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RISS 인기검색어
- 검색키워드
- 저자 : W. A. H. Mashrah (검색결과 2 건)
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W. A. H. Mashrah,Zhihua Chen,Hongbo Liu 한국강구조학회 2021 International Journal of Steel Structures Vol.21 No.3
In this study, a new dovetail system of single-layer reticulated shell socketed joint (NDJs) of steel with excellent mechanical behaviour and economic benefi ts is suggested and investigated. Theoretical and numerical approaches were adopted to explore the infl uence of the diff erent design parameters on the mechanical behaviour of NDJs under axial tension, compression forces and out-of-plane bending moment. First, NDJs exhibited two main failure modes under compressive force which occurred in the H-section beam and throat neck. On the other hand, the failure of the NDJs under tensile force occurred on the slot edges and hub ring, which means the NDJs TYS bearing capacity is responsive to slot edge width ( d m ) and hub ring thickness ( d w ). Moreover, the resisting bending failure characteristics of NDJs combined characteristics of resisting compressive and tensile forces. Second, formulae of compressive, tensile, and bending yield strength bearing capacity of NDJs were derived, and the average of analytical to numerical results was calculated. Analytical analysis results matched very well with the FEA results and showed a very high calculation validity and effi ciency. Finally, NDJs shows excellent behaviour under diff erent axial loads and bending moment comparing with other types of bolted or assembled joints with the same size or used materials.
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Reinforcement of Circular Steel Tubes Using Welded Casings Under Axial Compression Loading
Hongbo Liu,Jie Hu,Zhi-Hua Chen,Longxuan Wang,W. A. H. Mashrah 한국강구조학회 2022 International Journal of Steel Structures Vol.22 No.3
To explore the mechanical behavior of circular steel tube components strengthened with welded casings, two groups of six specimens are designed, and two working conditions of zero-load reinforcement and load reinforcement are defi ned. Typical failure modes, ultimate bearing capacity, defl ection curves, and strain data of measuring points are obtained. The FE modeling method considering the thermal eff ect of the welding process is proposed and verifi ed. A total of 446 fi nite element models are established to explore the eff ects of the initial defects, the slenderness ratio, the boundary conditions, and the area ratio of the welded casing to the circular steel tube on the ultimate bearing capacity of the strengthened components. In addition, the ultimate bearing capacity equations for zero-load strengthened components is proposed using regression fi tting and considering the adverse eff ects of the residual stresses due to the rolling and welding processes. Moreover, equations for calculating the deformation and the ultimate bearing capacity of the load-strengthened components considering the eff ect of the welding heat are also derived. Finally, the experimental, numerical, and theoretical analyses results were consistent in high calculation validity and effi ciency.
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