土木工程专业英语 教学课件 作者 陈瑛 7.4.Masonry Structural Design.ppt

《土木工程专业英语 教学课件 作者 陈瑛 7.4.Masonry Structural Design.ppt》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、7.4MasonryStructuralDesignWallsWallDistributionsMasonrystructuresgainstabilityfromthesupport.Lateralsupportmaybeintheverticaldirection--floor/roofbearingonthewallhorizontaldirection--crosswalls,piersorbuttresses.Lateralsupportscanlimitslendernessofamasonryelementsoastopr

2、eventorreducepossibilityofbucklingofthememberresisthorizontalcomponentsofforcesWalls--WallDistributionsAstructureshouldhaveadequatestabilityinthedirectionofboththeprincipalaxes.'crosswall'constructionmaynothavemuchlateralresistanceinthelongitudinaldirectionWallsaretobeun

3、iformlydistributedalongeachprincipalaxisoftheplanminimumthicknessofstructuralwallsshouldbe240mm.Walls--WallDistributionsCrosswallsactingasstiffeningwallscontinuousfromouterwalltoouterwallorouterwalltoaloadbearinginnerwall.Themaximumspacingofcrosswallinmasonrystructurewit

4、hreinforcedconcretefloorandroofis18mforseismicfortificationintensityof6and715mforseismicfortificationintensityof811mforseismicfortificationintensityof9Walls--HeighttoThicknessRatioofWallsLoadcarryingcapacityofamasonrymemberdependsuponitsheighttothicknessratioAmasonrymemb

5、ermayfailduetoexcessivestress-Formaterialsofnormalstrengthwithheighttothicknessratiolessthan30duetobuckling--formemberswithhighervalueofheighttothicknessratiothroughshearaction--veryshortmemberhavingheighttothicknessratioof<4byverticaltensilesplitting–memberwithheighttot

6、hicknessratioof≥4Walls--HeighttoThicknessRatioofWallsTheheighttothicknessratioforawallshallnotexceed26whenthegradeofmortarisnotlessthanM7.5.Limitingvalueofheighttothicknessratioforcolumnislessthanthatofwallsbecausecolumncanbucklearoundeitherofthetwohorizontalaxeswhilewal

7、lscanbucklearoundtheweakhorizontalaxisonly.Theheighttothicknessratioforaloadbearingunreinforcedcolumnshallnotexceed17whenthegradeofmortarisnotlessthanM7.5.Double-LeafWallsThetraditionalstonemasonryconstructionwithtwoouterlayersofuncoursedirregularlysizedrubblestoneswitha

8、ninnerinfillconsistingofsmallerpiecesofstoneboundtogetherwithlimemortarisnotrecommendedinearthquakezone