为研究不规则混凝土壳体在整体不均匀日照作用下的温度效应,运用太阳辐射和对流换热等相关知识,计算夏季 整体不均匀日照作用在一个不规则混凝土壳体表面产生的温度荷载,采用有限元软件 Abaqus6.n,分析该壳体在此种工况 下的温度场和温度应力,并将计算结果与该壳体在整体降温、整体升温及 自重3种工况下的温度效应进行对比分析。研究 结果表明:不规则混凝土壳体在夏季整体不均匀日照作用下的温度场分布很不均匀,向阳面的温度值比背阳面的高21.22 ℃ ;截面温度梯度符合指数函数分布;壳体在夏季不均匀日照作用下的最大主应力为 3.635MPa,比自重作用下的大 1.663 MPa,比整体升温作用下的大 0.542MPa,仅 比整体 降温作 用下 的小 0.146MPa。本文为不规则混凝土壳体的设计提 供 了一 定的参 考。 关键 词 :整体不均 匀 日照 ;不规 则混凝土壳体 ;温度荷载 ;温度 效应 中图分 类号 :TU37 文献标 志码 :A 文章编号 :1672—7029(2015)03—0624—07 Studyontemperature efectofirregularconcrete shellunderoveralluneven sunshine XIONG Gaoliang ,ZHOU Lingyu ,ZHANG Hanyi (1.SchoolofCivilEngineering,CentralSouthUniversity,Changsha410075,China; 2.MunicipalEngineeringBranchCompemyofChinaRailwayNo.4EngineeringGroupCo.Ltd,Hefei230000,China) Abstract:Inordertostudy thetemperatureeffectoftheirregularconcreteshellundertheactionofthewhole— nonuniform sunshine,thispaperappliesknowledgeaboutsolarradiation,convectionheatexchangeand otherrel— evantknowledge,calculatesthetemperatureload on thesurfaceoftheirregularconcrete shellgenerated bythe whole—nonunifeIrm sunshinein summer.usesthefinite elementsoftwareAbaqus6.11,analyzesthetemperature field and temperaturestressoftheshellinthiscondition,andcomparestheresultswith thatinconditionsofover— allcooling,overallheatand thegravity.Thestudy shows:the temperaturefield ofthe shellundertheeffectof thewhole—nonuniform sunshine in summerisvery inhomogeneous. Thetemperature ofthe surface exposed to thesun is21.22 ℃ higherthan thetemperatureoftheshaded surface.Thetemperaturegradientofthecrosspro— file accordswith exponentialfunction distribution.TheMaximum principalstressoftheshellunderthewhole— nonuniform sunshinein summeris3.635 MPa.Itis1.663 MPahigherthan thatundertheeffectofgravityand is0.542 MPahigherthan thatin theoverallwarm ingcase,whichiSiust0.146 MPalowerthanthatintheover. allcooling case.Thispaperprovidessome referencesforthe designofiregularconcrete shel1. Key words:thewhole—nonuniform sunshine;irregularconcrete shell;temperatureload;temperatureeffect
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