<p>Several Elevated Transit Guideway projects in congested urban enviroments have been completed in the last 30 years. A lot more will be built in the near future to minimize the use of private cars, avoid traffic congestion and reduce carbon emissions. The use of precast segmental technology has been largely preferred for the construction of these structures for a number of advantages that the technology offers, including but not limited to: aesthetics, fast construction, durability, limited urban impact, low sensibility to construction constraints. In recent projects a some new governing design factors are being considered, such as sustainable construction, health and safety, materials efficiency, longer design life. Purpose of this presentation is to summarise the last thirty-years experience in design and construction of precast segmental elevated guideways, focusing on the key design factors such as: Urban impact, Train system – structure interaction, Noise emission Riding comfort, Design criteria, etc. In addition to the above, new factors that may govern the design and construction of the projects planned for the near future will be presented and discussed.</p>
Establishment of performance-based seismic design factors for precast concrete floor diaphragms
