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基于课题组前期有关性能增强再生混凝土(EC-RAC)基本材性、构件等试验结果,设计并制作了一缩尺比例为1:4的3层含有多种类再生混凝土的框架结构模型,并进行了双向模拟振动台试验研究,得到了该框架结构模型的自振频率、阻尼比、结构振型、加速度响应、位移响应、层间位移角等变化规律,结果表明:EC-RAC相较于普通RAC能够较好的控制裂缝的出现与发展,从而改善结构的延性,提高结构的整体抗震性能;随着地震烈度的逐渐增加,结构损伤累积,自振频率逐渐降低、阻尼比逐渐增大、加速度放大系数亦逐渐降低、位移幅值逐渐增大,同时位移幅值的曲线形式与结构第一振型相近,表明结构振动时以第一振型为主;模型经历了七度多遇至八度罕遇各地震作用后,层间位移角均未超过规范~[12]中所规定的1/50,上述试验结果均表明,所设计的RAC框架具有良好的抗震性能,完全满足规范~[12]中的要求。最后,参考《建筑地震破坏等级划分标准》、《建筑抗震设计规范》(GB 50011—2010)等文献,同时考虑各阶段试验现象,建立了能够应用于实际RAC结构震后破坏等级定量评估的5级划分。
Based on the test results of previous research on basic materials and components of EC-RAC, a three-layer frame structure model with multiple types of recycled concrete with a scale of 1: 4 was designed and fabricated. The results show that the EC-RAC has a better performance than the ordinary one. The results show that the EC-RAC has better performance than the normal one RAC can better control the emergence and development of cracks, so as to improve the ductility of the structure and improve the overall seismic performance of the structure. With the gradual increase of seismic intensity, the structural damage is accumulated, the natural frequency is gradually decreased, the damping ratio is gradually increased, and the acceleration The amplifying coefficient also gradually decreases and the displacement amplitude gradually increases. Meanwhile, the curve of displacement amplitude is similar to the first vibration mode of the structure, indicating that the vibration mode is dominated by the first vibration mode. After rare earthquakes, the drift angles of the layers did not exceed 1/50 as stipulated in the standard [12], and the above test results show that the designed RAC framework has good seismic performance Meet the specification to [12] in. Finally, considering the criteria of classification of building earthquake damage grade and GB50011-2010, taking into account the phenomena of various stages of the test, a quantitative assessment of the damage grade of the actual RAC structure is established. Divided.