大宽厚比对称填板双角钢十形组合构件轴压试验与设计方法对比
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摘要
对于扭转长细比大于弯曲长细比的大宽厚比对称填板双角钢十形组合构件而言,各规范采用不同方法来计算其稳定系数,填板的构造规定也有所不同,有必要结合试验实测数据,检验不同方法的计算精度和填板构造方式对承载力的影响。为此,进行了2类对称填板,共32个双角钢十形组合试件的轴压试验,得到了试件的应变、极限载荷等。试件横截面各测点应变差异较大,且破坏后轴线明显弯曲,该现象表明,虽然各试件的扭转长细比明显大于弯曲长细比,但所有试件最终发生了弯曲失稳。根据试件实测结果检验了不同设计方法的稳定系数计算精度,结果表明:扭转长细比大于弯曲长细比或试件两端之间仅有1个填板时,试件均表现出了良好的承载能力;按GB 50017—2003《钢结构设计规范》中扭转长细比确定的稳定系数远低于研究所得的试件实测值,而弯曲长细比对应的稳定系数与试验的实测值很接近;大多短角钢填板双角钢十形组合试件的轴向承载力略高于焊接填板试件,但前者的造价较低,推荐使用。
For the large width-to-thickness ratio closely star-battened angle column of symmetric battens whose slenderness of torsion is larger than that of bending,different methods of the codes are given to determine its compressive reduction factor and some constructional details about battens are also different. Therefore,it is essential to evaluate the accuracy of the methods to determine the reduction factor and constructional details based on the experimental study. Therefore,axial compression experiments involving two kinds of battens and 32 columns were conducted,and the key data such as strain and load capacity were recorded. The difference between the strain measured by the strain gauges on the same cross section is large and the axes of the specimens are obviously curved,which shows that: though the slenderness about the torsion of the columns is much larger than that about bending,the columns still fail because of bending. The reduction factors of the columns by the experiment and different methods of the codes are compared,and the results are: when the slenderness ratio about torsion is larger than that of bending or there is only one batten between the two ends of the column,the compressive capacity of the column is still high; the reduction factors determined by the slenderness ratio about torsion according to the codes such as GB 50017—2003‘Code for design of steel structures' is far less than those tested,while the reduction factors determined by the slenderness ratio of bending are quite near to those tested; the axial compressive capacity of the great majority of the columns with short angle battens is slightly higher than that of welded cross battens,and the former is cheaper.Therefore,the column with short angle battens is recommended to be used.
For the large width-to-thickness ratio closely star-battened angle column of symmetric battens whose slenderness of torsion is larger than that of bending,different methods of the codes are given to determine its compressive reduction factor and some constructional details about battens are also different. Therefore,it is essential to evaluate the accuracy of the methods to determine the reduction factor and constructional details based on the experimental study. Therefore,axial compression experiments involving two kinds of battens and 32 columns were conducted,and the key data such as strain and load capacity were recorded. The difference between the strain measured by the strain gauges on the same cross section is large and the axes of the specimens are obviously curved,which shows that: though the slenderness about the torsion of the columns is much larger than that about bending,the columns still fail because of bending. The reduction factors of the columns by the experiment and different methods of the codes are compared,and the results are: when the slenderness ratio about torsion is larger than that of bending or there is only one batten between the two ends of the column,the compressive capacity of the column is still high; the reduction factors determined by the slenderness ratio about torsion according to the codes such as GB 50017—2003‘Code for design of steel structures' is far less than those tested,while the reduction factors determined by the slenderness ratio of bending are quite near to those tested; the axial compressive capacity of the great majority of the columns with short angle battens is slightly higher than that of welded cross battens,and the former is cheaper.Therefore,the column with short angle battens is recommended to be used.
