Deflection Profile of a New Light Rail Track System.

Nageim, Hassan Al; Mohammad, FA; Lesley, Lewis

doi:10.1680/itran.1996.28844

Cited by 1 publication

(2 citation statements)

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“…A previous study (Al Nageim et al, 1996), indicated that the concrete trough experiences sagging and hogging moment during its service life so it is preferable to group the tendons in two layers, one placed near the bottom surface and the other near the top surface in order to achieve the greatest ultimate moment strength with a minimum prestressing force (Goble and Lapay, 1971;Naaman, 1976Naaman, , 1982. This, in turn, implies that the tendon layers' eccentricities can only be varied within a narrow range.…”

Section: Non-linear Optimisation Techniquementioning

confidence: 94%

“…The concrete trough can be either a reinforced or prestressed concrete section, precast or cast in situ. In earlier studies of this rail system (Al Nageim et al, 1996), CI 7,4 the shape and the size of the rail were fixed. The total width or depth of the concrete section can only be changed by altering the dimensions b 1 and d 1 (Figure 4), as the other dimensions b 2 , b 3 , d 2 and d 3 are restricted by the shape and dimension of the rail.…”

Section: Concrete Trough: Structural Optimisationmentioning

confidence: 99%

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A non‐linear optimisation technique based on the complex method

Nageim

Pountney

2007

Construction Innovation

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Purpose -The aim is to present findings of a theoretical analysis for optimal design of a concrete trough for a new lightweight low-profile rail track system. Design/methodology/approach -A non-linear numerical optimisation technique is adopted to predict the minimum area of a pre-tensioned pre-stressed trough section satisfying the serviceability and ultimate limit states as per British Standard BS 8110 for critical loading and boundary conditions. Findings -An optimum concrete trough section is calculated to carry all possible load combinations expected during the design life of the track. The performance of the rail, elastomeric pad and track base were found to be satisfactory under the same critical loading and boundary conditions. Originality/value -The theoretical analysis gives a valuable insight into system parameter values that can optimise design performance and cost. However, these optimal design features now need to be tested experimentally.

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Section: Non-linear Optimisation Techniquementioning

confidence: 94%

Section: Concrete Trough: Structural Optimisationmentioning

confidence: 99%