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1、第33卷第6期建筑科学与工程学报Vol.33No.62016年11月JournalofArchitectureandCivilEngineeringNov.2016文章编号:1673-2049(2016)06-0030-07基于舒适度的压型钢板-混凝土楼盖板厚取值研究屈文俊1,莫立标1,郭朋2(1.同济大学建筑工程系,上海200092;2.广州市设计院,广东广州510620)摘要:采用有限元软件ANSYS对大跨度压型钢板-混凝土组合楼盖模型进行数值分析,研究楼板厚度与固有频率、峰值加速度之间的关系,并给出了满足舒适度要求的板厚建议公式。结果表明:现有规范对于人行荷载的简化忽略
2、了人-板耦合等不利因素,使得峰值加速度计算结果偏小,人行激励模型应当考虑多阶简谐激励、作用位置变化以及人与楼盖相互作用;随着板厚的增加,刚度和质量对于楼盖体系固有频率的影响有一个临界点使固有频率取最小值,一味增加次梁数目到后期往往事倍功半;通过改变结构体系的布置来满足舒适度要求往往比改变板厚更为高效、经济;由于单人行走过程中楼板峰值加速度持续时间短,以均方根加速度作为评价指标更加合适。关键词:组合楼盖;固有频率;峰值加速度;次梁间距;板厚中图分类号:TU357.2文献标志码:AStudyonSlabThicknessofProfiledSteelSheeting-concre
3、teCompositeFloorsBasedonServiceability1,MOL-ibiao1,GUOPeng2QUWen-jun(1.DepartmentofStructuralEngineering,TongjiUniversity,Shanghai200092,China;2.GuangzhouDesignInstitute,Guangzhou510620,Guangdong,China)Abstract:Numericalanalysisonlarge-spanprofiledsteelsheeting-concretecompositefloorwascarr
4、iedtostudytherelationshipofslabthickness,naturalfrequencyandpeakaccelerationbyfiniteelementsoftwareANSYS,andthesuggestedformulaofslabthicknessmeetingtherequirementofserviceabilitywasgiven.Theresultshowsthatthepeakaccelerationcalculatedvaluesaccordingtothecurrentcodeareunderestimated,because
5、theunfavorablefactorsofperson-slabcouplingareignoredduetothesimplificationofpedestrianload.Thus,themult-iorderharmonicexcitationeffectandthechangeofpedestrianposition,aswellastheinteractionbetweenhumanandfloorshouldbetakenintoconsiderationinthehuman-inducedmodel.Astheslabthicknessrises,ther
6、eisacriticalvalueforgettingtheminimumfrequencytobalancetheeffectofstiffnessandmass.Increasingthenumberofsecondarybeamsonblindfaithmaynotleadtoabetterresulttosolvetheproblemofserviceability,andchangingthelayoutmaybemoreefficientandeconomicthanchangingslabthickness.Asthedurationtimeofpeakacce
7、lerationofslabistooshortduringsinglewalking,takingweightedrootmeansquareaccelerationasevaluatingindicatormaybemoresuitable.Keywords:compositefloor;naturalfrequency;peakacceleration;beamspacing;slabthickness收稿日期:2016-05-13基金项目:国家自然科学基金项目(51678430)作者简介:屈文俊
