秦氏旧宅厅堂木构架体系动力性能分析

Dynamic Performance Analysis of Qin's Old Dwelling Hall with Timber Frame

为了保护现存文物建筑并对其进行维修设计,以秦氏旧宅厅堂木构架建筑为研究对象,建立有限元模型并进行动力性能分析。采用模态分析探讨木构架体系的动力特性,对木构架进行罕遇地震作用下的动力时程分析。结果表明:结构第1阶振型的自振周期为2.112 7s,体现木构架建筑的长周期特性;纵向刚度小于横向刚度;节点刚度对结构振动模态影响显著;随着梁架层高度的增加,各梁架层的位移峰值随之增大;各梁架层加速度峰值随着梁架高度增加有减小的趋势,层间动力放大系数均在1左右;榫卯连接起到耗能减震的作用,其中七架梁层处的榫卯结构耗能效果最为显著;所得研究成果可为同类木构架体系的保护、修缮提供技术支持。

In order to protect and maintain the existing historic buildings, timber frame structure of Qin＇s Old Dwelling hall was taken as research object to establish the finite element model,dynamic performance analysis was done. Based on the modal analysis, the dynamic characteristic parameters of the timber frame were discussed. The dynamic time history analysis of timberframe under severe earthquake was carried out. The results show that the first natural vibration period of the structure vibration mode is 2. 112 7 s, which reflecting the long cycle characteristicsof timber frame building; longitudinal stiffness is weaker than lateral stiffness; the node stiffness has significant effect on the structure vibration modes. The peak displacement of each frame layerincrease with the increase of height, while the peak acceleration of each frame layer has a tendency to decrease with the increase of height; the dynamic magnification coefficients betweenframe layers are around 1; the connection joints between mortise and tenon have the effect of damping energy consumption, and the joints in the 7-purlin beam layer have the most significanteffect of energy dissipation. The obtained research results can provide technical reference for protection and maintenance of similar traditional dwellings with timber frame.