中国古代木构建筑抗震机理及抗震加固效果的试验研究
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摘要
为探究中国古代大木作(带有斗的木构建筑)结构抗震机理和抗震加固的有效方法,对缩尺比为1/3.52二等材宫殿当心间模型在同样条件下分进行了模拟地震动的振动台试验研究,测试了模型结构加速度、速度和位移的动力时程响应;模型结构的自震频率和阻尼比。结果表明,古代大木作结构的抗震机理主要表现为两个方面:(ⅰ)因柱根滑移而隔震;(ⅱ)斗以及普柏枋因弹塑性变形和摩擦滑移消耗掉大量地震能以致结构减轻了震害。
In order to study the seismic mechanism and find out the effective antiseismic strengthen methods of China's ancient timber structure, Under the same conditions, a shaking table experiment of the ancient timber structure is carried out. The model is a central bay(whose mortisetenon joints has been strengthened or not) with a scale of 1/3.52 of Chinese ancient palace. Timehistory responses of accelerations?velocities and displacements of the model are measured, the frequency and the damping ratio of the model structure are also obtained. The results show that the antiseismic mechanism of Chinese ancient timber structure lies in two facts: (1) the sliding isolation earthquake of footings of the columns; (2) a amount of seismic energy is dissipated due to the condensation strain of Toukung and the friction slide of the Pupai fang, It plays a very important role in reducing seismic destruction of Chinese ancient timber structure.
In order to study the seismic mechanism and find out the effective antiseismic strengthen methods of China's ancient timber structure, Under the same conditions, a shaking table experiment of the ancient timber structure is carried out. The model is a central bay(whose mortisetenon joints has been strengthened or not) with a scale of 1/3.52 of Chinese ancient palace. Timehistory responses of accelerations?velocities and displacements of the model are measured, the frequency and the damping ratio of the model structure are also obtained. The results show that the antiseismic mechanism of Chinese ancient timber structure lies in two facts: (1) the sliding isolation earthquake of footings of the columns; (2) a amount of seismic energy is dissipated due to the condensation strain of Toukung and the friction slide of the Pupai fang, It plays a very important role in reducing seismic destruction of Chinese ancient timber structure.
引文
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