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通过节能砌块隐形密框结构3层楼房1/2模型振动台试验,用白噪声测定了各工况下结构的动力特性,并分析了其变化规律。结果表明:结构的刚度较大,在振动台输入峰值加速度达到0.82g时,模型结构基本上仍处于弹性阶段,结构自振频率没有急剧下降,结构的耗能性能较好,初始阻尼比较高。随着输入峰值加速度的上升,内部裂缝发展,结构的自振频率逐渐下降,周期逐渐增大,阻尼有所增长。
The dynamic characteristics of the structure under various working conditions were measured by white noise and the variation regularities were analyzed. The results show that the stiffness of the structure is large. When the input peak acceleration reaches 0.82g, the model structure is basically still in the elastic phase. The natural frequency of the structure does not drop sharply. The energy dissipation performance of the structure is better and the initial damping ratio is higher. With the increase of the input peak acceleration and the development of internal cracks, the natural frequency of the structure gradually decreases, the period gradually increases, and the damping increases.