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Dynamic Vibration Model for Ordinary Building Considering Ground Characteristics

考虑地面特性的普通建筑动力振动模型

基本信息

批准号：
09450201
负责人：
KANDA Jun
金额：
$ 4.48万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09450201/
关键词：
Micro tremor Soil-Structure Interaction high rise buildings low rise buildings a fixed base model an SR model natural period damping ratio 建物-地盤連成系等価一質点系伝達関数同定常時微動測定カーブフィット法 RD法自己相関法

项目摘要

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

为了构建考虑地面土壤的动力振动模型，对既有建筑物进行了微震测量，并借助传递函数系统辨识技术研究了建筑物的动力特性。对于高层建筑，对24座既有钢结构建筑进行了测量。结果，发现固定的基础模型足以作为适当的动态模型，因为无法观察到土壤-结构相互作用效应。在动态特性中，自然周期和阻尼比被选为重要参数，并采用多种系统辨识技术进行研究：曲线拟合法、RD（随机递减）法和ARX（外源输入自回归模型）法。通过RD方法，得到以下关系：TィイD21ィエD2=0.021H和hィイD21ィエD2=0.956/T1+0.566，其中TィイD21ィエD2是建筑物的第一自然周期，H是建筑高度（米）， hィイD21ィエD2是第一模态阻尼比。连续地，较高的模态阻尼比估计为hィイD22ィエD2=0.873hィイD21ィエD2+0.301和hィイD23ィエD2=0.440hィイD21ィエD2+O.993。对于中层和低层建筑，对七座钢筋混凝土建筑物进行了微震测量。结果表明，SR（Sway-Rocking）模型适合作为动态模型，因为土壤-结构相互作用效应被发现是显着的。根据假设的固定基础模型的实测传递函数来估计建筑物的第一自然周期，然后根据假设的SR模型的实测传递函数的摇摆刚度取最大值来估计第一模态阻尼比、地面的摇摆刚度及其阻尼比。充分利用曲线拟合方法，提出了一种新的两步系统辨识技术，以估计建筑物的一些重要振动参数。建筑物以及土-结构相互作用的影响。发现存在TィイD2bィエD2＜TィイD2RィエD2＜TィイD2TィエD2模型和TィイD2TィエD2：SR模型的趋势。由于摇摆模态在低层建筑中比摇摆模态更为突出，因此从Tb到TィイD2RィエD2的拉长程度比从TィイD2RィエD2到TィイD2TィエD2的拉长程度要显着得多。SR模型的阻尼比远大于建筑物本身的阻尼比，并且第一自然周期与建筑物本身的阻尼比之间存在关系。阻尼比变为 hィイD2TィエD2TィイD2TィエD2=0.02。这意味着建筑物的自然周期较短时可获得较大的阻尼比。较少的