Andrea Palladio (30 November 1508 – 19 August 1580) was an architect active in the Republic of Venice. Palladio, influenced by Roman and Greek architecture, primarily by Vitruvius, is widely considered the most influential individual in the history of Western architecture. All of his buildings are located in what was the Venetian Republic, but his teachings, summarized in the architectural treatise I Quattro Libri dell'Architettura (The Four Books of Architecture), gained him wide recognition. The city of Vicenza and the Palladian Villas of the Veneto are UNESCO World Heritage Sites.
Truss
A truss is a structure comprising one or more triangular units constructed with straight members whose ends are connected at joints referred to as nodes. External forces and reactions to those forces are considered to act only at the nodes and result in forces in the members which are either tensile or compressive forces. Moments (torques) are explicitly excluded because, and only because, all the joints in a truss are treated as revolutes.
For centuries, builders used timber as a construction material for trusses, possibly even for truss bridges. However, it was not until 1570 that Andrea Palladio published Four Books on Architecture, the first written documentation concerning wooden truss bridges (Hayden 1976:51). Palladio, the first to promote the use of wooden trusses for bridge design, described several wooden trusses including the basic Kingpost and Queenpost designs. However, builders in Europe erected few wooden truss bridges until the eighteenth century, and then most commonly in heavily wooded countries such as Switzerland.
He presented a design of a truss bridge based on the principle that: "If a single triangle is rigid, combinations of triangles are also rigid."
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| Palladio's Truss |
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