再生混凝土框架结构模型振动台试验

Experimental Study on Recycled Aggregate Concrete Frame Structure Model

摘要:

介绍了再生粗骨料取代率为100%的再生混凝土框架模型的振动台试验.对框架模型的自振频率、结构等效刚度、结构阻尼比、结构振型、加速度反应、位移反应进行了研究.分析表明，随着地震强度的增加，结构出现一定程度的破坏后，模型抗侧移刚度退化、自振频率随之下降、结构的阻尼比逐渐增大、加速度放大系数呈逐渐降低的趋势；采用层间变形作为评估指标，对再生混凝土框架的抗震能力进行了评估.经过多次地震试验后，尽管再生混凝土框架的破坏较为严重，但在1.170 g地震试验后仍然没有倒塌，表明再生混凝土框架结构具有良好的抗震能力.

Abstract:

A frame structure model which was made of recycled aggregate concrete (RAC) with 100% replacement of recycled coarse aggregates was tested on the MTS shaking table. The natural frequency, equivalent stiffness, the damping ratio, the vibration mode, the acceleration response and the displacement response and so on were analyzed and discussed. The result indicates that the damage of the RAC frame model develops progressively; the natural frequency descends; the lateral stiffness degrades; the damping ratio ascends and the acceleration amplifying factor decreases gradually with the increasing earthquake intensity. The inter storey drift was adopted as the index to evaluate the seismic performance of the RAC frame model structure. Although the model was subjected to very severe damage after several earthquakes, it did not collapse after 1.170 g test phase. The results show that the RAC frame buildings have good seismic resistance capacity.