| 单词 | pratt truss |
| 释义 | > as lemmasPratt truss attributive. In bridge construction: designating a type of truss consisting of both vertical and diagonal elements, the latter (except for those at either end) all slanting downward towards the centre of the truss. Esp. in Pratt truss. ΘΚΠ society > occupation and work > industry > building or constructing > that which is built or constructed > [noun] > bridges > part of pile1440 saddle1831 Pratt1868 1857 Appleton's Cycl. Drawing 237 We instance figs. 52 and 53, as illustrative of two systems of bridge trussing, the one being an elevation of Howe's bridge Truss, the other of Pratt's.] 1868 Sci. Amer. 9 Dec. 371/2 The superstructure is of iron, on the Pratt truss principle. 1923 Lima (Ohio) News 13 Dec. 1/7 The bridge was a single span, known as a Pratt truss, the upper part being of iron and steel, resting on stone abuttments. 1978 J. E. Gordon Structures xi. 234 The Pratt or the Howe truss will work equally well upside-down. 2003 G. Biddle Britain's Hist. Railway Buildings 224/1 The girders are carried on a pair of Pratt trusses curved upwards from each end to a central pylon. < as lemmas |
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