Many wooden trusses built in the 19th Century were designed to be prestressed, in order to have both diagonals active without tensile connections. However, the viscous behaviour of wood can cause temporal losses in prestress. In the present contribution, a standard-linear-solid model for wood is used to carry out viscoelastic analyses. Simple prestressing experiments, to quantify the model parameters, are proposed. Results of viscoelastic analyses of the Pine Bluff Howe Bridge in Indiana are presented.
Viscoelastic Analyses of a Prestressed Howe Bridge
DA PORTO, FRANCESCA
2004
Abstract
Many wooden trusses built in the 19th Century were designed to be prestressed, in order to have both diagonals active without tensile connections. However, the viscous behaviour of wood can cause temporal losses in prestress. In the present contribution, a standard-linear-solid model for wood is used to carry out viscoelastic analyses. Simple prestressing experiments, to quantify the model parameters, are proposed. Results of viscoelastic analyses of the Pine Bluff Howe Bridge in Indiana are presented.File in questo prodotto:
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