
1968 Volume 146 Pages 21-27,52
Published: April 30, 1968
Released on J-STAGE: August 22, 2017

DOIhttps://doi.org/10.3130/aijsaxx.146.0_21

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The influence of initial bolt tension upon the mechanical characteristics of bolted connections are investigated by using simple specimens, of which bolts have different initial tension, and idealized model. The main results are as follows. 1) The separation load is in proportion to initial bolt tenssion without regard to the magnitude of initial bolt tension. 2) The ultimate strength of the bolted connection is constant regardless of the magnitude of initial bolt tension. 3) In order to keep the behavior of bolted connection in reversible condition, the limit of repeated loads is restricted under the elastic proof load of bolts. when the connection is subjected to the load, which gets beyond the elastic proof load of the bolts, the reduction of residual bolt tension, separation load and the rigidity of the connection take flace after unloadindg. The degree of those reduction changes according to the total deformation of the connection after separation. So the degree of those reduction is small, when bolts have large initial tension. Judging from the general test results, the magnitude of initial bolt tension has great influence upon the mechanical characteristics of bolted connection. So initial bolt tension is recommended to be large, but there is no advantage, when the bolt are stressed in plastic range. Finally the recommended initial bolt tension is as large as the bolt yield load.

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ULTIMATE STRENGTH OF WELDED JOINTS : Ultimate Strength of Fillet Welded Joints

TAKEO NAKA, BEN KATO, KOOJI MORITA

Article type: Article
1968 Volume 146 Pages 29-35,52
Published: April 30, 1968
Released on J-STAGE: August 22, 2017

DOIhttps://doi.org/10.3130/aijsaxx.146.0_29

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In order to estimate the ultimate strength of double strapped end, side and combined fillet welded joints, a series of experiments was performed in ten counties by the schedule of I. I. W. The test results have been analysed purely by I. I. W., but, in this paper, the results, supplemented by of another experiments performed by the authors, are analysed theoretically (on the basis of theory which was made public formerly : the ultimate strength of end fillet welded joints equals to 1.46A_1 σ_c/√<3>-by A_1 it means throat area and σ_c tensile strength of weld metal). And some considerations are given to the problems which difficult the estimate of the ultimate strength of fillet welded joints.

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ON THE SURFACE AREA OF EXTERNAL WALLS, PARTITIONS AND THEIR OPENINGS IN SMALL HOUSES : Studies on the Quantities of Building Elements, Part II

TADASHI EGUCHI

Article type: Article
1968 Volume 146 Pages 37-43,52-53
Published: April 30, 1968
Released on J-STAGE: August 22, 2017

DOIhttps://doi.org/10.3130/aijsaxx.146.0_37

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This report, following the privious one of this series by Dr. Utida, deals with an approximation of the surface area of building elements, such as exterior walls, partitions and their openings, in Japanese small houses. First, the basic relation between the floor spaces and the number of rooms (including closets larger about one meter square), grounded on some examples of one-storeyed house plan, is given as Fig. 1 (a) (b) and formula (4), This remarkble relation, being substituted to the previous results (1) (2) (3), brings out an monogram Fig.4 for the length of exterior walls and partitions (including open parts). As shown in Fig.3, the leugth of partitious ranges near about 0.6 meter per 1 m^2 of floor space, unconnected with the floor spaces. Next, an approach of the surface area of walls and partitions is given as Fig. 5〜9. It goes without saying that the opening that the opening ratio of walls in Japanese style houses or Japanese-European style houses differs so much from that in European style houses. The growing ratio of the length of exterior walls and other building element's quantity is described in case the proportion of the side length of rectangular plan is rather large or the plan has some convex and concave parts, comparing with that of exact square plan. Nearly same relations between one-storeyed plan and two-storeyed (or multi-storeyed) plan are also touched upon.

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THE STUDY ON THE SHOPPING BEHAVIOUR AND HOUSEHOLD ECONOMY IN SENRI NEW TOWN : (Part 2) The Result in the Same with the one Mentioned in the First Report

MORIAKI HIROHARA, TSUNEO KAJIURA, YOSHIKO HAMA, IKKO MIHARA

Article type: Article
1968 Volume 146 Pages 45-49,53
Published: April 30, 1968
Released on J-STAGE: August 22, 2017

DOIhttps://doi.org/10.3130/aijsaxx.146.0_45

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[title in Japanese]

Article type: Appendix
1968 Volume 146 Pages App1-
Published: April 30, 1968
Released on J-STAGE: August 22, 2017

DOIhttps://doi.org/10.3130/aijsaxx.146.0_App1

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