论文部分内容阅读
为保护古建筑,采取数值模拟方法,以四川广元某穿斗式木结构古建筑为例,研究了嵌固墙体对古建筑木结构抗震性能的影响。采用ANSYS有限元分析程序,建立了该古建筑的2种有限元模型:仅考虑木构架抗震性能;考虑墙体与木构架接触作用后结构整体抗震性能。通过模态分析,获得了两种模型的基频和主振型。通过时程分析,获得了各模型典型节点的位移和加速度响应,讨论了嵌固墙体对结构整体的抗震性能影响。结果表明:未考虑墙体嵌固作用时,结构的基频为f=1.38Hz,x向振型以第1阶为主,y向振型以第2阶为主;与当考虑嵌固墙体的影响时,结构的基频为f=1.59Hz,主振型以x向的第一振型为主,且与古建筑实际震害相符。此外,考虑墙体嵌固作用时,地震作用下,木构架表现为更小的位移响应及更大的加速度响应。
In order to protect the ancient buildings, a numerical simulation method is adopted to take an ancient building with through-the-bucket wooden structures in Guangyuan, Sichuan as an example to study the influence of embedded walls on the seismic performance of ancient buildings. ANSYS finite element analysis program was used to establish two kinds of finite element models of the ancient building: only considering the seismic performance of the timber frame; considering the overall seismic performance of the structure after the contact between the wall and the wooden frame. Through modal analysis, the fundamental frequencies and the main modes of the two models are obtained. Through the time-history analysis, the displacement and acceleration responses of typical nodes of each model are obtained, and the influence of embedded wall on the seismic performance of the whole structure is discussed. The results show that the fundamental frequency of the structure is f = 1.38Hz, the first order is the x-direction mode, and the second-order mode is the y-direction mode. When the embedded wall is considered, The fundamental frequency of the structure is f = 1.59Hz. The main mode is dominated by the first mode of x-direction, and is consistent with the actual earthquake damage of ancient buildings. In addition, considering the effect of wall embedding, the wood frame shows smaller displacement response and larger acceleration response under earthquake action.