双矩管装配式防屈曲支撑螺栓设计理论研究

装配式防屈曲支撑的外围约束构件主要通过高强螺栓连接形成整体,螺栓的布置及直径选取直接关系到外围构件是否能有效约束内核构件的侧向变形。为此,该文在双矩管装配式防屈曲支撑外围约束构件刚度取值及其设计方法较完善的前提下,通过考虑外围约束构件的螺栓布置间距、内核多波变形波长以及因外围约束构件板件局部变形引起的撬力影响来确定跨中螺栓内力;此外,还提出了端部螺栓的内力计算公式及端部螺栓加强方案,完善了双矩管装配式防屈曲支撑螺栓设计理论。

THEORETICAL STUDY ON BOLT DESIGN METHODS FOR DOUBLE RECTANGULAR TUBE ASSEMBLED BUCKLING-RESTRAINED BRACE

The external restraining members of assembled buckling-restrained braces(ABRB) are assembled by high strength bolts, and the layout and dimension of the bolts are closely related to how efficient they are when an external member restrains the lateral deformation of a core member. Given such facts, and based on the studies of the restraining stiffness and design method of external restraining members for a double rectangular tube ABRB, this study focuses on the internal force of the mid-span bolt considering the effects of the bolt arrangement in an external member, the core wavelength of core multi-wave deformation, and the prying force resulting from the local deformation of plates of the external member. Besides, the calculation formula of internal forces and the local strengthening recommendation of end-bolts are also put forward. As a result, the design method for the bolts applied in a double rectangular tube ABRB has been improved.