【摘要】 目的研究开孔式双钢管约束屈曲支撑的耗能减震性能,为双层网壳的减震控制研究提供一种新的减震控制方法.方法利用ANSYS有限元分析软件对开孔和不开孔的双钢管约束屈曲支撑进行了拉压循环荷载作用下的滞回性能的对比分析,以一跨度为100 m的双层球面网壳为例,用支撑替代结构中的部分下弦杆件及腹杆,建立了网壳减震结构的数值模型,采用三种不同的支撑布置方式对结构进行控制,进行了三维地震作用时程分析.结果开孔后支撑的承载力并没有降低,耗能系数略有提高,三种不同支撑布置方式下,结构的节点水平位移峰值最大减震系数为23.8%、节点竖向位移峰值最大减震系数为24.3%.最大杆件轴力响应明显减小,腹杆替换效果为最好,达到30%～40%;替换下弦杆方式以及同时替换部分下弦杆的控制效果均在20%以上.结论双钢管约束屈曲支撑开孔后构造简单,耗能能力强,将其合理布置在双层网壳结构中,减震效果较好.更多还原

【Abstract】 The purpose of this paper is to study the seismic energy dissipation performance of perforated double tube buckling-restrained brace(BRB),and to provide a new method for the seismic control of double-layer reticulated shell.Finite element analysis software ANSYS is used to analyze and contrast the hysteretic behavior under cyclic loading between perforated double tube buckling-restrained brace and traditional double tube buckling-restrained brace.In this paper,taking a 100m span double-layer reticulated shell as an example,the numerical model of seismic reduction structure by the replacement of some lower chords and web member with buckling-restrained brace is established,and the time-history response of structure in three arrangement modes under three-dimensional earthquake action is analyzed.The results show that the bearing capacity of perforated double tube buckling-restrained brace does not decrease and the dissipative coefficient slightly increases.The maximum damping coefficient of horizontal nodal displacement in three arrangement modes is 23.8 percent,and the vertical displacement is 24.3 percent.The maximum dynamic axial force of members decreases obviously,the web member of which decrease to the minimum value of 30 percent to 40 percent.The conclusion is that the perforated double tube buckling-restrained brace with simple structures and high energy dissipation has good damping effect on the double-layer reticulated shell in reasonable arrangement modes.更多还原