外挂微晶发泡板轻钢框架结构振动台试验

Shaking table test of a light steel frame structure with micro-crystalline foam plates

摘要:

为研究外挂微晶发泡板轻钢框架结构在动力作用下的工作性能,进行了1个2层单跨轻钢框架外挂微晶发泡板足尺模型的振动台试验.试验选取了EL-Centro、Taft、张家口人工波3条地震波,地震加速度考虑8度多遇到9度罕遇.通过分析模型结构的自振周期、刚度、楼层加速度以及楼层位移,研究了外挂微晶发泡板轻钢框架结构的振动特性,对微晶发泡板的工程应用给出了建议.试验研究表明:在9度罕遇地震下,轻钢框架结构与外挂墙板龙骨基本无破坏,仅墙板表皮有脱落现象,部分墙板发生平面外扭转；采用微晶发泡板与框架间相对错动的装配连接方式,可一定程度上减小结构的层间位移；墙板开设较大门窗洞时,该方向刚度虽有较大退化,但在9度罕遇地震作用下无倒塌危险,能够满足大震不倒的抗震设防要求；相邻墙体之间的预留缝需要添加柔性材料改善相邻墙体间的撞击挤压现象.

Abstract:

In order to investigate the dynamic performance of a light steel frame structure with micro-crystalline foam plates, a shaking table test of a two-story single-span light steel frame with micro-crystalline foam plates was carried out. Three seismic waves, EL-Centro, Taft, and Zhangjiakou artificial wave, were selected in the test. The intensity of seismic ground motion range from 8 to 9 degrees. The structure vibration performance was analyzed through analyzing the structural natural period, stiffness, floor acceleration, and floor displacement. Suggestions for further engineering application of the structure were given. The experimental results show that under the action of seismic intensity of 9 degree, the internal light steel frame and wallboard skeletons were almost undamaged, except for the partial peeling-off of the wallboard skin and the out-of-plane torsion of some wallboards. The connection mode of the micro-crystalline foam plate and the frame could produce relative dislocation, which could reduce the inter-story displacement of the structure to a certain extent. The X-direction horizontal stiffness of the structure had a large degrade. However, there is no danger of collapse under the action of rare earthquake with seismic intensity of 9 degree, which can meet the seismic resistant requirements for large earthquakes. Flexible materials are needed to add to the reserved joints between adjacent walls to improve the impact and extrusion phenomenon between adjacent walls.