Dynamic Vibration Model for Ordinary Building Considering Ground Characteristics

为了建立一个动态振动模型，对地面土壤进行核算，对现有建筑物进行了微观测量，并对建筑物的动态特性进行了研究，并对带有转移功能的系统识别技术的辅助进行了研究。对于高风险建筑物，对24个现有钢铁建筑物进行了测量。根据结果，一个固定的基础模型已经被发现足够充分，因为一个合适的动态模型因为土壤结构的交互效应不能被观察到。在动态特征中，自然周期被选定为重要参数和用几种系统识别技术研究的阻尼率：曲线拟合方法、RD （随机衰减）方法和ARX （具有可再生输入的自动回归模型）方法。使用RD方法，后续关系：T-D21-D2=0.021H和H-D21-D2=0.956/T1+0.566被发现，而T-D21-D2是建筑物的第一个自然时期，H是一个b ... More uilding height in meter，hy D21 y D2是第一个模型阻尼率。合理的、高模型阻尼率估计为h-D22-D2= 0.873 h-D21-D2+0.301和h-D23-D2= 0.440 h-D21-D2+ O.993，对于中等和低风险建筑，对七个强化混凝土建筑物的微观测量已被制造。根据结果，它表明SR （Sway-Rocking）模型适合于动态模型，因为土壤结构的相互作用效应被发现是有意义的。第一个自然周期的建筑是估计的，从一个假定固定基础模型的测量转移函数，然后是第一个模型阻尼率。地面的岩石硬度及其阻尼率估计是根据假定SR模型的岩石硬度具有可衡量的转移函数的最大值。一种新的两步系统识别技术已经提出了完全利用曲线的方法。一种适合建筑物的方法，以估计一些重要的振动参数，如良好的土壤结构相互作用效应。It is found that there is a tendency that TイイD2bイイD2 <TイD2 RイD2 < TイD2 TイD2 model and TイD2 ： that of an SR model。自sway mode在低rise buildings than the rocking mode is， the Degree of lengthening from Tb to TイD2RイD2 is much more significant than that from TイD2RイD2 to TイD2.The damping ratio of the SR model is much larger than that of the building itself，and the relationship between the first natural period and the damping ratio becomes h，D2T，D2T，D2= 0. 02。这就意味着，在建筑物的自然周期中，一个更大的转储率是短暂的。Less（低）

To construct a dynamic vibration model taking account of ground soil, micro-tremor measurement of existing buildings has been made, and dynamic characteristics of the buildings was studied with the aid of a system identification technique with transfer functions.For high rise buildings, measurement of twenty four existing steel buildings have been carried out. As the result, a fixed base-model is found to be sufficient enough as an appropriate dynamic model since the soil-structure interaction effect cannot be observed. Among the dynamic characteristics, the natural period arid a damping ratio were selected as important parameters and studied with several system identification techniques : a curve fitting method, a RD (Random Decrement) method and an ARX (Auto-Regressive model with eXogeneous input) method. With the RD method, the following relationships : TィイD21ィエD2=0.021H and hィイD21ィエD2=0.956/T1+0.566 are obtained, where TィイD21ィエD2 is a first natural period of a building and H is a b … More uilding height in meter, hィイD21ィエD2 is a first modal damping ratio. Consecutively, higher modal damping ratios were estimated as hィイD22ィエD2=0.873hィイD21ィエD2+0.301 and hィイD23ィエD2=0.440hィイD21ィエD2+O.993.For the middle and low rise buildings, micro-tremor measurement of seven reinforced concrete buildings have been made. As the results, it is pointed out that an SR (Sway-Rocking) model is appropriate as an dynamic model since the soil-structure interaction effect is found to be significant. The first natural period of a building were estimated from measured transfer functions of an assumed fixed base model, then the first modal damping ratio, rocking stiffness of the ground and its damping ratio were estimated on the basis that the rocking stiffness takes the maximum value for the measured transfer function of an assumed SR model.A new two-step system identification technique has been proposed fully utilizing a curve-fitting method in order to estimate some important vibration parameters of buildings as well as the soil-structure interaction effect. It is found that there is a tendency that TィイD2bィエD2 < TィイD2RィエD2 < TィイD2TィエD2 model and TィイD2TィエD2 : that of an SR model. Since the sway mode is more prominent in the low rise buildings than the rocking mode is, the degree of lengthening from Tb to TィイD2RィエD2 is much more significant than that from TィイD2RィエD2 to TィイD2TィエD2.The damping ratio of the SR model is much larger than that of the building itself, and the relationship between the first natural period and the damping ratio becomes hィイD2TィエD2TィイD2TィエD2=0.02. It implies that a larger damping ratio is obtained in case the natural period of a building is short. Less