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装配式防屈曲支撑的外围约束构件之间通过高强螺栓连接,其连系螺栓的离散性布置对各外围约束构件形成的整体约束刚度有不利的影响,需要在外围构件约束刚度计算中考虑。该文对一种双矩管装配式防屈曲支撑的外围约束刚度取值进行了研究,在理论推导中首先假定外围约束构件为“空腹桁架模型”来考虑离散螺栓连接,而后运用“连续连杆法”将螺栓的离散作用连续化以便于考虑这种不利作用。通过研究“空腹桁架模型”的变形特性考虑外围约束构件约束刚度的折减,最后结合对外围构件受力机理的分析及数值手段,推导并拟合出约束构件分肢间连系刚度,进而完善了外围约束刚度取值的相关理论。提出的方法也得到了数值分析的验证。
The peripheral restraining members of the assembly type buckling brace are connected by high-strength bolts, and the discrete arrangement of the connecting bolts adversely affects the overall restraining rigidity of each peripheral restraining member and needs to be considered in the calculation of the restraining stiffness of the peripheral components. In this paper, we study the value of the external restraint stiffness of a kind of double-tube-mounted buckling brace. In the theoretical derivation, we first assume that the external restraining element considers the discrete bolt connection as the “fasting truss model” and then uses the “ Continuous link method ”The continuous dispersion of bolts in order to consider this adverse effect. By considering the deformation characteristics of the “empty web truss model”, considering the reduction of the restraining stiffness of the peripheral restraining members, the stiffness of the constraining members is deduced and fitted based on the mechanics analysis and numerical means of the peripheral members. And then improve the peripheral constraint stiffness value of the theory. The proposed method has also been verified by numerical analysis.