累积残损变形对古建筑木结构力学性能的影响

Compared with the modern buildings, the ancient timber structures have distinctive features in details of structure and the load-transferring mechanism. Most of ancient architectures experienced erosion of the bad natural environment for a long time, and different degree of the cumulative deformation damages have appeared. It is necessary to evaluate their mechanical properties and to provide the adequate structural protection against the environment. In the proposal of the project, literature research, field investigation, theoretical analysis, numerical simulation, laboratory and field tests, the safety limit assessment and other scientific methods are used to study the changes of mechanical properties of ancient timber structures subjected to the cumulative deformation damages. The deformation characteristics and mechanism of components and joints are obtained. The variation rules of the mechanical properties of the beams, the columns and the typical joints under the influence of the cumulative deformation are given. Fine mechanics models of the damaged joints and the deformed components are established, and identification analysis and evaluation method of structure damage state are studied. Based on the distinctive mechanical behavior, the method of the performance evaluation of safety limit of ancient structures is carried out under the permanent loads and strong earthquake. It provides a scientific basis for the protection of the ancient timber structures.

木结构古建筑在结构构造、传力机制方面与现代建筑相比具有显著的独特性，其大多经历了长久的恶劣自然环境的侵蚀，存在不同程度的累积残损变形，对其进行有效的力学性能评估与结构保护十分必要。本项目拟采用文献调查、现场勘察、理论分析、数值模拟、试验与现场测试、安全极限评估等科学手段，对累积残损变形下的古建木结构的力学性能变化进行系统深入的研究，获得木结构构件变形和节点变形的特征和机理；掌握累积变形影响下典型节点以及不同杆端支承条件下梁、柱构件的力学性能变化规律，建立反映节点和构件残损的精细化力学模型，研究结构损伤状态的识别分析与评估方法；基于残损现状的构件和节点的传力特征，考虑永久荷载和强震作用，研究结构整体的安全极限性能评估方法，为典型古建木结构的保护提供科学依据。

木结构古建筑在结构构造、传力机制方面与现代建筑相比具有显著的独特性，其大多经历了长久的恶劣自然环境的侵蚀，存在不同程度的累积残损变形，对其进行有效的力学性能评估与结构保护十分必要。. 本项目采用了文献调查、现场勘察、理论分析、数值模拟、试验与现场测试、安全极限评估等科学手段，对累积残损变形下的古建木结构的力学性能变化进行了系统深入的研究，获得了木结构构件变形和节点变形的特征和机理；揭示了累积变形影响下典型节点以及不同杆端支承条件下梁、柱构件的力学性能变化规律，建立了反映节点和构件残损的精细化力学模型，研究结构损伤状态的识别分析与评估方法；并且基于残损现状的构件和节点的传力特征，考虑永久荷载和强震作用，研究了结构整体的安全极限性能评估方法，为典型古建木结构的保护提供科学依据。. 以本项目为依托，共培养毕业研究生7名，发表期刊论文13篇，其中SCI收录期刊论文1篇，EI收录期刊论文9篇，获得发明专利和实用新型专利各1项。本项目的实施，为残损状态下木结构性能研究提供了新的设计思路和方法，研究成果必将对提高古建筑木结构状态评估水平、推动科技保护文物的发展起到重要的指导和促进作用。