Criteria for optimized design of demolition of a bridge: the Tenza bridge

Cadoni, Ezio and Asprone, Domenico and Prota, Andrea and Manfredi, Gaetano (2009) Criteria for optimized design of demolition of a bridge: the Tenza bridge. In: Sustainability of Constructions: Integrated Approach to Life-Time Structural Engineering. University of Malta, pp. 211-216. ISBN 978-973-638-428-8

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The Life Cycle Assessment (LCA) of a civil infrastructure needs to be conducted taking into account all the phases of its life-time, from the construction, to the service and main-tenance time, up to its dismissing phase, including demolition. In particular this last phase, in case of a large structure, like a bridge, can be particularly critical and expensive. In fact, in case of a bridge, the huge volume of waste materials to manage and environmental restraints can make the demolition very costly, from the economic and environmental point of view. This paper addresses this issue, considering a particular case study, the Tenza bridge, a dismissed highway bridge in Campania region. It is highlighted that in order to carry out the demolition of a bridge, or of a large critical infrastructure, aiming to contain economic and environmental costs, a detailed design needs to be conducted. In particular, a detailed knowledge of structural properties of the structure is necessary, since demolition, from the explosions phase to the induced progressive collapse, is strictly related to dynamic properties (strength and stiffness) of materials; hence, such properties need to be investigated and evaluated, in order to conduct an optimized design of all the demolition phase, aiming to contain economic and environmental costs.

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