青海玛多7.4级地震极震区震灾调查及分析

Investigation and Analysis of Earthquake Disaster in the Extreme Earthquake Area of M_(S)7.4 Earthquake in Qinghai Province

2021年5月22日2时4分,青海省玛多县发生7.4级地震,距震中26 km的野马滩大桥及周边区域为此次地震极震区(地震烈度Ⅹ度,面积约69 km^(2)),受损尤为严重。桥梁表现为落梁式破坏,房屋不同程度受损。对极震区内野马滩大桥及周边房屋进行实地调查与震灾分析,并提出灾后重建及震灾防御相关建议,包括组织专业人员进行灾区房屋安全鉴定,建议牧民居住建筑采用轻钢式结构,建议原地重建野马滩大桥并增加限位装置及连梁装置。

At 02:04 on May 22,2021,a magnitude 7.4 earthquake occurred in Maduo County,Qinghai Province.The Yematan Brid-geand its surroundings,26 km away from the epicenter,are the extreme disaster area(the area of earthquake intensity 10 is about 69 km^(2)).The damage type of this bridge was the falling-beam damage,and the local residential buildings were damaged to different levels.The field investigations and earthquake disaster analysis were carried out on the Yematan Bridge and surrounding houses in the ex-treme disaster zone,and relevant suggestion on post-earthquake reconstruction and earthquake disaster prevention were put forward:Conduct detailed house safety appraisal for the professional personnel of housing construction organization in disaster area;For grazing residential areas,it is suggested to use light steel structure houses;For the Yematan Bridge,it is recommended to rebuild in situ,and in-crease additional limiting and connecting beam device.