http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Salih K. Alrebeh (검색결과 2 건)
- 무료
- 기관 내 무료
- 유료
-
Salih K. Alrebeh,Ahmed D. Ahmed,Ali K. Al-Asad,Talha Ekmekyapar 한국강구조학회 2023 International Journal of Steel Structures Vol.23 No.4
Concrete-steel composite columns have been utilized prevalently as load-bearing members in structures. The present study investigates the uniaxial behavior of concrete-filled steel tube (CFST) columns, which were proposed to provide high-strength steel bolts as external confinement to enhance the structural behavior of CFST columns. A total of 18 CFST columns were designed, out of which 12 columns were confined with steel bolts and 6 columns were unconfined; all columns were tested under axial compression. A mixture of self-compacting concrete (SCC) was utilized to fill all the test specimens. This study proposed an innovative approach to increase the restriction on lateral expansion of steel wall during elastic loading stage, which is expected to enhance structural behavior of CFST column. Test parameters included the effect of steel bolt spacing, three different (L/D) ratios, and two diffrent (D/t) ratios. The test findings demonstrated that the compression strength, axial stiffness, toughness, and ductility behavior of CFST columns increase as the spacing of steel bolts decreases and the improvement becomes more pronounced as the (L/D) and (D/t) ratios decrease. In addition, the compression capacity of the improved CFT short, medium, and long columns were enhanced by 25.3, 9, and 3.5%, respectively. A design model was developed to estimate the ultimate compression behavior of the improved CFST columns using steel bolts, and a close correlation was obtained between experimental findings and the proposed model.
-
Residual strength capacity of fire-exposed circular concrete-filled steel tube stub columns
Alhatmey, Ihssan A.,Ekmekyapar, Talha,Alrebeh, Salih K. Techno-Press 2018 Advances in concrete construction Vol.6 No.5
Concrete-Filled Steel Tube (CFST) columns are an increasingly popular means to support great compressive loads in buildings. The residual strength capacity of CFST stub columns may be utilized to assess the potential damage caused by fire and calculate the structural fire protection for least post-fire repair. Ten specimens under room conditions and 10 specimens under fire exposure to the Eurocode smouldering slow-growth fire were tested to examine the effects of diameter to thickness D/t ratio and reinforcing bars on residual strength capacity, ductility and stiffness of CFST stub columns. On the other hand, in sixteen among the twenty specimens, three or six reinforcing bars were welded inside the steel tube. The longitudinal strains in the steel tube and load-displacement relationships were recorded throughout the subsequent compressive tests. Corresponding values of residual strength capacity calculated using AISC 360-10 and EC4 standards are presented for comparison purposes with the experimental results of this study. The test results showed that after exposure to $750^{\circ}C$, the residual strength capacity increased for all specimens, while the ductility and stiffness were slightly decreased. The comparison results showed that the predicted residual strength using EC4 were close to those obtained experimentally in this research.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
