I kid you not - our Deputy PM and Lutheran has another life, hopefully not one in which he squanders anything, especially his words - The Warren truss - An engineering truss is essentially a type of frame designed to transmit loads in structures to the supports. In this way the static loads (mass), and live loads (traffic, wind) can be transmitted safely to the piers and abutments which in turn transfer the loads to the ground. One of the approach spans under construction. One of the approach spans under construction. The number of ferries shows how eagerly the Bridge was awaited (NSWPWD). The Proud Arch p 80. Trusses were usually made of timber, iron, or steel. They are not as common as they used to be because modern bridges tend to be steel box girder, post-stressed concrete, or cable-stayed structures. A typical truss is made up of members that are joined together to form triangular sections. Members of a truss may be in tension, compression, bending or shear. There are a number of different ways in which members can be arranged to form a truss, and over the years different arrangements have been assigned different names for ease of identification. Truss types include the Lattice truss, the McDonald truss (there is an example at Galston Gorge), the Allan truss, the Pratt truss (Singleton), the Whipple truss (Lewisham and Nowra), the K truss (Hawkesbury River), and the Warren truss (Sydney Harbour Bridge approach spans). Truss joints can be pinned, or fixed (bolted, riveted, welded). The load analysis for a pin-jointed truss is reasonably straightforward (members are either in tension or compression), but much more complex in a fixed joint truss where the members may be in tension or compression and/or bending. The five approach spans on each side of Sydney Harbour are of the Warren type and each weighs approximately 1200 tons (1219 tonnes). The Warren truss approach spans use mild steel which, while not as strong as silicon steel, is more than capable of carrying the loads on the approach spans.
Posted on: Fri, 16 May 2014 01:25:42 +0000
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