碳纤维增强复合材料筋混凝土框架结构动力性能试验研究

Experimental Research on Dynamic Properties of CFRP Reinforced Concrete Frame Structures

通过相似性分析计算,设计加工了比例为1∶4的碳纤维增强复合材料(CFRP)筋混凝土框架结构缩尺模型,开展了模拟地震振动台动力试验研究。采用4种不同强度的水平地震作用进行单向、双向以及三向地震波激励,测试结构模型的动力特性;通过结构在各级地震作用下的加速度、位移、内力等动力响应分析,探究了CFRP筋混凝土框架结构的抗震性能。结果表明:随着地震激励作用的增强,结构自振周期不断变长,从7度多遇地震作用到8度罕遇地震作用,X向增长54%,Y向增长60%,说明结构模型受到了不同程度的损伤,致使结构刚度不断退化,变形增大且出现局部混凝土压碎破坏。但结构模型在经历加速度峰值为0.788 g的罕遇地震作用后,仍未发生倒塌现象,且最大层间位移角值小于1/50,表明结构模型具有良好抗震性能,可以满足“小震不坏、中震可修、大震不倒”的抗震设防水准要求。

Through similarity analysis,the 1∶4 scale model of CFRP(carbon fiber reinforced plastics)reinforced concrete frame structure was designed and manufactured,and the dynamic test of simulated seismic shaking table was carried out.Unidirectional,bidirectional and tridirectional seismic excitation was applied to test the dynamic characteristics of the structural model.The seismic performance of the CFRP reinforced concrete frame structure was investigated by analyzing the dynamic response and hysteretic performance of the structure under different levels of earthquake,such as acceleration,displacement and internal force.The results showed that with the enhancement of seismic excitation,the natural vibration period of the structure kept getting longer increasing 54%in the X direction and 60%in the Y direction from seven-degree to eight-degree earthquake action,indicating that the structural model had been damaged to varying degrees,resulting in continuous degradation of structural stiffness,increasing deformation and partial concrete crushing failure.However,the structure model still did not collapse after experiencing the rarely accurred earthquake with the peak acceleration of 0.788 g,and the maximum inter-storey displacement angle was less than 1/50,indicating that the structure model had good seismic performance and could meet the seismic fortifying level requirements of“not bad in small earthquakes,repairable in medium earthquakes,and not falling in large earthquakes”.