Fundamental Study on Vibration Test of Building Structure Using Impactor Machine

研究建筑物-地基系统的振动特性，并根据其振动特性的变化来评估建筑物的破坏程度，在地震工程中具有重要意义。本研究利用地质反射测量中使用的陆地气枪冲击器，对实际建筑物-土壤系统在冲击载荷下的振动特性进行了研究，并与正弦波下的振动特性进行了比较，在1999年度对冲击器产生的波的基本特性进行了研究。研究了其衰减特性，证实了其互易性。在数据处理中，采用叠加技术提高信噪比。在东北大学的实际SRC大楼中进行了冲击试验。研究了其振动特性，并与1998年9月15日仙台近源地震的振动特性进行了比较。2000年度，在东北大学的同一栋建筑物内，使用不平衡质量型激振器进行了强迫振动试验。正弦波的振动特性进行了比较与冲击试验。发现共振和相位滞后曲线与冲击器测试结果一致。利用框架模型对试验结果进行了模拟分析。通过对比结构自振特性与竣工时的变化，分析了结构各部分的损伤程度。

It is important in earthquake engineering to investigate the vibration characteristics of building-soil system and evaluate the damage extent from their change. In this study, a vibration characteristics of the actual Building-Soil system were investigated for the impulsive load using Land Air Gun Impactor which is used in the geological reflection survey, and compared with those for the sinusoidal waves.In the 1999 fiscal year, the fundamental characteristics of the generated wave from the impactor were investigated. The attenuation characteristics were investigated and reciprocity was confirmed. Stacking technique was used for enhance the S/N ratios in the data processing. Impactor test was performed in the actual SRC building of Tohoku University. The vibration characteristics were investigated and compared with those for the 1998/9/15 near-source earthquake in Sendai.In the 2000 fiscal year, the forced vibration test using the unbalanced-mass type excitor was performed in the same building of the Tohoku University. The vibration characteristics for the sinusoidal waves were compared with those for the impactor test. It is found that the resonant and phase lag curves are consistent with the results of the impactor test. Simulation analyses were performed for these test results using frame models of the building. Comparing the change of the dynamic characteristics from those at the completion time, the damage extent of the each part of the building was investigated.