不同倾斜角度下平身科斗栱抗震性能研究

STUDY ON SEISMIC BEHAVIOR OF DOU-GONG BRACKET SETS BETWEEN COLUMNS UNDER DIFFERENT INCLINATIONS

  • 摘要: 为研究倾斜角度对斗栱抗震性能的影响,对3个沿面宽方向具有不同倾斜角度的足尺平身科斗栱进行了拟静力试验,分析了斗栱的破坏模式、滞回曲线、骨架曲线、刚度退化、位移延性及耗能能力。结果表明:倾斜与无倾斜斗栱破坏时栽销榫被剪断,大斗与平板枋发生相对滑移,斗栱整体转动。倾斜角度越大,大斗与平板枋间的滑移变形越大,而斗栱转动变形越小。沿斗栱倾斜向(正向)加载时,斗栱承载力和抗侧刚度随斗栱倾斜角度的增加而减小,沿斗栱倾斜反向(负向)加载时,斗栱承载力和抗侧刚度随倾斜角度的增加而增大。斗栱变形能力随斗栱倾斜角度的增大而降低,而耗能能力与倾斜角度无明显关系。建立了不同倾斜角度斗栱的数值计算模型,经试验验证两者吻合较好,在此基础上,进一步研究了竖向荷载、木材摩擦系数、弹性模量及其抗压强度以及构件分层倾斜对倾斜斗栱抗震性能的影响,结果表明:倾斜斗栱承载力和初始刚度随竖向荷载和木材摩擦系数的增加而增大,但受木材横纹径向弹性模量和横纹径向抗压强度的影响较小;构件分层倾斜斗栱的承载力和初始刚度低于整体倾斜斗栱。

     

    Abstract: To study the influence of inclination on the seismic behavior of the Dou-Gong, carried out is the pseudo-static test on three full-scaled Dou-Gong bracket sets between columns with different inclinations along the width direction. Analyzed are the failure mode, hysteretic curve, skeleton curve, stiffness degradation, displacement ductility, and energy dissipation ability of Dou-Gong. The results show that when the inclined and non-inclined Dou-Gong are failed, the Zaixiao-Tenon is sheared, the Capblock and Flat-Beam slip relatively, and Dou-Gong rotates as a whole. The larger the inclination, the greater the slip of Capblock and Flat-Beam, while the smaller the rotational deformation of the Dou-Gong. The bearing capacity and lateral stiffness of Dou-Gong decrease with the increase of the Dou-Gong inclination when Dou-Gong is loaded along the inclined direction (positive direction), while the bearing capacity and lateral stiffness of Dou-Gong increase with the increase of the Dou-Gong inclination when Dou-Gong is loaded against the inclined direction (negative direction). As the inclination increases, the deformation ability of the Dou-Gong decreases, while the energy dissipation ability has no obvious relationship with the inclination. The numerical calculation models of Dou-Gong with different inclinations are established and the simulated value agrees well with the test value. Based on the validated model, further studied are the influences of vertical load, wood friction coefficient, elastic modulus, compressive strength and layer inclination of component on the seismic behavior of the inclined Dou-Gong. The results show that the bearing capacity and initial stiffness of the inclined Dou-Gong increase with the increase of the vertical load and wood friction coefficient, but are rarely affected by the wood elastic modulus and compressive strength along the radial direction. The bearing capacity and initial stiffness of the component layer inclined Dou-Gong are lower than those of the overall inclined Dou-Gong.

     

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