摘要
主要对按照宋代《营造法式》构造要求制作的古建筑木结构实体加固模型进行模拟振动台试验。选用三条地震波分别对结构模型的柱根、柱头、铺作、乳栿的位移、加速度响应、地震剪力以及榫卯节点的内力进行定量研究,并对结构的破坏形态、动力特性、扭转效应进行定性分析。研究结果表明:柱础的摩擦滑移、半刚性榫卯节点的转动以及枓栱铺作层的滑移使得结构模型地震响应大幅度减小,满足"小震不坏、中震可修、大震不倒"的设计要求;结构模型最大剪力沿高度的分布出现在柱架层或柱础层,并非一定出现在结构的柱础最低层;得出榫卯节点不同工况下的转动弯矩最大值;由于高振型的参与以及质量和刚度不均匀分布,结构模型在400Gal后出现明显的扭转。
A shaking table test of a model of an ancient timber structure, constructed according to the Fabrication Methods of Song dynasty and strengthened with CFRP, was conducted. Quantitative analyses were performed for the displacement and acceleration response of the root, the head of column, Shop Aung, Ru Fu, the earthquake shear of structure and the internal force tenon-mortise node, failure pattern, dynamic property, and torsional effect. The study showed that the friction-sliding of pedestal, rotation of semi-rigid tenon-mortise node and sliding of Shop Aung greatly decreased the dynamic response of the structure, and met the design requirements of no damage under frequent earthquakes, repairable under moderate earthquakes and no collapse under rare earthquakes. Maximal shear force of the structure distributed along the height appeared in the column frame layer or the pedestal, and the maximal bending moment of tenon-mortise node under different conditions was also obtained. Due to the participation of high vibration model and non-uniform distribution of mass and stiffness, there was obvious twist beyond 400Gal.
出处
《土木工程学报》
EI
CSCD
北大核心
2012年第11期95-104,共10页
China Civil Engineering Journal
基金
国家自然科学基金(59878043
51108373)
国家文物局文物保护科学和技术研究课题(20110123)
陕西省自然科学基础研究计划项目(98C09)
长江学者和创新团队发展计划资助项目
陕西省重点学科建设专项资金(E01001)
关键词
古建筑
木结构
碳纤维布
加固
振动台试验
抗震性能
ancient building
timber structure
CFRP
strengthening
shaking table test
dynamic property
