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榫卯節點是木構古建梁柱連接的典型形式

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點擊次數:3698 更新時間:2021年06月24日00:54:09 打印此頁 關閉

      榫卯節點是木構古建梁柱連接的典型形式,節點的受力性能對木構架整體穩定性有著重要影響。為保護古建筑,采用數值模擬方法,以抬梁式木構古建的兩種典型榫卯節點形式—直榫和燕尾榫為例,研究了彎矩作用下榫卯節點的破壞形式及破壞特征?;趦煞N榫卯節點的典型構造特征,建立了受彎荷載作用下的有限元模型。通過在梁側面施加逐步增大的位移荷載(共10mm)來研究兩種節點的拉、壓、剪應力分布特征及節點的彎矩-轉角關系,獲得了節點在不同加載值的相應內力峰值及轉角剛度變化情況。結果表明:在彎矩荷載作用下,直榫的榫頭容易產生拉、壓、剪破壞,而卯口相對不易產生破壞;而燕尾榫榫頭與卯口都容易產生拉、壓剪破壞,且破壞程度比直榫嚴重;另一方面,燕尾榫節點的轉動剛度要大于直榫,因而不易產生轉動,一旦發生轉動,其破壞的可能性要大于直榫節點。 

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