木构架-减震土坯墙的构造与机理研究

RESEARCH ON CONSTRUCTION AND MECHANISM OF TIMBER FRAME WITH ADOBE WALL

  • 摘要: 为解决村镇木构架结构中存在的土坯墙易遭受地震破坏的问题,该文提出了一种适用于木构架的新型减震土坯墙体系,该新型体系能够避免或降低传统木构架结构中土坯墙的地震损伤,并有效减小土坯墙对木构架所带来的过强约束效应和附加刚度。为揭示木构架减震土坯墙结构的减震机理与抗震性能,运用有限元分析软件ABAQUS分别建立一榀木构架、木构架-普通土坯墙和木构架-减震土坯墙的实体模型,对比分析三者的滞回曲线、骨架曲线、刚度退化、耗能能力和墙体变形损伤等。结果表明:木构架-减震土坯墙的耗能能力较木构架结构有显著提升。其中,减震土坯墙与普通土坯墙相比对木构架的附加刚度与约束效应明显减小,在大位移工况下减震土坯墙可避免墙体破坏。此外,减震土坯墙与木构架的连接件构造合理,可有效保证该体系的减震工作机理。

     

    Abstract: To solve the problem that the adobe walls in rural timber structures are susceptible to earthquake damage, this paper proposes a novel damping adobe wall system designed for timber frames. By significantly reducing the excessive constraint effects and additional stiffness imposed by adobe walls, the system effectively alleviates seismic damage to adobe walls and enhances the seismic performance of the integrated structure. To investigate the damping mechanism of the timber frame-damping adobe wall structure, three specimens including a bare timber frame (TF), a timber frame-conventional adobe wall (TF-CAW), and a timber frame-damping adobe wall (TF-DAW) are constructed in the finite element software ABAQUS. Comparative analysis is then carried out focusing on their hysteresis curves, envelope curves, stiffness degradation, energy dissipation capacity, and wall damage deformation. The results show that the energy dissipation capacity of the timber frame with damping adobe walls is significantly higher than that of the bare timber frame. In addition, compared with conventional adobe walls, the damping adobe walls impose substantially lower additional stiffness and constraint effects on timber frames, effectively preventing wall damage under large displacement loading cases. Moreover, the connectors between the damped adobe wall and the timber frame are structurally reasonable, which can effectively ensure the working mechanism of the timber frame-damping adobe wall system.

     

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