双肢格构式桁架中单轴对称缀板柱弹性稳定分析及模拟试验研究

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1、重庆大学硕士学位论文双肢格构式桁架中单轴对称缀板柱弹性稳定分析及模拟试验研究姓名：周尚永申请学位级别：硕士专业：矿业工程指导教师：尹光志;庞永生2002.10.1重庆大学硕士学位论文中文摘要影构在摘要肢格构式单轴对称缀板柱绕实轴、虚轴以及弯扭屈曲进行了计算分析和比较，提出了绕虚轴侧向屈曲的换算长细比k=√砂2+∥2中的B值用H计算单元指出的计算公式，同时推导出了单轴对称缀板柱只出现绕实轴弯曲屈曲的最小肢间间距b。值的计算公式，这有利于格构式角钢桁架在工程中的设计和应用。本文还通过矩阵分析法和模拟试验研究，证实了端缀板的存在对抵抗侧向屈

2、曲有明显提高；而选用角钢代替缀板材料相对于板形板，有助于提高构件的侧移刚度和翘扭转刚度，这对于单轴对称缀板柱的设计也具有一定的实用价值。此外，由电算和实验分析可见，B值在缀板层数n>3以后，其变化受n值的影响不大，这说明用H计算单元导出的与缀板层数无关的B值计算公式是可以用于单轴对称缀板柱的侧向屈的计算。关键词：实膜式柘《格构簧穑架，单轴对称萄彼柱，弹甚看曲，端缀板，角钢缀材，板形缀材，H计算单元l。∥7V⋯ABSTRACTThetwin。walltrusshasbeenputintouseindesigningthewide-spa

3、nsteelrooftrussinordertOovercomethedisadvantagescausedbythelackoflaterllystiffnessintheone—walltruss．Thememberbearingcompressioninthetrusscouldberegardasabattenedcolumnwiththesingleaxisofsymmetry．InthecurrentCodeandresearchreferencesthereisnodetailedinformationforthemem

4、bertobendorbendwithtorsionaroundthehollowaxis．Accordingtotheelasticbuckingtheorythispaperreviewsandcomparesthecalculationsthatsuchmemberbendaroundtheteataxisandthehollowaxisaswellasbendwithtorsionaroundthehollowaxis．HerethispaperpresentsaformulaofcalculatingBusedin旯"=√砂

5、2+pⅢ2withtheH—shapedanglicizingelement．Meanwhile，thispaperdeducesoutaformulaofcalculatingb．by,whichthemembercouldbecontrolledtoonlybucklearoundtherealaxis．Bothformulasaboveareusefultodesignandapplythetwin—walltrussinengineering．Theresultsofthelimitedelementanalysisandex

6、perimentstudyconfirmsthatboththeresistingendedbattenandusinganglebatteninplaceofplateonecouldmakethelaterallystiffnessofsuchmembermorestrong．Thatmaybeprovidessomewhatpracticalbenefitsfordesigningthetwin-walltruss．Moreover,withthedatumcomefromcalculationandtest，itseamsth

7、atafterthenumberofbattenfloorn>3thechangeofBeffectedbynistooweaktobeignored．Hence，thatindicatesitisavailablethatthelaterllybuckleofthebattencolumnwiththesingleaxisofsymmetrycouldbecalculatedwith13workedoutfromH·shapedanglicizingelementwithoutn．Keywords：TheSolid-webtruss

8、，Theframe-worktruss，elasticbuckle，endedbatten，anglebatten，platebatten，H-shapedanglicizingelement，battenedcolum