Torsional phenomena in 2008 great Wenchuan earthquake  

作　　者：Fan Yang Qifeng Luo Wei Che 

机构地区：[1]Research Institute of Structural Engineering and Disaster Reduction, Tongji University, Shanghai 200092, China [2]Shanghai Institute of Disaster Prevention andRelief Tongji University, Shanghai 200092, China [3]School of Engineering and Technology, China University ofGeoscienees, Beijing 100083, China

出　　处：《Earthquake Science》2010年第1期79-85,共7页地震学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (No. 50578125)

摘　　要：It is well known that there are some torsional damages in earthquakes. In Taibai park, Jiangyou city, Sichuan province, most of the stone statues, which were placed upon the banisters of one zigzag bridge, exhibited different torsional phenomena in 2008 Wenchuan earthquake. This paper introduces the torsional phenomena of all the statues on the zigzag bridge firstly. Then one eccentric- ity model is established and the equivalent rotational accelerations are calculated in order to analyze the causes of the torsional damage. In addition, the torsional components are synthesized by using translation accelerations recorded at Jiangyou station in the Wenchuan earthquake. The results show that the equivalent rotational acceleration is larger than the synthesized rotational components, which sug- gests that the torsional phenomena of the statues on the zigzag bridge might mainly come from its eccentricity. The comparison between the estimated torsional component at Jiangyou and that presented by Trifunac shows that they are in the same order. The research im- plies that the torsional phenomena in earthquakes are very complicated, and not only caused by torsional motions.It is well known that there are some torsional damages in earthquakes. In Taibai park, Jiangyou city, Sichuan province, most of the stone statues, which were placed upon the banisters of one zigzag bridge, exhibited different torsional phenomena in 2008 Wenchuan earthquake. This paper introduces the torsional phenomena of all the statues on the zigzag bridge firstly. Then one eccentric- ity model is established and the equivalent rotational accelerations are calculated in order to analyze the causes of the torsional damage. In addition, the torsional components are synthesized by using translation accelerations recorded at Jiangyou station in the Wenchuan earthquake. The results show that the equivalent rotational acceleration is larger than the synthesized rotational components, which sug- gests that the torsional phenomena of the statues on the zigzag bridge might mainly come from its eccentricity. The comparison between the estimated torsional component at Jiangyou and that presented by Trifunac shows that they are in the same order. The research im- plies that the torsional phenomena in earthquakes are very complicated, and not only caused by torsional motions.

关 键 词：Wenchuan earthquake Jiangyou torsional phenomenon ECCENTRICITY torsional motion 

分 类 号：TG143.2[一般工业技术—材料科学与工程] P315.9[金属学及工艺—金属材料]