瓯江北口大桥位于浙江省温州市瓯江口附近,大桥主跨间距大,自振周期长,远场大震可能造成的地震风险不容忽视,需要开展专门的地震安全性评价工作。通过对桥址区场地所处区域地震构造背景的研究、实际的场地工程地震条件勘测,开展地震危险性分析及场地土层地震反应分析,确定了大桥场地地震动参数,为工程抗震设计与分析提供了科学的数据。 The Oujiang Beikou Bridge is located near the Oujiang River in Wenzhou City, Zhejiang Province. The main span of the bridge is large and the period of natural vibration is long. The possible earthquake risk caused by far-field large earthquakes can not be neglected. Special seismic safety assessment needs to be carried out. Through the research on the seismic tectonic setting in the area where the bridge site is located, the actual site engineering seismic condition survey, the analysis of seismic hazard and the analysis of the earth’s soil seismic response, the ground motion parameters of the bridge site are determined. Provide scientific data.