唐代殿堂型木构架抗侧力性能影响参数分析

Parameter analysis on lateral force resistance of the palace-style timber building in Tang Dynasty

唐代殿堂型木结构是中国最早的木结构建筑遗存,具有极其珍贵的历史文化和科学研究价值。为深入研究此类木构架的抗侧力性能,建立了经模型试验验证的唐代殿堂型木结构单间四柱空间木构架精细化有限元模型,探究斗栱梁架一体化铺作层构造,柱脚管脚榫、柱头馒头榫等弱连接节点形式以及竖向荷载大小和位置对木构架滞回耗能及抗侧力性能的影响。结果表明:水平往复荷载作用下,唐代殿堂型木构架表现为摇摆抬升,其水平位移以柱架层的水平位移为主,滞回曲线呈“S”形,具有明显的“捏缩”效应,两端较饱满,正反接近对称。木构架初始抗侧刚度最大,随位移增大退化明显。铺作层为刚度较大的水平结构层,其横梁联系存在一定的冗余度。柱脚管脚榫及柱头馒头榫均可增强木构架的滞回耗能及抗侧力,但两者发挥作用的阶段不同。竖向荷载越大,木构架的滞回耗能越大,水平抗侧力也越大;其作用位置在一个柱径长度内偏移对木构架的滞回耗能及抗侧力性能无明显影响。

The palace-style timber building in Tang Dynasty is the earliest wooden structure remains in China,which has extremely precious historical and scientific research value.In order to further study the horizontal resistance of this kind of timber frame,the refined finite element model of single-room timber frame with four columns verified by model test was established,and the influences of brackets complexes,column head and column foot,load and position of vertical load on the mechanical performances of the timber frame were studied.The results show that the palace-style timber frame in Tang Dynasty swayed and uplifted under the horizontal reversed cyclic load,and its horizontal displacement was mainly the horizontal displacement of column frame layer,and the S-shaped hysteretic curve of the structure is anti-symmetric with pinch effect,which two ends are relatively full.The initial lateral stiffness of timber frame is the largest,and its degradation is obvious with the increase of displacement.The brackets complexes layer is a structural layer with high rigidity,and there is a certain redundancy in the connection between its beams.Both the column head and column foot can enhance the hysteretic energy dissipation and lateral force resistance of the timber frame,but they play different roles in different stages.The larger the vertical load is,the greater the hysteretic energy dissipation and the greater the lateral resistance are.The displacement of the action position within a column diameter length has no obvious effect on the hysteretic energy consumption and lateral force resistance of the timber frame.