古建木结构榫卯连接的扁钢加固试验

通过比例为1:3.52的古建木结构模型振动台试验,研究了用Q235扁钢加固榫卯连接节点的加固性能及效果.对模型加固前后的加速度、位移时程响应、自振频率和阻尼比进行了对比分析.结果表明加固后结构刚度略有提高,但符合刚度等效的加固原则,榫卯结构耗能转变为主要依靠扁钢屈服后塑性变形耗能,有效阻止了结构榫卯节点的破坏.从而验证了榫卯连接的扁钢加固方案是可行的,可为古建筑木结构抗震加固提供一种方法.

Experimental studies on seismic characteristic of strengthened mortise-tenon jointin historical timber buildings

A model was set up according to the actual historical timber building with a scale of 1/3.52 of the prototype structure whose mortise-tenon joints had been consolidated or not.The shaking table experiments were carried out.The dynamic characteristics and the change rules of frequency and damping ratio were tested,and seismic responses of the model were obtained.By comparing and analyzing the characteristics,it is shown that the stiffness change of the strengthened mortise-tenon joint model is consistent with the primary model on the whole while the stiffness is increased little.At the same time,the energy dissipation depends on the yield plastic deformation of the armor plate instead of the structure collapse with mortise-tenon.The consolidation scheme is proved to be a useful method for repairing and reinforcing the historical timber buildings.