The event was an outstanding seminar talk about the network of urban light rail system complex for "Tren Electrico," a total length of 133 km for the city of Lima, Peru. Line 1, the first segment of this network, is nearing completion and consists of a 12 km long elevated bridge structure and 10 overhead stations.
After a brief overview of the project, the presentation focused on the design and construction of two, cast-in-place, segmentally constructed, post-tensioned concrete bridges. Specific design challenges, solutions associated with the effects of ballasted track systems and a relatively large magnitude of live load on the segmental box girder were presented. The use of lightweight form travelers, the effect of concrete creep and shrinkage and the resulting impact on geometry control was discussed. Due to the high seismicity of this region, seismic design and detailing techniques were implemented.
The presentation was given by Raheel Malik, PE, who presently is a Lead Bridge Engineer and a Senior Associate at T.Y. Lin International's New York City office. Mr. Malik has been with T. Y. Lin International for 16 years and has vast experience with segmental bridge design, seismic design as well as design-build and public-private-partnership project delivery methods.