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1、Q420等边角钢轴压杆整体稳定性能试验研究1121133班慧勇,施刚,刘钊,石永久,王元清,邢海军,李茂华(1.清华大学土木工程系,北京100084;2.北京交通大学土木工程学院,北京100044;3.中国电力科学研究院,北京100055)摘要:国内大型输电铁塔中已逐步采用Q420高强度角钢。为研究此类高强度等边角钢轴压杆的整体稳定性能,进行了轴压静力试验研究,试验包括60个试件,截面类型选取了在所有热轧角钢截面中板件宽厚比最大的5种。基于试验结果,研究了Q420高强度等边角钢轴心受压柱的失稳破坏形态和极限承载力,通过计算得到其稳定系数
2、,并与现行钢结构设计规范的柱曲线进行了对比,同时分析了板件宽厚比超限对Q420高强度等边角钢轴压柱失稳破坏形态和稳定承载力的影响。结果表明:该类构件以弯扭失稳为主,根据试验实测得到的稳定系数明显高于现行钢结构设计规范所规定的等边角钢所在的b类截面柱曲线,甚至高于a类截面柱曲线。研究为后续的有限元计算和数值参数分析提供了重要的基础数据,为设计方法提供了参考建议。关键词:钢结构;高强度角钢;轴压;静力试验;稳定;柱曲线中图分类号:TU391TU31711文献标志码:AExperimentalstudyonoverallbucklingbeh
3、aviorofQ420highstrengthequalanglemembersunderaxialcompressionBANHuiyong1,SHIGang1,LIUZhao2,SHIYongjiu1,WANGYuanqing1,XINGHaijun3,LIMaohua3(1.DepartmentofCivilEngineering,TsinghuaUniversity,Beijing100084,China;2.SchoolofCivilEngineering,BeijingJiaotongUniversity,Beijing10
4、0044,China;3.ChinaElectricPowerResearchInstitute,Beijing100055,China)Abstract:TheQ420highstrengthangleswiththenominalyieldstrengthof420MPaarebeingappliedinlargetransmissiontowersinChina.Inthispaper,theaxialcompressioncolumntestwasconductedtoinvestigatetheoverallbucklingb
5、ehaviorofQ420highstrengthequalanglesunderaxialcompression,including60specimens,and5typesofsectionswhoseplatewidth2thicknessratioswerethelargestonesinallofthehot2rolledequalanglesections.Basedonthetestresults,thebucklingmodesandtheultimatestrengthoftheQ420highstrengthequa
6、langlecolumnsunderaxialcompressionwereanalyzed,andthebucklingstrengthofthespecimenswerecalculated,whichwerecomparedwiththecolumncurvesintheChinesecode.Besides,theeffectoftheplatewidth2thicknessratiooverrunonthebucklingmodesandtheultimatecapacityoftheanglecolumnswerealsos
7、tudied.Itshowsthatthebucklingmodeismainlyflexural2torsionalbuckling,andthebucklingstrengthsfromtestresultsaremuchhigherthanthosecalculatedaccordingtotheChinesecode.Theseresearchesprovideimportanttestdataforthefurthernumericalstudyandsuggestionsforbucklingdesignmethodofhi
8、ghstrengthangles.Keywords:steelstructure;highstrengthangle;axialcompression;statictest;buckling;columnc
