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1、THETECHNIQUEOFADDINGEXTRA-FLOORSSPANNINGEXISTINGBUILDINGWITHSTEELSTRUCTURE1)1)2)SongFengWangYuanqingZhangYong(1DepartmentofCivilEngineering,TsinghuaUniversity,Beijing,100084P.R.China)(2DepartmentofCivilEngineering,BeijingJiaoTongUniversity,Beijing,100044P.R.Ch
2、ina)SONGFengisamastergraduatestudentattheDepartmentofCivilEngineering,TsinghuaUniversity.Histopicofdissertationisthetechniqueanalysisofaddingextra-floorsspanningexistingbuildingwithsteelstructure.SONGFengWANGYuanqingisaassociateprofessorattheDepartmentofCivilE
3、ngineering,TsinghuaUniversity.In1993,hegotPH.DintheUkraineandinthefollowingthreeyears,heworkedinthesteelconstructioninstituteasapostdoctoral.HismainresearchfieldisontheMechanismandDesignMethodofBrittleFractureunderLowTemperatureforSteelWANGYuanqingABSTRACTThet
4、echniqueofaddingextra-floorsspanningexistingbuildingwithsteelstructurehasmanyremarkableaspectsontechnology,economyandsafety.Inordertoextendapplicationofthisnewstructure,thispaperintroducesitsusualstructuralsystem,designproceduresandinitialanalysesofseismicperf
5、ormance.Meanwhilethispaperprovidescalculationmethodscombiningwithtwostudycasesandproposessomenewsuggestiontooptimizestructuraldesigncomparedwithsomeexistedprojects.Finally,thepaperdisscussestherelationsbetweentheoptimumresultsofdifferentstructuraldesignandtota
6、lsteelconsumption,whichprovidesabasisforschemeanddetaildesignofthisnewstructuralform.1.INTRODUCTIONWiththedevelopmentofeconomy,addingextra-floorsspanningexistingbuildingwithsteelstructure,asanewformoflightweightsteelstructures,hasbeenwidelyusedinmaintenanceand
7、reconstructionofbuilding,especiallyinthecitywheretherearedensebuildingsandshortlandresource.Thisisnotonlybecausethisnewtypeofbuildingincreasesutilizationareainsteadofoccupingnewplantation,butalsotherearelowsteelconsumption,lowconstructioncostandshortperiodsofc
8、onstruction.Comparedwithconcretestructure,thetechniqueofaddingextra-floorsspanningexistingbuildingwithsteelstructurehasfollowingadvantages:1)Goodseismicperformance.Steelstructuresh
