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ID:33913354
大小:1.24 MB
页数:5页
时间:2019-03-01
《考虑节点刚度的圆钢管混凝土桁架受压腹杆计算长度分析》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、第37卷第2期哈尔滨工程大学学报Vol.37№.22016年2月JournalofHarbinEngineeringUniversityFeb.2016考虑节点刚度的圆钢管混凝土桁架受压腹杆计算长度分析1,21王新毅,童乐为(1.同济大学土木学院,上海200092;2.南昌工程学院土建学院,江西南昌330099)摘要:为考虑节点刚度对钢管混凝土桁架中受压腹杆计算长度的影响,对圆钢管混凝土T/Y型节点在平面内弯矩作用下的抗弯刚度进行了数值研究,比较了空钢管节点和内填充混凝土钢管节点的抗弯刚度的差异,建立了钢
2、管混凝土节点的抗弯刚度参数计算公式,给出了考虑节点刚度的受压腹杆的计算长度。研究表明:空钢管节点的弦杆内填充混凝土后,节点的抗弯刚度有明显的提高,节点刚度取决于弦杆的径向刚度和弦杆、腹杆相贯面的表面积;节点刚度随β、τ的增大而提高,随γ、θ的增大而降低;受压钢管腹杆的计算长度沿用《钢结构设计规范》可能偏于保守;对于上、下弦杆均为圆钢管混凝土杆件的桁架,受压腹杆的计算长度可近似的取0.7l。关键词:圆钢管混凝土节点;圆钢管节点;节点抗弯刚度;受压腹杆;计算长度doi:10.11990/jheu.201409
3、034网络出版地址:http://www.cnki.net/kcms/detail/23.1390.u.20151229.1711.004.html中图分类号:TU392.3文献标志码:A文章编号:1006⁃7043(2016)02⁃0182⁃05Analysisofin⁃planeeffectivelengthofcompressivebracesofCHS⁃CFCHSjointsintrussstructuresbasedonjointrigidity1,21WANGXinyi,TONGLewei(1
4、.DepartmentofCivilEngineering,TongjiUniversity,Shanghai200092,China;2.DepartmentofCivilEngineering,NanchangInsti⁃tuteofTechnology,Nanchang330099,China)Abstract:Theeffectsofvariousfactorsonthejointrigidityofconcrete⁃filledcircularhollowsection(CFCHS)joints
5、wereanalyzedandcomparedwiththoseofcircularhollowsection(CHS)joints.Todeterminethecoefficientoftheeffectivelengthofacompressedbracethatisinfluencedbyjointrigidityinaconcrete⁃filledcircularsteeltubetruss,T/YCHS⁃CFCHSjointspecimenswithdifferentgeometryparame
6、tersunderin⁃planebendingmomentwereinvestigated.TheformulaofthejointrigidityofCHS⁃CFCHSjointsandthecoefficientoftheeffectivelengthofthecompressedbracewereestablishedbasedongeometryparametersofthejoints.ResultsshowthatthejointrigidityofCHS⁃CFCHSjointsincrea
7、seaccordinglycomparedtoCHSjoints.Jointrigiditydependsonthechordstiffnessandbrace⁃to⁃chordcontactarea;jointrigiditydecreasesasthevalueofγorθincreasesandincreasesasthevalueofβorτincreases.Thecomputationlengthofthecompressedbracemaybeconservativeifthecomputa
8、tionisperformedaccordingtothedesigncodeforsteelstructure;theeffectivelengthofthebracecanbeconsideredas0.7lintheCHS⁃bracetoCFCHS⁃chordtruss.Keywords:concretefilledcirclehollowsection(CFCHS)joints;circlehollowsection(
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