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基于规范[1-2],对某动力基础阻尼比进行了测试及计算。数值处理结果表明,在自由振动和强迫激励作用下,阻尼比测试数值与弹性半空间近似公式及规范推荐近似公式的结果存在较大差别。为此提出了利用基础表面若干测点的3向振动时程合成基础质心6自由度时程,并以该时程曲线作为地基动力参数的测试依据。在此基础上,建议相关规范应推荐在某些重要基础建造时,在基础底面适当位置预埋传感器,以基础底面振动测试数据作为地基阻尼比等动力参数的计算依据更为准确。
Based on the specification [1-2], a dynamic foundation damping ratio was tested and calculated. The numerical results show that there is a big difference between the numerical results of the damping ratio test and the approximate formulas of the elastic half-space and the approximate formula of the standard recommendation under free vibration and forced excitation. For this reason, a 6-DOF time-history of the basic centroid is synthesized by using 3-way vibration time history of several measuring points on the base surface, and the time history curve is taken as the test basis of dynamic parameters of the foundation. On this basis, it is suggested that the relevant norms should be recommended to embed sensors at proper positions on the base bottom during certain important infrastructures. It is more accurate to calculate the dynamic parameters such as foundation damping ratio based on the vibration test data of the base bottom.