中国古代木结构建筑榫卯节点抗震试验研究
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摘要
作为木结构古建筑损坏的主要部位,榫卯节点是研究木结构体系的关键。通过对5榀按照清代工部《工程做法则例》制作的宫殿式木构架模型,以及2榀胶入钢筋和3榀碳纤维布加固榫卯节点的木构架模型在水平反复荷载作用下的试验研究,得到了未加固构架、胶入钢筋加固构架以及碳纤维布加固构架的破坏形式、滞回曲线、变形及刚度退化等性能。试验表明:木结构具有很好的变形能力,柱头水平侧移为120mm;未加固构架与加固构架的破坏为榫卯节点的脱榫,榫头和卯口均产生明显的挤压变形,梁、柱构件没有损坏;胶入钢筋加固、碳纤维布加固与未加固构架的的滞回曲线有明显的不同;水平反复荷载作用下,胶入钢筋加固和碳纤维布加固构架强度、刚度明显增加,加载后期,加固效果逐渐减小,其滞回曲线形状逐步接近未加固构架。
The mortise-tenon joints which are destroyed easily are the keys to study ancient Chinese timber structure system.Ten timber frame models,including five non-reinforced models made with the requirements of the Gongcheng Zuofa of Qing Dynasty,two models strengthened with Glued-in Bolts,and three models strengthened with carbon fiber reinforced polymer(CFRP) sheet were tested by low-cyclic reversed loading.The behaviors of timber frame models,such as the failure forms,hysteresis curves,deformation and degeneration of rigidity,are analyzed.The test results indicate that the timber frame structures exhibit good deformation behavior,and the horizontal displacement is 12 cm.The separation between mortise and tenon leads to the destruction of the timber models,squeeze deformation occurs in mortise and tenon,and the beams and columns are intact.The hysteresis curves of strengthened timber frame models are apparently different from that of non-reinforced models.The strength and rigidity of the strengthened models are higher than those of the non-reinforced models.In the late loading,the capacity of the strengthening is weakened gradually,and the hysteresis curves are close to that of non-reinforced models.
The mortise-tenon joints which are destroyed easily are the keys to study ancient Chinese timber structure system.Ten timber frame models,including five non-reinforced models made with the requirements of the Gongcheng Zuofa of Qing Dynasty,two models strengthened with Glued-in Bolts,and three models strengthened with carbon fiber reinforced polymer(CFRP) sheet were tested by low-cyclic reversed loading.The behaviors of timber frame models,such as the failure forms,hysteresis curves,deformation and degeneration of rigidity,are analyzed.The test results indicate that the timber frame structures exhibit good deformation behavior,and the horizontal displacement is 12 cm.The separation between mortise and tenon leads to the destruction of the timber models,squeeze deformation occurs in mortise and tenon,and the beams and columns are intact.The hysteresis curves of strengthened timber frame models are apparently different from that of non-reinforced models.The strength and rigidity of the strengthened models are higher than those of the non-reinforced models.In the late loading,the capacity of the strengthening is weakened gradually,and the hysteresis curves are close to that of non-reinforced models.
引文
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