圆钢管混凝土桁架受力性能研究
Research on mechanical behavior of circular concrete filled steel tubular truss
-
摘要: 对矩形断面、倒三角形断面、梯形断面和正三角形断面4榀圆钢管混凝土桁架进行对比试验,研究不同断面形式的桁架受力分布模式.结果表明,桁架试件在0-2/6l段的桁架下弦节点受力较大,而试件TT上弦节点受力较大;断面形式的不同对桁架的上、下弦杆的轴力影响较大,且弦杆各个节段均承受很大的平面弯矩,而对腹杆的轴力分布模式影响不同,其中试件IT的腹杆受力比较合理.断面从矩形、梯形到倒三角形,对腹杆平面内弯矩影响越来越大,且下弦杆受力情况也越来越复杂;填充混凝土的上弦杆从矩形、梯形到倒三角形、正三角形这种断面的"削弱"对各段的杆件平面内弯矩影响不同.Abstract: To research the mechanical behavior of circular concrete filled steel tubular (CFST) truss, four truss specimens of the different sections such as rectangular truss,inverse-triangular truss,trapezoid truss and triangular truss were tested under static point loading.Results of these tests showed that truss specimens are stressed more in the segment 0-2/6l of the bottom chord,expect specimen TT which is stressed more in the top chord.The difference among these trusses sections has a great influence on the axial force of chord, and each segment bears quite large in-plane bending moment, but it has different influence on the web members.Among these trusses,webs of specimen IT have a more reasonable condition.The influence on web in-plane bending moment is larger and larger as the following order:rectangular section, trapezoid section, inverted triangularsection,furthermore, force condition of bottom chords is more and more complex.To the top chords filled concrete, section "weaken" from rectangular section to trapezoid section, inverted triangular section, and triangular section makes a different influence on in-plane bending moment of each segment.
-
-
[1]
Wardenier J, Kurobane Y, Packer J A,et al.Design Guide for Circular Hollow Section (CHS) Joints under Predominantly Static Loading[M].Cidect:TUV-Verlag,1991.
-
[2]
蔡绍怀.现代钢管混凝土结构[M].北京:人民交通出版社,2007.
-
[3]
Dutta D, Wardenier J, Yeomans N.Design Guide for Fabrication,Assembly and Erection of Hollow Section Structures[M].Cidect:TUV-Verlag,1998.
-
[4]
黄文金,陈宝春.腹杆形式对钢管混凝土桁梁受力性能影响的研究[J].建筑结构学报,2009,30(1):55.
-
[5]
刘永建,李运喜,刘君平,等.受压弦管填充混凝土的矩形钢管桁架静力性能分析[J].建筑科学与工程学报,2008,25(4):67.
-
[6]
刘永建,刘君平,杨根杰,等.主管内填充混凝土矩形钢管桁架受力性能试验研究[J]. 建筑结构学报,2009,30(3):107.
-
[7]
刘永建,刘君平,张俊光.主管内填混凝土矩形和圆形钢管桁架受弯性能对比试验研究[J].建筑结构学报,2010,31(4):86.
-
[8]
郑文忠,柳旭东,张博一.灌浆圆钢管桁架-混凝土组合梁试验研究[J].建筑结构学报,2009,30(1):15.
-
[9]
张一博,郑文忠, 王雪英.内置灌浆圆钢管桁架预应力混凝土连续梁受力性能试验研究和理论分析[J].建筑结构学报,2011,32(3):127.
-
[1]
计量
- PDF下载量: 23
- 文章访问数: 853
- 引证文献数: 0