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求一篇有关桥梁的英语作文

发表时间：2024-07-12 06:50:35 来源：网友投稿

有关桥梁的英语作文》

Bridgesareamongthemostimportant,andoftenthemostspectacular,ofallcivilengineeringworks.

Therearesixmaintypesofbridges:beambridges,cantileverbridges,archbridges,suspensionbridges,cable-stayedbridgesandtrussbridges.

Abridgeisdesignedfortrains,pedestrianorroadtraffic,apipelineorwaterwayforwatertransportorbargetraffic.Anaqueductisabridgethatcarrieswater,resemblingaviaduct,whichisabridgethatconnectspointsofequalheight.Aroad-railbridgecarriesbothroadandrailtraffic.

Bridgesmaybeclassifiedbyhowtheforcesoftension,compression,bending,torsionandsheararedistributedthroughtheirstructure.Mostbridgeswillemployalloftheprincipalforcestosomedegree,butonlyafewwillpredominate.Theseparationofforcesmaybequiteclear.Inasuspensionorcable-stayedspan,theelementsintensionaredistinctinshapeandplacement.Inothercasestheforcesmaybedistributedamongalargenumberofmembers,asinatruss,ornotclearlydiscernibletoacasualobserverasinaboxbeam.Bridgescanalsobeclassifiedbytheirlineage,whichisshownastheverticalaxisonthediagramtotheright.

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