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　　【Asamethodofspanningspace,thearchcansupportgreaterweightthanahorizontalbeam.Itworksincompressiontodiverttheweightaboveitouttothesides,wheretheweightisbornebytheverticalelementsoneithersideofthearch.Thearchwor】

　　Asamethodofspanningspace,thearchcansupportgreaterweightthanahorizontalbeam.Itworksincompressiontodiverttheweightaboveitouttothesides,wheretheweightisbornebytheverticalelementsoneithersideofthearch.

　　Thearchworkedbydistributingthestructuralofabuildingtowardthecenterofthearch.

　　但是,原文说的是将重量分散到四周,为什么选这个?

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2020-05-3123:08

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　　Forhorizontalbeam,theweightisstraigtdown,itmeanstheverticalelementsoneithersideofthebeamneedtobearexactlytheweightextertsonthebeam.

　　Forthearchshape,theweightonitispointingtothecenterofthearch,vertically,theweightissmallerthanthetheactualweightexertedonthearch.therefore,theverticalelementsontheeithersideofthearchdonotneedtobearthatmuchweight.

　　其实就是力的分解.archshape的话,顶所受到的力都是指向中心的.垂直方向上施加给立柱的里是分解的力,显然要小于实际的力.