加劲对冷弯薄壁卷边槽钢局部和畸变耦合屈曲作用

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黄丽华,康磊.加劲对冷弯薄壁卷边槽钢局部和畸变耦合屈曲作用[J].,2021,61(5):514-521

加劲对冷弯薄壁卷边槽钢局部和畸变耦合屈曲作用

Effect of stiffener on local and distortional coupled buckling of cold formed thin walled lipped steel with channel section

DOI：10.7511/dllgxb202105010

中文关键词:加劲冷弯薄壁卷边槽钢屈曲承载力局部和畸变耦合屈曲试验及计算研究

英文关键词:stiffener cold formed thin walled lipped steel with channel section buckling bearing capacity local and distortional coupled buckling experimental and numerical studies

基金项目:国家自然科学基金资助项目(5177811351678115).

作者	单位
黄丽华,康磊

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中文摘要:

为了研究加劲形式和尺寸对冷弯薄壁卷边槽钢局部和畸变耦合屈曲的作用，采用无劲截面、腹板加劲、翼缘加劲、腹板和翼缘均加劲4种截面形式的冷弯薄壁卷边槽钢柱，开展轴心受压试验研究．结果表明：相对于无加劲试件，加劲后试件的屈曲荷载均有所提升，其中腹板加劲及腹板和翼缘均加劲后抗局部屈曲效果明显，压杆的失效形式从局部屈曲向局部和畸变耦合屈曲以及畸变屈曲模式转变．进一步采用有限元方法分析了加劲尺寸对屈曲性能的影响．计算结果表明，腹板加劲深度与翼缘宽度之比约为0.12，加劲宽度与腹板高度之比约为0.2时，薄壁卷边槽钢的屈曲承载力提升幅度最大，且主要发生畸变屈曲．

英文摘要:

In order to study the effect of stiffener type and dimension on local and distortional coupled buckling of cold-formed thin-walled lipped steel with channel section, an axial compression test is carried out on four types of cold formed thin walled lipped channel steel column including unstiffened, web stiffened, flange stiffened, web and flange stiffened simultaneously. The results show that the buckling loads of the specimens with stiffener are increased compared with those without stiffener, among them the anti local buckling effect of web stiffened and web and flange stiffened is obvious. The failure modes transform from local buckling, local and distortional coupled buckling to distortional buckling. The influence of stiffener dimension on buckling performance is further analyzed by using finite element method. From the calculation results, it can be drawn that when the ratio of the depth of the web stiffener to the width of the flange is about 0.12, and the ratio of the width of the stiffener to the width of the web is about 0.2, the buckling bearing capacity of the thin walled lipped channel steel increases the most, and distortional buckling mainly occurs.

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加劲对冷弯薄壁卷边槽钢局部和畸变耦合屈曲作用

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