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RISS 인기검색어
- 검색키워드
- 저자 : Jose M. Adam (검색결과 2 건)
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Jose M. Adam,Ester Giménez,Pedro A. Calderón 국제구조공학회 2008 Steel and Composite Structures, An International J Vol.8 No.4
The strengthening of reinforced concrete (RC) columns by steel angles and strips (steel cage) is one of various techniques available to increase ultimate column load. Different authors have shown the influence of the beam-column joint on the behaviour of columns strengthened by steel cages. This paper presents an experimental study carried out at the Universidad Politécnica de Valencia with the aim of analysing two different techniques to solve the strengthening close to the joint and the influence on the behaviour of RC columns strengthened steel cages. The ultimate loads obtained in the laboratory tests for these two techniques are compared to that specified by Eurocode 4.
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Mohammed S.M. Adam,Khalid A. Babikir,Jose F.H. Orellana,Young-Seog Kim 대한지질학회 2021 대한지질학회 학술대회 Vol.2021 No.10
The Amgififa deposit is located in the southwestern part of the Haya terrain in the Arabian Nubian Shield (ANS), Sudan. Mineral exploration and mining are active in this region at various scales (from artisanal to large-scale companies). The Ag, Cu, Zn, and Pb concentrations in the Amgififa deposit are ranging in 0.01-135 ppm, 35-30425 ppm, 18.49-1781.5 ppm, and 9.9-22797 ppm, respectively. However, the geological and structural setting of the deposit area is not well known because the host rock and ore bodies are covered by Quaternary sediments and active sands up to 7 meters. To unravel the structural controls on the Amgififa deposit, we conducted a systematic outcrop scale structural analysis based on the Amgififa mine pits and trenches. The geological and structural settings of the study area have high similarities with that of the southwestern part of the Neoproterozoic Nakasib Suture Zone (one of the most prominent structures of the ANS truncated by a younger SE trending sinistral Oko Shear Zone (OSZ)). The structural evolution in the region could be summarized as follows. At the early stage of D1, the NW-SE collision between Haya and Gebet terranes developed isoclinal inclined folds (F1) and regional foliation oriented NE-SW parallel to the F1 axial plane (transposition deformation). During the late stage of D1, the opening of the Amgififa pull-apart is triggered due to the dextral shear along right-stepping relay faults. During the D2 stage, as a result of a slight change in the regional stress direction from NW to NNW, the D1 structures and breccias within the pull-apart were uprightly folded with NE trending axial plane. During the D3 stage, the regional stress direction was changed to NNE, resulting in ~EW-trending folds (F3) and NNE extensional veins (Q2). Later on, D4 was developed when the dextral shear zones (which formed the pull-apart during D1) were inverted as sinistral due to ~ EW compression. During the D4 stage, EW extensional quartz vein and local thrust fault were formed around the deposit. The Amgififa deposit has the characteristics of non-classic VMS formed in a local extensional setting associated with a pull-apart resulted from the interaction between NW-SE trending shear zones.
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