引文
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[14]韩军科,张春蕾,杨靖波.输电铁塔轴心受压构件稳定系数规范对比[J].中国电力,2014,47(3):90-95.(HAN Junke,ZHANG Chunlei,YANG Jingbo.Comparison of stability factors of axial compressive members intransmission towers in design codes[J].Electric Power,2014,47(3):90-95.(in Chinese))
[2]韩军科,杨靖波,杨风利,等.输电铁塔加固补强承载力研究[J].工业建筑,2010,40(7):114-117.(HAN Junke,YANG Jingbo,YANG Fengli,et al.Study on bearing capacity of reinforced and strengthened transmission tower[J].Industrial Construction,2010,40(7):114-117.(in Chinese))
[3]钢结构设计规范:GB 50017—2003[S].北京:中国计划出版社,2003.(Code for design of steel structures:GB 50017—2003[S].Beijing:China Planning Press,2003.(in Chinese))
[4]郭勇,沈建国,应建国,等.输电塔组合角钢构件稳定性分析[J].钢结构,2012,27(1):11-16.(GUO Yong,SHEN Jianguo,YING Jianguo,et al.Stability analysis on the multiple angle members of transmission towers[J].Steel Structures,2012,27(1):11-16.(in Chinese))
[5]刘海锋,韩军科,邢栋,等.十字双拼角钢柱绕虚轴弯曲屈曲临界力计算方法精度对比[J].工业建筑,2016,46(8):12-16.(LIU Haifeng,HAN Junke,XING Dong,et al.Accuracy comparison of different methods for buckling critical force about visual axis of double star-battened columns[J].Industrial Constructions,2016.46(8):12-16.(in Chinese))
[6]刘海锋,韩军科,王飞,等.双拼角钢主材输电塔静载试验研究[J].建筑结构,2016,46(14):42-45.(LIU Haifeng,HAN Junke,WANG Fei,et al.Static loading of transmission towers made of star battened angle columns[J].Building Structure,2016,46(14):42-45.(in Chinese))
[7]架空输电线路杆塔结构设计技术规范:DL/T5154—2012[S].北京:中国计划出版社,2013.(Technical code for the design of tower and pole structures of overhead transmission line:DL/T 5154—2012[S].Beijing:China Planning Press,2013.(in Chinese))
[8]ASCE.Design of latticed steel transmission structures:ASCE 10-1997[S].Reston,VA:ASCE,1997.
[9]刘红军,李正良.高强度双角钢十字组合断面承载力研究[J].工程力学,2013,30(1):140-146.(LIU Hongjun,LI Zhengliang.Study of ultimate strength of dual-angle cross combined section of high-strength steel[J].Engineering Mechanics,2013,30(1):140-146.(in Chinese))
[10]李振宝,石鹿言,刑海军,等.Q420双角钢十字组合截面压杆承载力试验[J].电力建设,2009,30(9):8-12.(LI Zhenbao,SHI Luyan,XING Haijun,et al.Research on bearing capability of Q420 dualangle steel cross combined section[J].Electric Power Construction,2009,30(9):8-12.(in Chinese))
[11]陈绍蕃.钢结构设计原理[M].北京:科学出版社,2005:90-95.(CHEN Shaofan.Principles of steel structure design[M].Beijing:Science Press,2005:90-95.(in Chinese))
[12]金属材料拉伸试验:第1部分:室温试验方法:GB/T 228.1—2010[S].北京:中国标准出版社,2010.(Metallic materials:tensile testing:part 1:method of test at room temperature:GB/T 228.1—2010[S].Beijing:Standards Press of China,2010.(in Chinese))
[13]韩军科,邱书清.输电铁塔十字组合角钢构件稳定性规范对比[J].建筑结构,2014,44(6):55-62.(HAN Junke,QIU Shuqing.Comparison of stability on the cruciform double angle section members of transmission towers in design codes[J].Building Structure,2014,44(6):55-62.(in Chinese))
[14]韩军科,张春蕾,杨靖波.输电铁塔轴心受压构件稳定系数规范对比[J].中国电力,2014,47(3):90-95.(HAN Junke,ZHANG Chunlei,YANG Jingbo.Comparison of stability factors of axial compressive members intransmission towers in design codes[J].Electric Power,2014,47(3):90-95.(in Chinese))