碳素方钢管腹板屈曲性能试验研究

发布时间：2018-10-23 09:07

【摘要】：对碳素方钢管在集中荷载作用下的腹板屈曲性能进行单调加载的试验研究。实施50个不同边界条件、加载条件、支承板宽度和截面高度的碳素方钢管试件的腹板屈曲性能试验。介绍了碳素方钢管腹板屈曲试验方案,描述了碳素方钢管在端部和内部集中荷载作用下的破坏模式,给出荷载-端位移曲线以及腹板区域应变强度分布曲线,并将边界条件、加载条件、支承板宽度和截面高度对碳素方钢管腹板屈曲极限承载力和延性的影响进行讨论。试验研究结果表明:碳素方钢管腹板屈曲极限承载力随着支承板宽度的增大而增大;当支承板宽度为50mm和100mm时,腹板高厚比为18时极限承载力达到最大;当支承板宽度为150mm时,腹板高厚比为12.55时腹板屈曲极限承载力达到最大;腹板高厚比为24.67时达到腹板屈曲极限承载力的最小值。受压腹板中部应变测点全部进入塑性并最终形成塑性铰区域。内部一侧翼缘加载(IOF)的极限承载力最高,内部两侧翼缘加载(ITF)的极限承载力次之,端部一侧翼缘加载(EOF)和端部两侧翼缘加载(ETF)的极限承载力最低。有限元方法较好地模拟了试验破坏模式和极限承载力。采用中国钢结构设计规范的碳素方钢管腹板屈曲极限承载力计算值远大于其腹板屈曲极限承载力试验值,中国钢结构设计规范用于腹板屈曲承载力的计算偏于危险;采用欧洲钢结构设计规范的碳素方钢管腹板屈曲极限承载力计算值又远小于其腹板屈曲极限承载力试验值,欧洲钢结构设计规范用于腹板屈曲承载力的计算偏保守。提出的碳素方钢管腹板屈曲极限承载力计算公式则较好地预测了试验值。
[Abstract]:The buckling behavior of carbon square steel tube web subjected to concentrated load was studied. The web buckling tests of 50 carbon square steel tube specimens with different boundary conditions, loading conditions, support plate width and section height were carried out. This paper introduces the buckling test scheme of carbon square steel tube web plate, describes the failure mode of carbon square steel tube under the action of end and internal concentrated load, gives the load-end displacement curve and the distribution curve of strain intensity in web area, and puts forward the boundary condition. The effects of loading conditions, width of supporting plate and height of section on ultimate buckling capacity and ductility of carbon square steel tube web are discussed. The experimental results show that the ultimate buckling capacity of carbon square steel tube web increases with the increase of the width of the supporting plate, when the width of the supporting plate is 50mm and 100mm, the ultimate bearing capacity of the web is 18:00 when the width of the supporting plate is 50mm and 100mm, and when the width of the supporting plate is 150mm, The ultimate buckling capacity of web is maximum when the ratio of height to thickness of web is 12.55, and the minimum value of ultimate buckling capacity of web is obtained when the ratio of height to thickness of web is 24.67. The strain measurement points in the middle of the compressed web all enter the plasticity and finally form the plastic hinge region. The ultimate bearing capacity of the inner flange loaded with (IOF) is the highest, that of the internal flange loaded with (ITF) is the second, and that of the end flange loaded with (EOF) and the end flange with (ETF) is the lowest. The test failure mode and ultimate bearing capacity are well simulated by finite element method. The calculated value of ultimate buckling capacity of carbon square steel tube web plate using Chinese steel structure design code is much larger than the test value of web buckling ultimate bearing capacity. The calculation of web buckling capacity of steel structure design code in China is more dangerous than that of steel structure design code. The calculated value of ultimate buckling capacity of carbon square steel tube web plate using the European Code for Design of Steel structures is far less than the experimental value of the ultimate buckling capacity of carbon square steel tube. The calculation of buckling ultimate bearing capacity of web plate of European Code for Steel structure Design is conservative. The formula proposed for calculating the ultimate buckling capacity of carbon square steel tube web is a good predictor of the experimental value.
【作者单位】：长江大学;华侨大学;
【基金】：国家自然科学基金(51278209,51478047) 福建省高等学校新世纪优秀人才支持计划(2014FJ-NCET-ZR03) 华侨大学中青年教师科研提升资助计划(ZQN-PY110)
【分类号】：TU392.3

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