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ID:38194021
大小:133.78 KB
页数:4页
时间:2019-05-27
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1、Lesson19StructuralAnalysisStructuralAnalysis结构分析Allstructuresmustbedesignedtosupportloadswithoutdangerofoverallcollapseorfailureofthecomponents.Newwordsandphrases:所有的结构都必须被设计得在不出现全面的倒塌或构件的ascertainprocedurefacilitateabruptcomplexitycoplanar破坏等危险的条件下就能支撑荷
2、载。nonconcurrentreactionsuperpositionunknowncontraflexurelaboriousOnewaytoassurestructuresafetyistoascertainthatstressesandstrainsredundantsimultaneousalgebramultiplicationinvertrandomproducedbyloadsarelessthanthoseallowedbyestablisheddesigncodes.neutrala
3、xis中和轴保证结构安全的一种方法是确定由荷载产生的应力、应变time-consuming耗时的比公认的设计规范所容许的应力、应变小。Thisdeterminationofstressesandstrainsinstructuresisaprimarypinjoint铰接objectiveofstructuralanalysis.angulardisplacement角位移在结构中确定应力和应变是结构分析的主要的目的。earthquake—resistant抗地震的Generally,analysisb
4、eginswithacheckoftheoverallstabilityofastaticallyindeterminatestructure超静定结构structure.通常,分析是从检查结构的总体稳定性开始的。土木工程专业英语1土木工程专业英语2StructuralAnalysisStructuralAnalysisThisinvolvesthedeterminationoftheforcesexertedbythestructureFinally,ifnecessary,thedeformatio
5、nofthestructureasawholeandofitsagainstitssupports.componentsmaybecalculated.这涉及到确定结构施加到它的支撑的力。最后,如果需要的话,还可能计算结构整体和各部分的变形。Ifthesupportsareadequatetowithstandtheforces,theyinturnreactThesestepsarefacilitatedbyuseofprinciplesandconceptssuchasthelawofwithequ
6、albutoppositeforcesagainstthestructure.equilibrium.如果支撑足够承受这些力,那么它们依次作用大小相等的反通过使用一些原理和概念,比如平衡原理,可以简化这些步骤。Manyofthesetoolsarebasedontheassumptionthatthestructureiselastic力到结构上。underloads;thatis,stressisproportionaltostrain.Ifcomputationshowsthatthereactio
7、nsbalancetheloads(weightof这些工具中的许多都是基于这样一个假定:结构在荷载作用下structure,occupants,storedmaterials,vehicles,wind,andearthquakeforces),thestructureisinstaticequilibrium.是弹性的,也就是说,应力和应变成比例。Thestructuralanalysisforstressesandstrainsinframemembersincludes如果计算显示反力平衡了荷载
8、(结构、人群、存放的材料等considerationofstaticloads,suchastheweightofthemembersandfloors,的重量,车辆荷载,风力和地震力),那么结构就处于静力平衡contentsofthebuilding,andliveloads(consideredtobestatic),anddynamic状态。loadssuchaswindandearthquakes.Thenextstepisdete
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