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Predecessor
Volume 41, Issue 4
Displaying 1-8 of 8 articles from this issue
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H. Shiohara, H. Imai, M. Nishiyama2003 Volume 41 Issue 4 Pages 3-9
Published: April 01, 2003
Released on J-STAGE: April 26, 2013
JOURNAL FREE ACCESSThe technology of precast reinforced concrete structural system are on a big turning point. Sustainable developments with less environmental impact and consuming less natural resources are an apparent requirement of our society in the twenty first century. Requirement to producing building structures of low-cost, high-quality and high durability emerges as well as the traditional issue of seismic safety. The precast concrete technology may be enable us to solve these issues by developments of new seismic precast concrete structural systems. This paper reports the state-of-the-practice of precast concrete focusing on the recent development of new structural regulations for precast concrete structural systems in Japan and some other countres in high seismic zones induding New Zealand and the US.View full abstractDownload PDF (1389K) -
M. Hirosawa2003 Volume 41 Issue 4 Pages 10-19
Published: April 01, 2003
Released on J-STAGE: April 26, 2013
JOURNAL FREE ACCESSIn this explanative report, earthquake damage to beam-to-column joints of reinforced concrete buildings observed at the 1995 Hyogoken-Nanbu Earthquake was introduced and problems to the existing seismic design method for the joint was pointed out through the analysis on them. In the earthquake, remarkable damage to the beam-to-column joint panels mainly in medium-to-high rised reinforced concrete apartments designed by the current seismic standard were observed and most of them were demolished. Through the damage analyses based on the existing ultimate strength design mothod, it was made clear that the reason why the damage occurred and consideration of capacity reduction due to eccentric connection of beams to a column and the scale effect was neccessary to explain the damage. Although seismic design criteria to the joint panels was regulated after the quake, necessity to consider reduction factors was partialy explained and the condition may bring important seismic defects to reinforced concrete buildings in future.View full abstractDownload PDF (22388K) -
T. Ohno2003 Volume 41 Issue 4 Pages 20-28
Published: April 01, 2003
Released on J-STAGE: April 26, 2013
JOURNAL FREE ACCESSThe material presented herein summarizes the past and progressive researches on which the local damage of RC plates/slabs due to projectile impact is focused. Some early and present studies on impact problems are to establish new formulas or to examine the existent formulas to predict the local damage by solid projectile impact. To simulate and investigate analytically the behaviors of RC slabs, some typical computer codes have been applied, and the efforts to develop more precise constitutive model of concrete material have been continued.View full abstractDownload PDF (1955K) -
H. Tsukagoshi, Y. Jinno, H. Watanabe, S. Watanabe2003 Volume 41 Issue 4 Pages 29-36
Published: April 01, 2003
Released on J-STAGE: April 26, 2013
JOURNAL FREE ACCESSThe SR-CF system is a method for retrofitting existing reinforced concrete buildings against earthquakes by laminating carbon fiber sheets. The method improves the shear strengths of independent columns, columns with side walls, beams, and walls. Strengthening of reinforced concrete structures with carbon fiber sheets is the best method for retrofitting existing buildings since it features small and light materials, little noise and vibration, short working periods, and no welding works. Carbon fiber sheets, very strong against tensile forces, are little adhesive to concrete surfaces and prone to peeling from concrete when a force is applied. For this reason, the method has been effective as long as the peeling-off is prevented, such as by wrapping a carbon fiber sheet around an independent column and forming a hoop of carbon fiber. On the other hand, the SR-CF system is effective to retrofit columns with side walls, beams, and walls, around which hoops of carbon fiber sheets are difficult to form. The SR-CF system uses special devices called the CF- anchors to join the carbon fiber sheets which are separated by side walls and to fix carbon fiber sheets to reinforced concrete building frames. The use of the CF-anchor is the most characteristic in this system.View full abstractDownload PDF (31907K) -
M. Teraoka, N. Takamori, Y. Satoh, H. Sasaki2003 Volume 41 Issue 4 Pages 37-46
Published: April 01, 2003
Released on J-STAGE: April 26, 2013
JOURNAL FREE ACCESSIn this report, as for seismic design and performance evaluation on members of reinforced concrete framed structures, some questions for the analytical model of frame analysis, the seismic performance evaluation on short columns with super high-strength materials and beam-column joints with eccentricity were shown. The method of solutions for the questions mentioned above has been studied, referring to experimental data, the results of the study were shown.View full abstractDownload PDF (4745K) -
H. Matsunaga, F. Kogiku, M. Takagi, K. Tanishiki2003 Volume 41 Issue 4 Pages 47-54
Published: April 01, 2003
Released on J-STAGE: April 26, 2013
JOURNAL FREE ACCESSEco-oriented steel slag block is made from steelmaking slag, ground granulated blast furnace slag, etc. The steel slag block has features shown below. 1) Made from 100% recycled resources. 2) Same strength performance as ordinary concrete. 3) Good wear resistance. 4) Low alkaline elution. 5) Many biofouling organisms in marine environmentat. In the repair work of Mizushima Port, 150 thousand tons of steel slag block were used and their easiness of construction and low impact to ecology were confirmed during this work.View full abstractDownload PDF (23198K) -
S. Matsuoka, M. Saitou, T. Suzuki, K. Nishiwaki2003 Volume 41 Issue 4 Pages 55-60
Published: April 01, 2003
Released on J-STAGE: April 26, 2013
JOURNAL FREE ACCESSSpalling of tunnel lining concrete is currently a serious problem. For providing powerful solutions, various methods for tunnel repair and reinforcement are proposed. However, effective techniques that can be used in tunnels in service have not yet been well established. This paper deals with a newly developed reinforcing method applicable to tunnels in service and reports the case of its utilization in actual tunnels.View full abstractDownload PDF (28110K) -
[in Japanese], [in Japanese], [in Japanese], [in Japanese]2003 Volume 41 Issue 4 Pages 62-67
Published: April 01, 2003
Released on J-STAGE: April 26, 2013
JOURNAL FREE ACCESSDownload PDF (25532K)
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