考虑节点刚度影响的典型广府木祠堂安全性分析

Safety Analysis of Typical Wood Ancestral Hall in Canton Considering Joint Stiffness

本文在考虑榫卯连接的半刚特性的基础上,对广府地区典型木祠堂进行整体结构安全性分析.具体工作包括,建立ABAQUS实体有限元模型,采用HILL木材本构模型,对广府木祠堂的典型榫卯连接节点进行弹塑性分析,获取节点刚度数值;建立SAP2000整体分析模型,考虑节点刚度的影响,对结构进行劣化分析.研究结果表明:实体有限元分析可定量地获得节点的M-θ骨架曲线,并将其拟合为三折线用于结构整体分析;节点刚度对整体结构的应力比及位移有较大影响;无劣化的古木建筑结构中的各杆件应力比均较低,但随着杆件的劣化,其安全度呈现出较明显的下降趋势;杆件单独劣化时,柱子劣化引起的应力比增大较梁为明显;所有杆件同时劣化时,边跨梁应力比最大.上述研究成果将为广府木结构的安全性评估提供依据,为修缮工程实践提供理论基础.

Considering the semi - rigidity of mortise - tenon connection, safety analysis is provided to the typical timbet Ancestral Hall in Canton. The research works include the elasto -plastic analysis for the typical mortise -tenon connection to get the value of joint stiffness, in which the ABAQUS solid finite element models are built and the HILL timber constitutive model is adopted, as well as the overall models degradation analysis, which are proceeded in SAP2000 ineorporating joint stiffness as above - mentioned. The results indicate that, firstly, M - θ curves of the joints stiffness can be quantitatively acquired by solid finite element, which can be fit to tri -linear curve for further structural analysis; secondly, the joint stiffness has significant effect on the stress ratio and displacement of overall structure; thirdly, although the stress ratios of ancient architectural structure＇ s members are relatively low without considering degradation, they increase obviously with the thermore, while beam and column degrade separately, the degradation of the members, thus the safety decreases; furstress ratio increase of column is more sensitive than that of beam, while all beams and columns degrade simultaneously, the side -beam＇s stress ratio increases most significantly. The authors hope to provide some evidence for safety assessment and some fundamental theory study for remedy for timber structure in this paper.