摘要
目的:研究内核外伸的铰接防屈曲支撑的受力状况。方法:在假定内核对外围约束构件挤压力分布模式后,建立内核外伸加强段和约束加强段的平衡方程,并结合内核与外围约束构件之间的变形协调关系求解出内核外伸段上最不利弯矩、内核挤压力及外围约束构件上的弯矩分布。基于外围约束构件及内核外伸加强段的受力特点建立外围约束构件设计准则和内核加强段设计准则。结论:设计准则可以有效地预测支撑整体失稳破坏和内核外伸加强段折曲破坏。
The contact force distribution between the core member and the external member of a buckling-restrained brace （BRB） is closely related to its deformation mode, and it directly affects the working state of the extended core and external restraining member. This study focuses on a pinned BRB with extended core as a research object and investigates the stress state of a BRB. Based on the specified core deformation modes and contact force distributions, the contact force and the bending moment distribution in the external member are deduced. Lastly, by considering the mechanical characteristics of the external member and extended strengthened core region （ESCR）, their strength design criteria are established. In the theoretical deriva- tion of the design method, the influence of some parameters is considered, including the initial geometrical imperfection of the external member, the gap between the core and the external member, the rigidity reduction of the restrained strengthened core region （RSCR）, and the change of contact position. Finite element numerical verification of the corresponding theoretical derivation is discussed in detail in another paper as Part II （Jiang et al., 2015）.
基金
supported by the National Natural Science Foundation of China(No.51178243)
关键词
防屈曲支撑
内核单波整体变形
挤压力分布
内核构件加强段
设计准则
External integrated buckling-restrained brace （BRB）, Core single-wave overall deformation, Contact force distribu-tion, Strengthened core region （SCR）, Strength design criteria
