冷彎圓鋼管壓彎構(gòu)件滯回特性研究*
宋長江，高修建
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(鐵道第三勘察設(shè)計(jì)院集團(tuán)有限公司, 天津 300251)
［摘要］基于相關(guān)試驗(yàn)數(shù)據(jù)驗(yàn)證數(shù)值分析方法后，利用ABAQUS軟件對(duì)冷彎圓鋼管壓彎構(gòu)件的滯回性能進(jìn)行參數(shù)分析。施加整體和局部初始幾何缺陷，考慮冷彎加工方式對(duì)構(gòu)件材料特性的影響，采用S4R單元以局部細(xì)化網(wǎng)格尺寸方式建模，依據(jù)ECCS加載制度，對(duì)直徑219mm，厚度分別為6，8，10，12mm，長細(xì)比分別為30，60，90，軸壓比分別為0.2，0.4，0.6的圓鋼管算例進(jìn)行了常軸力、循環(huán)彎矩作用下的有限元分析；對(duì)圓鋼管的極限承載力、延性系數(shù)、能量耗散系數(shù)等滯回性能指標(biāo)進(jìn)行了分析；探討了徑厚比、長細(xì)比和軸壓比等參數(shù)變化對(duì)圓鋼管滯回特性的影響。結(jié)果表明，隨徑厚比、長細(xì)比和軸壓比的增加，圓鋼管的極限承載能力和剛度降低，而耗能能力則受不同程度的影響。［關(guān)鍵詞］冷彎圓鋼管; 壓彎; 常軸力; 徑厚比; 長細(xì)比; 軸壓比; 滯回性能中圖分類號(hào)：TU391 文獻(xiàn)標(biāo)識(shí)碼：A 文章編號(hào)：1002-848X(2015)21-0041-06
Research on the hysteretic behavior of cold-formed steel hollow section membersSong Changjiang, Gao Xiujian(The Third Railway Survey and Design Institute Group Corporation, Tianjin 300251, China)Abstract: Based on the experiments data validated by the numerical simulation method, ABAQUS software was employed to analyze the influence factors for hysteretic behavior of cold-formed steel hollow section (CHS) members under constant compression and cyclic bending forces. General and local initial imperfection as well as special material property of cold-formed steel was considered. The models with local refined mesh size were built with element S4R. According to the ECCS loading law，the finite element analyses of CHS members with diameter of 219mm, thickness of 6,8,10,12mm and slenderness of 30,60,90, axial compression ratio of 0.2, 0.4, 0.6 under the constant axial force and cyclic bending moment were carried out, and the load-carrying capacity，ductility coefficient and energy dissipation coefficient of CHS members were obtained. The influence of parameters such as diameter-to-thickness ratio, slenderness ratio as well as axial compression ratio on the hysteretic behavior of CHS members were also discussed. It shows that with the increase of parameters above the ultimate load-carrying capacity and ductility of CHS members decrease and have different influence on energy dissipation capacity of CHS members.Keywords: cold-formed steel hollow section member; bend; constant axial force; diameter-to-thickness ratio; slenderness ratio; axial compression ratio; hysteretic behavior
*國家自然科學(xué)基金面上項(xiàng)目（51278036）。作者簡介：宋長江，教授級(jí)高級(jí)工程師，副總工程師，Eamil:lsqin64@163.com。
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