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1、 38 null 3 吉林大学学报( 工学版) null Vol.38null No.32008M 5 Journalof Jilin University (Engineering andTechnology Edition) null May 2008l :2007null10null25. : W 9 ( / 2005290| ); C 8 S / 1 (GC4A609);W : g S / 1 9 (2004AA9CS187)(7150080050).T e :f p B (1979null),3 ,p V 3 . Z _ :C .Enullmail:Y : (1965null),3
2、, q ,p V 3 = . Z _ :C .Enullmail: = 5 O r F s ?张博一1,郑文忠1,苑忠国2(1.哈尔滨工业大学土木工程学院, 哈尔滨150090;2.吉林电子信息职业技术学院材料工程系, 吉林省吉林市132021)K null 1 :通过4根预应力内置圆钢管桁架混凝土组合简支梁的试验,得到了试验梁的荷载null跨中挠度曲线a正截面承载力a裂缝分布与展开特征b结果表明:可基于平截面假定计算该类组合梁正截面的承载力,该类组合梁的平均裂缝间距取决于下弦钢管外径及下弦二钢管截面面积之和与截面有效受拉混凝土面积的比值b提出了与试验结果吻合良好的裂缝宽度和刚度计算公式b1
3、o M :工程力学;内置圆钢管桁架混凝土组合梁;正截面承载力;刚度;裂缝宽度;预应力 m s | :TU378.1null null D S M :Anull null c I | :1671null5497(2008)03null0636null06Mechanical propertiesof trussconcretecompositebeampreslressedencasedwithcircularsteel tubesZhang Bonullyi1,Zheng Wennullzhong1,YuanZhongnullguo2(1.School of Civil Engineering
4、, H arbin Institute of Technology , H arbin150090, China;2. Department of MaterialsEngineering, Jilin Technology College of Electronic Inf ormation, Jilin 132021,China )Abstract:A truss concrete composite freenullsupported beam prestressed encased with 4 circular steeltubes was tested and its curve
5、of loadnulldeflection at mid span, the bending loading capacity, thedistributionanddevelopment of the crackswere obtained. Theresultsshowed that the pure bendingregionof thebeam accordswiththeplanesectionassumptionfromloading tofailure, andtheaveragecrackspacing dependsonthe external diameter of the
6、bottom chordtubeandtheratio of the sum ofthesectionareasof thetwobottomchordtubestotheeffectivetensileconcretearea. Theformulasforthe bending loading capacity, thestiffness, andthecrackwidthwhichareingoodagreement withthetest resultsof the beamwerepresented.Keywords:engineering mechanics; truss conc
7、rete composite beam prestressed encased with circularsteel tubes; bending loading capacity; stiffness; crackwidth;prestressnull null O 9 O ,V + 1 p 1b 9 5 O 9 O ,; V % : a # 5 4 5 , V 4 O ? 5 J O 8 ,7 O 5 /? V s L d ,1 O f n F L 2bT X O ? = 5 O s ? 9 B t ,i | B t T 3,4b D 5 5 O s ? 第3期 张博一,等:预应力内置圆钢
8、管桁架混凝土组合梁的受力性能! 9 9 5 , - , = 5 O r F s ? ! 9 Z E n b Y V 4 = 5 O r F k ,4 F a # 9 Z E b1null k 1.1null ?F 5 O a/ ? # a| ( | Q345 A 5 o ,5 ? V 1 U bV 1null 5 ?Table1null Mechanicalproperties ofsteel tube? mmnull mmy M , . ; * y 9 / M I J. y ,2005,35(4):1null5.Zheng Wennullzhong, Wang Ying, Liu Tie,
9、et al.Thoughts andunderstandingofremodelingof addingstoreysaroundexistingbuildingJ. IndustrialConnullstruction,2005,35(4):1null5. 2 f p B , , .F O = O 1 s J. ,2007,22(8):60null63.Zhang Bonullyi, ZhengWennullzhong, WangYing. Analnullysis andconstrastoftwoprestressingstelltrusses incomposite frame gir
10、der J. Steel Construction,2007,22(8):60null63. 3 Zheng Wennullzhong,Liu Xunulldong,Zhang Genullming, etal. Experimentalresearchon ultimatebearingcapacnullityof grountednullroundnullsteelnulltube NnulljointJ. Journalof Harbin Instituteof Technology,2007,14(3):322null329. 4 ,f ,A , .9 Z 5 J K k J. v :
11、 ,2007,37(4):794null799.Zheng Wennullzhong,Zhang Genullming,Liu Xunulldong, etal. Experimental research on cavenullin ultimate bearnulling capacityof groutednullsquarenullsteeltubeJ. Journalof JilinUniversity(EngineeringandTechnologyEdinulltion),2007,37(4):794null799. 5 = , . 5 K k J.y ,2007,28(3):31null36.Huang Baonullchun, Huang Wennulljin. ExperimentalResearch on ultimate load carrying of truss gidersmade with circular tubes J. Journal of BuildingStructures,2007,28(3):31null36. 6 GB50010null2002 r ! 9 ? S S.!641!
