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RISS 인기검색어
- 검색키워드
- 저자 : Mostafa Fahmi Hassanein (검색결과 2 건)
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Haiyan Zhuang,Shujun Fang,Man Zhou,Mostafa Fahmi Hassanein 대한토목학회 2021 KSCE JOURNAL OF CIVIL ENGINEERING Vol.25 No.9
The dimensioning of the cross section is a critical step in designing wide box girder bridges with long cantilevers. The typical box girder cross section may not be the most economical and reasonable choice for wide box girder bridges considering the stress conditions and construction costs. Arranging transverse stiffened ribs underneath the top slab is an effective way to widen the bridge deck. In this study, the influence of the transverse stiffened ribs on the mechanical performance of the ribbed top slab is investigated by finite element (FE) modelling. The results show that the transverse mechanical properties of the box girders with ribbed slabs are significantly different from those of the traditional box girders with solid slabs. The ribbed slabs can provide additional transverse capacities over those of the traditional solid slabs. Furthermore, the transverse tensile stress in the root section of the ribbed cantilever slab is found to fluctuate periodically along its length, and a considerable stress concentration is observed in the transverse ribs. The key design parameters of the transverse ribs (depth, width and spacing) influencing the tensile stress amplitude at the cantilever root section are determined through FE parametric analysis.
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Chen Wei,Yong-Bo Shao,Mostafa Fahmi Hassanein,Chuannan Xiong,Hongmei Zhu 국제구조공학회 2023 Steel and Composite Structures, An International J Vol.47 No.4
To investigate the load bearing capacity of axially preloaded circular hollow section (CHS) stub columns strengthened by carbon fiber reinforced polymer (CFRP), theoretical analysis is carried out. The yield strength and the ultimate strength of a CFRP strengthened preloaded CHS stub column are determined at the yielding of the CHS tube and at the CFRP fracture, respectively. Theoretical models are proposed and corresponding equations for calculating the static strengths, including the yield strength and the ultimate strength, are presented. Through comparison with reported experimental results, the theoretical predictions on the static strengths are proved to be accurate. Through finite element (FE) analyses, parametric studies for 258 models of CFRP strengthened preloaded CHS stub columns are conducted by considering different values of tube diameter, tube thickness, CFRP layer and preloading level. The static strengths of the 258 models predicted from presented equations are proved to be in good agreement with FE simulations when the diameter-to-thickness ratio is less than 90ε 2 . The parametric study indicates that the diameter and the thickness of the steel tube have great effects on CFRP strengthening efficiency, and the recommended ranges of the diameter and the thickness are proposed.
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