典型宋式斗栱试验骨架曲线特征和滞回性能分析

Analysis of the skeleton curves characteristics and hysteretic performance of typical song style brackets sets

古木结构建筑遗产具有极高的历史、文物、艺术和科学价值,其地震安全性能评估工作亟待开展。斗栱是我国古木结构建筑中特有的构件,其受力性能是研究的重点难题。对4种、27个典型宋式斗栱试验数据进行了收集整理分析,明确了影响斗栱骨架曲线和耗能能力的关键因素。研究结果表明:(1)不同类型的斗栱在骨架曲线和破坏模式上有不同的表现;(2)不同的水平荷载加载方向对同一种斗栱的承载力和耗能能力有较大影响,叉柱造柱头铺作华栱向的承载力要比泥道栱向高33.77%;(3)竖向荷载大小对斗栱的刚度和承载力有一定影响,竖向荷载越大,斗栱的刚度和承载力越大;(4)同一种斗栱不同营造形式对其受力性能有不同程度的影响。研究成果可为古木建筑遗产的抗震性能评估提供重要参考。

Architectural heritage of ancient timber structure has high historical,cultural,artistic and scientific value,hence,the assessment of correspondingly seismic performance is required to be conducted urgently.Brackets set is a unique component of ancient wooden structures in China.The experimental data of 27 Song style brackets sets with emphasis on 4 typical types is herein summarized and analyzed,the key factors affecting brackets sets skeleton curve and energy dissipation capacity are identified.The results show that:(1)the skeleton curves and failure modes of different types of brackets sets are different;(2)different horizontal loading directions have a great influence on the bearing capacity and energy dissipation capacity of the same brackets sets,the Chazhuzao Zhutou Puzuo’s bearing capacity of Hua gong direction is 33.77%higher than that of Nidaogong direction;(3)the vertical load has a certain influence on the stiffness and bearing capacity of the brackets sets,the larger the vertical load is,the greater the stiffness and bearing capacity of bucket.;(4)different forms of construction of the same brackets sets have different effects on their mechanical properties.The research outcomes of this paper can provide important reference for the seismic performance evaluation of ancient wooden structure heritage.