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| 2. |
- Schober, Kay-Uwe, et al.
(författare)
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FRP reinforcement of timber structures
- 2015
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Ingår i: Construction and Building Materials. - : Elsevier BV. - 0950-0618. ; 97, s. 106-118
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Tidskriftsartikel (refereegranskat)abstract
- Timber engineering has advanced over recent decades to offer an alternative to traditional materials andmethods. The bonding of fibre reinforced plastics (FRP) with adhesives to timber structures for repair andstrengthening has many advantages. However, the lack of established design rules has strongly restrainedthe use of FRP strengthening in many situations, where these could be a preferable option to most traditionaltechniques. A significant body of research has been carried out in recent years on the performanceof FRP reinforced timber and engineered wood products. This paper gives a State of the Art summary ofmaterial formulations, application areas, design approaches and quality control issues for practical engineersto introduce on-site bonding of FRP to timber as a new way in design for structural repair andrehabilitation.
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| 3. |
- Al-Emrani, Mohammad, 1967, et al.
(författare)
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Analysis of interfacial shear stresses in beams strengthened with bonded prestressed laminates
- 2006
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Ingår i: Composites: Part B - Engineering. ; 37, s. 265-272
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Tidskriftsartikel (refereegranskat)abstract
- In this paper, the problem of interfacial shear stresses in beams strengthened with bonded prestressed composite laminates is analyzed using linear elastic theory. The analysis provided a closed-form formula for calculating the critical maximum shear stress at the end of the laminate for a beam with arbitrary cross-section and material. A demonstration study on strengthening an existing steel bridge using this technique has also been conducted using FE-analysis. The results from both analyses agreed very well. Also, a parametric study is performed in order to identify the effects of various geometrical and material properties on the magnitude of interfacial shear stresses. The results show that there exists high concentration of shear stresses at the ends of the laminate, which might result in a premature failure of the strengthening scheme at these locations. Material properties such as laminate and adhesive stiffness and the dimensions of the laminate where all found to have a marked effect on the magnitude of maximum shear stress in the composite member.
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| 5. |
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| 6. |
- Al-Emrani, Mohammad, 1967, et al.
(författare)
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Experimental and numerical investigation of the behaviour and strength of composite steel-cfrp members
- 2006
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Ingår i: Advances in structural engineering. ; 9:6, s. 29-41
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Tidskriftsartikel (refereegranskat)abstract
- The use of advanced composite materials to strengthen and repair existing structures is increasing rapidly. One specific area in which the technique has recently been introduced is the strengthening of metallic structures with bonded carbon-fibre laminates. In this paper, the behaviour of composite steel-CFRP members is studied experimentally and using FE analysis. A new type of test specimen has been developed to examine the effect of various material parameters on the behaviour and strength of bonded steel-CFRP elements. Finite element analysis of the tested elements was also employed to examine the type and magnitude of interfacial stresses in the bond line of these elements. Moreover, different types of fracture mode could be examined by testing composite elements with different combinations of CFRP-laminates and adhesives. The tested composite elements displayed different behaviour and a large difference in strength and ductility could be observed.
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| 7. |
- Al-Emrani, Mohammad, 1967, et al.
(författare)
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Experimentelle untersuchung des ermudungsverhaltens genieteter trager
- 2002
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Ingår i: Stahlbau. ; 71:2, s. 145-150
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Tidskriftsartikel (refereegranskat)abstract
- The results from ten fatigue tests performed on six full-scale riveted stringers are presented and discussed. The stringers were taken from a 100 year old bridge, and the tests were performed at two different stress ranges: 60 and [similar to] 100 MPa. The tested stringers showed an excellent fatigue performance and their fatigue lives were in correspondence with or above the fatigue design curve given by the codes. Furthermore, the efficiency of using stop-holes to retard fatigue crack propagation in riveted girders was examined. The method was found to be an effective measure when aimed at temporarily arrest the crack propagation in riveted girders.
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| 8. |
- Al-Emrani, Mohammad, 1967, et al.
(författare)
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Fatigue performance of stringer-to-floor-beam connections in riveted railway bridges
- 2004
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Ingår i: Second International Conference on Bridge naintainace, Afety and Management.
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Konferensbidrag (refereegranskat)abstract
- Stringer-to-floor-beam connections in riveted railway bridges have in many casesshown to be critical details with respect to fatigue. These connections, while generally designedwith respect to shear forces alone, are often subjected to repeated out-of-plane distortion as a re-sult of their rotational stiffness.Static and fatigue tests involving three full-scale bridge parts have been conducted in order to study the behavior and the fatigue performance of riveted double-angle connections. The bridge parts were taken from an old riveted railway bridge built in 1896 and demolished in 1993. Each test specimen consisted of three floor beams and four stringers connected to each other with riv-eted double angles. Fig. 1 shows the set-up of the test specimens and loading arrangement, to-gether with a detail of the double-angle connections. Finite element analysis of the tested specimens was also performed in order to more closely study the load-deformation characteris-tics of these connections.
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| 9. |
- Al-Emrani, Mohammad, 1967, et al.
(författare)
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FE analysis of stringer-to-floor-beam connections in riveted railway bridges
- 2003
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Ingår i: Journal of Constructional Steel Research. ; 59:7, s. 803-818
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Tidskriftsartikel (refereegranskat)abstract
- The results from ten fatigue tests performed on six full-scale riveted stringers are presented and discussed. The stringers were taken from a 100 year old bridge, and the tests were performed at two different stress ranges: 60 and [similar to] 100 MPa. The tested stringers showed an excellent fatigue performance and their fatigue lives were in correspondence with or above the fatigue design curve given by the codes. Furthermore, the efficiency of using stop-holes to retard fatigue crack propagation in riveted girders was examined. The method was found to be an effective measure when aimed at temporarily arrest the crack propagation in riveted girders.
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| 10. |
- Al-Emrani, Mohammad, 1967, et al.
(författare)
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Overlooked Secondary Effects in Open-Deck Truss Bridges
- 2004
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Ingår i: Structural Engineering International. ; 14:4
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Tidskriftsartikel (refereegranskat)abstract
- Deformation-induced fatigue cracking has been a common source of fatiguedamage in steel bridges. These damage cases are often the result of secondaryrestraint forces generated by an unintended or overlooked interaction betweendifferent members in the bridge.A number of these interaction mechanisms areexamined in this paper using finite element analysis of a case-study bridge. Fieldmeasurements performed on the bridge were used to validate the analysis. Theresults of the analysis indicate that the effects of secondary forces, which developin different members of the floor system of riveted truss bridges, are generallynot negligible. In particular, the connections between different orthogonal membersof the floor system, such as stringer-to-floor-beam and floor-beam-to-chordconnections, might be critical with respect to fatigue due to these effects.
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