2018年云南墨江5.9级地震房屋震害特征与烈度评定*
卢永坤,周 洋,代博洋,杨健强,闫 瀚

(云南省地震局,云南 昆明 650224)

墨江5.9级地震; 地震烈度; 破坏比; 震害指数

Building Seismic Damage Characteristics and Intensity Evaluation of Yunnan Mojiang M5.9 Earthquake in 2018
LU Yongkun,ZHOU Yang,DAI Boyang,YANG Jianqiang,YAN Han

(Yunnan Earthquake Agency,Kunming 650224,Yunnan,China)

Mojiang M5.9 earthquake; seismic intensity; damage ratio; seismic damage index

备注

介绍了2018年9月8日云南墨江5.9级地震烈度分布情况,给出了各烈度区的房屋建筑震害特征和各类结构房屋的破坏比、震害指数,并与中国地震烈度表进行了对比,探讨地震烈度评定的主要依据与方法。结果 表明:墨江地震灾区各类结构房屋的抗震性能依次为框架结构最好,砖混结构次之,传统砖木结构和土木结构较差,空心砖墙抬梁结构最差; 各烈度区、调查点震害指数与烈度对应关系良好; 本次地震烈度评定结果符合国家标准和云南地区地震烈度分布规律。建议现场调查评定地震烈度应以灾区占比较高的房屋结构的震害作为主要依据,并通过计算房屋平均震害指数定量评定地震烈度。

The distribution of the seismic intensity of the Mojiang MS5.9 earthquake occurred on Sep.8,2018 in Yunnan Province is introduced,and the damage characteristics of buildings,the damage ratio and seismic damage index of various structure building in each intensity area are compared with those of the Chinese Seismic Intensity Scale. Then the main basis and method of seismic intensity assessment are discussed. It is concluded that the aseismic performance of all kinds of buildings in Mojiang earthquake disaster area is as follow: The frame structure is the best, brick-concrete structure is the second, traditional brick and civil structure is poor, and the hollow brick wall is the worst. The seismic damage indexes of each intensity area and investigation point correspond well with the intensity. The intensity distribution of the Yunnan Mojiang MS5.9 earthquake meets the national standard and the distribution law of seismic intensity in Yunnan. We suggest that the seismic intensity by field investigation should be based on the earthquake damage of the housing structure, which takes up a high ratio in the seismic intensity assessment. The earthquake intensity should be quantitatively evaluated by calculating the average seismic damage index of buildings.