摘要
轻型木结构在地震作用下的性能已有了一定的研究基础,但轻木混合结构的抗震性能研究尚未得到充分认识。本文重点介绍了首次进行的3层轻木-混凝土混合结构振动台试验,试验房屋下部一层为钢筋混凝土框架结构,上部二层为对称轻型木结构,模型平面尺寸为6.1m×3.7m。对5个上下抗侧刚度比不同的足尺模型,采用3种地震动沿房屋纵向激振,峰值加速度依次为0.1g^0.5g。每次激振后测定房屋自振频率及对应的阻尼,各层加速度和水平位移,木结构底部与混凝土结构顶部之间竖向相对位移以及螺栓锚固力等。试验结果表明:(1)轻木-混凝土混合结构具有良好的抗震性能;(2)上部木结构与底层混凝土结构间连接可靠;(3)5个模型的振动均以第1振型为主,但对于刚度比大的模型,下部混凝土结构的2阶振动较明显;(4)刚度比大的模型其地震反应小于刚度比小的模型。
When there is a relatively large body of technical information on the seismic performance of wood-frame buildings to resist seismic ground motions, the quantitative assessment of seismic resistance of wood hybrid is less well understood. In this paper, the shaking table tests of full-scale wood hybrid buildings are reported. The 3-storey specimen, 6.1 m×3.7m in plan, consisting of a symmetric two-storey wood-frame structure on top of a one-storey concrete frame. A total of five different structural configurations representing different stiffness ratios between the wood-frame structure and concrete frame were tested. Shaking was applied in the longitudinal direction by three earthquake ground motions applied successively at peak acceleration levels of 0.1 g to 0.5g. The natural frequencies and damping of integral structure were detected before and after each excitation. The accelerations and displacements at every floor, as well as the anchorage forces and uplift displacements between upper wood structures and lower concrete frames were recorded. Based on these test results, some conclusions are drawn that： （ 1 ） Models show good performance to resist seismic excitation up to 0.5g. （2）The anchor bolts connections between concrete and wood structure are reliable. （3） The first mode vibrations type is dominant in each of five models, but the second mode vibration is visible in concrete frame with large stiffness ratio. （4） Displacement response of model with larger stiffness ratio is not so strong as that with smaller ratio under ground motion.
出处
《地震工程与工程振动》
CSCD
北大核心
2008年第1期91-98,共8页
Earthquake Engineering and Engineering Dynamics
基金
中国-加拿大科技合作项目(20061101)
