基于常时微动观测的钢筋混凝土建筑物振动特性及其地域差异

Regional differences and dynamic characteristics of RC buildings based on microtremor measurement

以呼和浩特市区钢筋混凝土建筑物为研究对象,实施常时微动观测,分析了建筑物的振动特性,以及通过把呼和浩特市与其他地区的观测数据进行比较研究,初步探索了钢筋混凝土建筑物振动特性的地域差异,并得出如下结论:1建筑物的第一次共振周期与楼层数或高度存在正相关关系,而楼层相同时则与建筑年代呈反相关关系,且大多数建筑物具有短轴方向的共振周期与长轴方向相同或较之偏大等特征。2大多数建筑物与地基间有着一定的相互作用。3同样建筑比较而言,福冈市的建筑物共振周期最小,乌兰巴托市最大,呼和浩特市和台中市的建筑物共振周期因长、短轴方向差异而大小不同。

The vibration characteristics of reinforced concrete buildings in Hohhot city were analyzed with the microtremor measurement,then they were compared with the observation data of other regions and the regional differences were preliminarily studied. It was shown that the first resonance period of buildings is positively correlated with the floor number or height,but negatively related with the age of buildings when floor No. is the same; the resonance period in short axis direction of most buildings is equal to or is larger than that in long axis direction; most buildings have some interactions with their foundations; Fukuoka city building’s resonance periods are the minimum,those of Ulaanbaatar buildings are the maximum,those of Hohhot city and Taizhong city buildings are different due to differences between the long axis direction and the short axis one.