A non-linear optimisation technique based on the complex method: The optimal design of a concrete trough supporting a new lightweight rail track system, lr55

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.