屈曲约束支撑滞回性能的影响因素

为检验不同连接方式及构造方式对屈曲约束支撑滞回性能的影响,设计了螺栓连接和铰接2种连接方式,“十”字形、“T”形及“一”字形3种芯材截面形式,端部焊接型及中部切削型2种芯材制作方式,沿芯材纵向全长焊接及仅在工作段焊接2种组合方式共7个屈曲约束支撑试件。通过拟静力加载试验,分析了屈曲约束支撑的承载力、割线刚度、耗能系数及延性等变化规律。结果表明：7个试件的滞回曲线饱满稳定、耗能能力强;承载力、耗能系数及延性均随加载位移的增大而增大,割线刚度随加载位移的增大而降低,恢复力模型具有典型的双线性特征;连接方式及构造特性对屈曲约束支撑的滞回性能不产生明显影响,芯材材料性能、宽厚比、间隙与芯材厚度的比值是影响其滞回性能的主要因素。结果表明,两角钢具有协同的工作性能;提高焊接质量、增大限位卡附近过渡圆弧的曲率半径分别是增强两种类型屈曲约束支撑稳定滞回的主要工艺及构造措施。

Influencing factors of buckling-restrained brace hysteretic performance

Seven buckling-restrained braces were designed to verify the influence of different connection modes and structure modes on hysteretic behavior of buckling-restrained brace.They include two connections of the bolt connection and the articulated connection, three kinds of core material section form of "Ten" glyphs, "T" shape "and" one "glyph, two kinds of core material production method of end welding type and middle cutting type, and two combinations way of along the core material longitudinal full-length welding and only in the working section welding. In this paper, the load capacity, secant stiffness, energy dissipation coefficient and ductility of buckling constrained support are analyzed by the quasi-static loading test. The tests results show that the hysteretic curves of 7 specimens are full and stable,with energy dissipation ability, and the bearing capacity, energy dissipation coefficient and ductility increase with the increase of load displacement, and the secant stiffness decreases with the increase of load displacement. The restoring force model is of the typical bilinear characteristics and the connection mode and the structural characteristics possess no obvious effect on the hysteretic performance of buckling constrained support. The ratio of material properties, generosity and clearance and thickness of the core material are the main factors influencing the hysteretic performance. The results show that the two angles have synergistic work performance. Improving welding quality and increasing the radius of curvature of the transition arc near the limit card are the key factors to enhance the hysteretic performance of the end welded and the central cutting buckling constrained support.