第36卷第3期 北京科技大学学报 Vol.36 No.3 2014年3月 Journal of University of Science and Technology Beijing Mar.2014 新型三重钢管防屈曲耗能支撑的力学性能 王树和，刘官印四，张举兵 北京科技大学土木与环境工程学院，北京100083 ☒通信作者，E-mail:gavin_lgy(@163.com 摘要基于在大跨网架结构中的应用，对目前的三重钢管防屈曲耗能支撑进行改进，设计了一种新型支撑，并对该支撑考 虑初始缺陷下的力学性能进行了理论分析.根据理论分析，设计了四组不同的支撑，利用ABAQUS有限元软件模拟分析了在 拉压循环荷载作用下支撑强度比对其力学性能的影响，包括连接段应力状态、滞回耗能能力和核心管屈曲破坏模式.研究结 果表明：该新型耗能支撑结构布置可行，设计方法合理，强度比是影响支撑力学性能的重要参数，在强度比合理范围内，支撑 具有良好的滞回耗能性能：在轴向循环荷载作用下，内外套管约束作用明显，核心管破坏模式为多波小幅屈曲破坏，变形稳 定，满足防屈曲支撑设计要求 关键词钢管结构：屈曲：支撑：滞回曲线：力学性能：有限元法 分类号TU352.1 Mechanical properties of a new type of triple-steel tube buckling-restrained brace WANG Shu-he,LIU Guan-yin,ZHANG Ju-bing School of Civil and Environmental Engineering,University of Science and Technology Beijing,Beijing 100083,China Corresponding author,E-mail:gavin lgy @163.com ABSTRACT Based on the application of long-span space truss structures,a new type of triple-steel tube buckling-restrained brace was proposed by improving and redesigning current triple-steel tube buckling-restrained braces.The mechanical properties of the brace were analyzed in consideration of initial imperfection.According to this analysis,4 groups of braces were designed and the effect of strength ratio on the mechanical properties,including the stress state of connection parts,hysteretic behavior,and the failure mode of the core tube,were studied under tension-compression cyclic loading using the ABAQUS software.It is shown that the new structure configuration is feasible and the design method is reasonable.Strength ratio is the key parameter affecting the mechanical properties, and within a reasonable range,the hysteretic performance is well.Under the axial cyclic loading,the effect of inner and outer bushing constraints is obvious,the failure mode of the core tube is multiple-wave small buckling,and the deformation is stably.So the new triple steel tube buckling-restrained brace meets the requirements of design. KEY WORDS tubular steel structures:buckling;braces:hysteresis loops;mechanical properties:finite element method 防曲支撑(buckling restrained brace,BRB)具备 到外围约束构件的限制，支撑内芯可以在拉压状态 普通支撑和金属阻尼器的双重功能，主要由支撑内 下实现全截面屈服而不发生屈曲.所以，防屈曲支 芯和外围约束构件组成，为了释放支撑内芯受压时 撑的耗能能力远远大于普通支撑. 所产生的膨胀变形，通常在两者之间设置无黏结材 三重钢管防屈曲耗能支撑主要由核心管、内外 料或适当的间隙.在中震和大震的作用下，由于受 约束套管组成，在核心管与内外套管间留有一定的 收稿日期：2012-12-19 基金项目：国家自然科学基金资助项目(51078033) DOI:10.13374/j.issn1001-053x.2014.03.020:http:/journals.ustb.edu.cn第 36 卷 第 3 期 2014 年 3 月 北京科技大学学报 Journal of University of Science and Technology Beijing Vol． 36 No． 3 Mar． 2014 新型三重钢管防屈曲耗能支撑的力学性能 王树和，刘官印，张举兵 北京科技大学土木与环境工程学院，北京 100083  通信作者，E-mail: gavin_lgy@ 163． com 摘 要 基于在大跨网架结构中的应用，对目前的三重钢管防屈曲耗能支撑进行改进，设计了一种新型支撑，并对该支撑考 虑初始缺陷下的力学性能进行了理论分析． 根据理论分析，设计了四组不同的支撑，利用 ABAQUS 有限元软件模拟分析了在 拉压循环荷载作用下支撑强度比对其力学性能的影响，包括连接段应力状态、滞回耗能能力和核心管屈曲破坏模式． 研究结 果表明: 该新型耗能支撑结构布置可行，设计方法合理，强度比是影响支撑力学性能的重要参数，在强度比合理范围内，支撑 具有良好的滞回耗能性能; 在轴向循环荷载作用下，内外套管约束作用明显，核心管破坏模式为多波小幅屈曲破坏，变形稳 定，满足防屈曲支撑设计要求． 关键词 钢管结构; 屈曲; 支撑; 滞回曲线; 力学性能; 有限元法 分类号 TU 352. 1 Mechanical properties of a new type of triple-steel tube buckling-restrained brace WANG Shu-he，LIU Guan-yin ，ZHANG Ju-bing School of Civil and Environmental Engineering，University of Science and Technology Beijing，Beijing 100083，China  Corresponding author，E-mail: gavin_lgy @ 163． com ABSTＲACT Based on the application of long-span space truss structures，a new type of triple-steel tube buckling-restrained brace was proposed by improving and redesigning current triple-steel tube buckling-restrained braces． The mechanical properties of the brace were analyzed in consideration of initial imperfection． According to this analysis，4 groups of braces were designed and the effect of strength ratio on the mechanical properties，including the stress state of connection parts，hysteretic behavior，and the failure mode of the core tube，were studied under tension-compression cyclic loading using the ABAQUS software． It is shown that the new structure configuration is feasible and the design method is reasonable． Strength ratio is the key parameter affecting the mechanical properties， and within a reasonable range，the hysteretic performance is well． Under the axial cyclic loading，the effect of inner and outer bushing constraints is obvious，the failure mode of the core tube is multiple-wave small buckling，and the deformation is stably． So the new triple steel tube buckling-restrained brace meets the requirements of design． KEY WOＲDS tubular steel structures; buckling; braces; hysteresis loops; mechanical properties; finite element method 收稿日期: 2012--12--19 基金项目: 国家自然科学基金资助项目( 51078033) DOI: 10． 13374 /j． issn1001--053x． 2014． 03． 020; http: / /journals． ustb． edu． cn 防曲支撑( buckling restrained brace，BＲB) 具备 普通支撑和金属阻尼器的双重功能，主要由支撑内 芯和外围约束构件组成，为了释放支撑内芯受压时 所产生的膨胀变形，通常在两者之间设置无黏结材 料或适当的间隙． 在中震和大震的作用下，由于受 到外围约束构件的限制，支撑内芯可以在拉压状态 下实现全截面屈服而不发生屈曲． 所以，防屈曲支 撑的耗能能力远远大于普通支撑． 三重钢管防屈曲耗能支撑主要由核心管、内外 约束套管组成，在核心管与内外套管间留有一定的