不同方法加固古建筑榫卯构架抗震试验

为保护古建筑,采用试验方法,研究了不同方法加固榫卯节点后木构架的抗震性能。基于故宫太和殿某开间梁柱节点的具体尺寸,制作了1:8比例的4梁4柱木结构空间框架模型,其中梁和柱考虑为燕尾榫形式连接。采用人工加载方式,进行了低周反复加载试验,研究了马口铁、CFRP布和钢构件加固榫卯节点后对木构架抗震性能的影响。基于试验结果,获得了加固前后构架的力-侧移滞回曲线和骨架曲线,分析了构架耗能能力、刚度退化规律及变形能力,对不同方法加固木构架的抗震效果进行了对比,对其工程应用提出了建议。

An ExperimentalStudy on Aseismic Behaviors of Chinese Ancient Structure Strengthened by Different Methods

To protect Chinese ancient buildings, experiments were conducted to analyze aseismac behaviors ot Chinese ancient wooden structures strengthened on tenon-mortise joints by different methods. Based on actual sizes of an ancient building in the Forbidden City, wooden frame models with a scale of 1：8 of the prototype structure were built with a swallowtail pattern of tenon- mortise joints. By means of manual loading, low cyclic reversed loading tests were carried out to study aseismic behaviors of the models after their tenon-mortise joints were strengthened by iron hook, CFRP sheets （Carbon Fibre Reinforced Plastic）, and steel components, respectively. Nine tests were conducted, including three tests for unstrengthened models, two tests for each strengthening method mentioned above. With the experiments, load-displacement hysteretic curves and skeleton curves of the models were obtained; their energy dissipation capability, stiffness degradation and deformation performance were studied; application range of each method was compared. Results show that the wooden models have good deformation performance both before and after being strengthened on tenon-mortise joints. Detailed orders of the performance with particular strengthening method are shown as follows：bearing capability