白居塔塔体结构稳定性分析研究

Analysis and research on the structural stability of Baiju Tower

在对白居塔建筑形制调查研究基础上,区分塔体内嵌高山体和内嵌低山体两种情况,确定重力作用以及重力和地震耦合作用两种工况。基于采用岩土摩尔—库伦本构模型的有限元分析技术,对白居塔和山体的耦合结构进行稳定性分析。得出以下结论:自重作用下,整体结构稳定性满足,且有较高的安全稳定系数;白居塔整体结构的刚度较大,整个结构体系属于抗震有利体系;白居寺整体结构基频模态以侧倾为主;在7°(基本加速度0.15 g)多遇地震作用下,两个模型整体结构的抗震稳定性较好,结构不会产生整体性失稳破坏;在8°(基本加速度0.3 g)多遇地震作用下,较高山体模型主体结构基本处于安全状态,较低山体模型主体结构不满足稳定要求;较高山体的模型相对于较低山体的模型,安全稳定性要高。

Based on the investigation and study of the architectural form of Baiju Tower,we analyzed the stability of its coupled structure with both mountain body distinguishing the two situations of tall and low mountain body embedded in the tower body under gravity action and gravity and seismic coupling conditions respectively,on the basis of the Mohr-Coulomb constitutive model of rock and soil and finite element analysis technology.The following conclusions are drawn:under the action of self-weight,the overall structure safety satisfies with a high safety and stability coefficient;the stiffness of Baiju Tower is high,and the whole structure system belongs to the aseismic favorable system;the basic frequency mode of the whole structure of Baiju Temple prefers inclined model;under the action of 7 degrees(basic acceleration 0.15 g),the seismic stability of the two models is good;the main structure of the higher mountain model is basically in a safe state under 8 degree(basic acceleration 0.3 g)earthquakes,and that of the lower mountain model does not meet the requirements of stability;the model of the higher mountain body has higher safety level and stability than that of the lower mountain body model.