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RISS 인기검색어
- 검색키워드
- 저자 : J. Ariffin (검색결과 2 건)
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MTP Validation Analysis of Scour Formulae in an Integral Abutment Bridge
P. T. Ghazvinei,H. Hassanpour Darvishi,J. Ariffin,S. H. Musavi Jahromi,N. Aghamohammadi,A. Amini 대한토목학회 2017 KSCE JOURNAL OF CIVIL ENGINEERING Vol.21 No.3
Utilizing the river floodplain for the purpose of urban landscaping and eco-tourism benefit could greatly reduce the river width that would eventually increase flood intensity. This could possibly weaken the bridge foundation that increase the probability of bridge failures due to scour. The main objective of this study is to evaluate scour predictive formulae at a protruding abutment bridge in the compound channel, using Multiple Testing Problem (MTP) in a geometrical model of an Integral Abutment Bridge (IAB). The results of the MTP and graphical comparison yield satisfactory predictive formula. Findings of the current study can help determining maximum scour depth as an essential component of footing design to optimize both construction and maintenance costs.
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OFF-SET CRACK PROPAGATION ANALYSIS UNDER MIXED MODE LOADINGS
A. E. ISMAIL,A. K. ARIFFIN,S. ABDULLAH,M. J. GHAZALI 한국자동차공학회 2011 International journal of automotive technology Vol.12 No.2
An assessment was carried out herein to study the eccentricity of cracks subjected to mixed-mode loadings. Several loading locations relative to a central line were selected to induce mixed-mode loadings, which were computed using a finite element method. An adaptive meshing technique was adopted during the simulation of crack propagation to ensure the singularity of stress at the tip of the crack. The stress intensity failure criterion was used and programmed, and the node splitting technique was used when the stress intensity factor reached the fracture toughness of the material to simulate crack propagations. It was found that large variations in the stress intensity factor were observed when off-set cracks were used, and that KII decreased when loading distance increased, but increased when the off-set crack distance was increased. Both crack eccentricity and loading distance played important roles in producing mixed-mode loading, compared to the influence of central cracks. Correction factors were introduced to modify the calculation of stress intensity factors under mixed-mode loadings. Simulations of crack propagation were also conducted to study the effects of crack eccentricities and loading distances. It was found that the crack length, the loading distance relative to the central crack and the crack eccentricity dominated calculations of the integrity of cracked structures.
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