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Kou kouzou rombunshuu Vol. 20 (2013), No. 78

ISIJ International
belloff
ONLINE ISSN: 1884-0329
PRINT ISSN: 1880-9928
Publisher: Japanese Society of Steel Construction

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Kou kouzou rombunshuu Vol. 20 (2013), No. 78

EFFECTS OF MEMBER STRENGTH DETERIORATION ON SEISMIC RESPONSES OF EXISTING HIGH-RISE BUILDINGS MADE OF STEEL STRUCTURES AND CFT STRUCTURES SUBJECTED TO SEVERE GROUND MOTIONS

Yongtao BAI, Akihiko KAWANO, Shintaro MATSUO

pp. 78_1-78_14

DOI:

10.11273/jssc.20.78_1

Abstract

Extraordinary earthquakes which have been predicted in recent reports may induce the dissatisfactory of seismic demand and collapse of various existing high-rise buildings caused by the strength deterioration of structural components which is not fully considered in the past research. Various weak-beam planar-models of existing high-rise steel and concrete filled steel tube (CFT) frame buildings with different stories (20F, 30F and 40F) are designed, in which, the effects of strength deterioration after the local buckling of steel and CFT components in high-rise buildings are quantitatively considered to investigate the seismic capacity of high-rise steel and CFT buildings subjected to various high-level ground motions. Results show that the amplified effects of member deterioration on the seismic responses and hysteretic energy were captured in both steel and CFT building models. However, high-rise CFT building models demonstrate better capacity than S building models to avoid the local or global collapse, when the ground motions level is extraordinary. Assessment on the collapse resistant capacity of such tall buildings by incremental dynamic analysis clearly demonstrated the significant effect of local strength deterioration on the global seismic resistant capacity of high-rise building.

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Article Title

EFFECTS OF MEMBER STRENGTH DETERIORATION ON SEISMIC RESPONSES OF EXISTING HIGH-RISE BUILDINGS MADE OF STEEL STRUCTURES AND CFT STRUCTURES SUBJECTED TO SEVERE GROUND MOTIONS

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Bibtex

Ris

EXPERIMENTAL STUDY ON BUCKLING-RESTRAINED BRACES USING STEEL MORTAR PLANKS

Ryota IIZUKA, Takuya WAKAYAMA, Mitsumasa MIDORIKAWA, Mamoru IWATA

pp. 78_15-78_21

DOI:

10.11273/jssc.20.78_15

Abstract

The authors have developed a buckling-restrained brace providing stable hysteretic characteristic even under high-strain condition. However, deformation about strong-axis of a core plate may adversely affect the behavior of beams, columns or connections. In this paper, the tendencies of the deformation about strong-axis of a core plate are studied as a parameter by the difference of the core plate slenderness ratios. The number of the buckling modes is calculated using the formula that has been proposed from the past study. And, the influence of the buckling modes about strong-axis on the performance evaluation is considered.

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EXPERIMENTAL STUDY ON BUCKLING-RESTRAINED BRACES USING STEEL MORTAR PLANKS

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FUNDAMENTAL STUDY ON INFLUENCE OF HIGH-STRENGTH BOLTED COVER PLATE ELEMENT ARRANGEMENT ON FATIGUE STRENGTH FOR EMERGENCY CRACK REPAIR

Chao PAN, Takashi YAMAGUCHI, Yukiko MITSUGI, Akihisa KONDO, Kunitomo SUGIURA

pp. 78_23-78_31

DOI:

10.11273/jssc.20.78_23

Abstract

In this paper, high-strength bolted cover plate element is used for emergency fatigue crack repair with a drilled stop-hole. For using the high-strength bolted cover plate element, it can improve the cross section and the stress distribution, so it both delaying crack reinitiating and reinforcing lost cross section from crack are possible. This is a basic study, aims at finding the influence of the high-strength bolted cover plate element arrangement for deferring fatigue crack growth more effectively. Three types of specimens are determined by the arrangement on main plate, which has a same artificial fatigue crack. Base on fatigue test result, we will discuss the influence of the arrangement for deferring fatigue crack growth, and give advice for how to use high-strength bolted cover plate element to repair crack more effectively.

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FUNDAMENTAL STUDY ON INFLUENCE OF HIGH-STRENGTH BOLTED COVER PLATE ELEMENT ARRANGEMENT ON FATIGUE STRENGTH FOR EMERGENCY CRACK REPAIR

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INFLUENCE OF SURFACE ROUGHNESS AND CURVATURE RADIUS ON FATIGUE STRENGTH OF OUT-OF-PLANE GUSSET WELDED JOINTS WITH FINISHED WELD TOES

Takeshi MORI, Takanori MURAKAMI, Kouji YAMADA, Junichi IKOSHI

pp. 78_33-78_41

DOI:

10.11273/jssc.20.78_33

Abstract

As a method of finishing weld toes for improving the fatigue strength, a bar grinder is usually employed. It is known that fatigue strength of steel members depends on stress concentration and surface roughness at the fatigue crack originating point. One of controlling factors on the stress concentration at the finished weld toes is a radius of curvature. In this study, for the purpose of investigating the effects of the curvature radius and surface roughness on the fatigue strength of out-of plane gusset welded joints with finished weld toes, fatigue tests have been performed on model specimens.

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INFLUENCE OF SURFACE ROUGHNESS AND CURVATURE RADIUS ON FATIGUE STRENGTH OF OUT-OF-PLANE GUSSET WELDED JOINTS WITH FINISHED WELD TOES

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LATERAL BEHAVIOR OF CORRUGATED SHEET SHEAR WALLS FOR RESIDENTIAL COLD-FORMED STEEL FRAMING

Hiroshi TANAKA, Yoshimichi KAWAI, Shigeaki TOUNAI, Ryoichi KANNO, Yukihiro HARADA

pp. 78_43-78_55

DOI:

10.11273/jssc.20.78_43

Abstract

In general, shear walls with corrugated thin steel sheets in residential cold-formed steel framing have undesirable lateral deformation capacity as a result of the buckling of the corrugated sheets or pull-out of the screws used to connect the corrugated sheets to the cold-formed steel members. The purpose of the present study is to provide corrugated shear walls with a large deformation capacity by designing "bearing-failure critical" screw joints. The validity of this design was experimentally investigated using a series of in-plane cyclic racking shear tests of the corrugated sheet shear walls. The tests showed that the local bearingfailures provide a shear wall with a stable and ductile behavior.

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LATERAL BEHAVIOR OF CORRUGATED SHEET SHEAR WALLS FOR RESIDENTIAL COLD-FORMED STEEL FRAMING

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