摘要
2015年4月至5月,包括一次8.1级地震和三次7.0级以上余震的地震序列对尼泊尔中部偏北地区造成严重影响。片石结构和钢筋混凝土框架结构是这一地区最为常见的两种自建民居的结构形式。本文在总结本次地震序列中这两种自建民居的震害特征的基础上,给出在九个宏观烈度评定为8度的调查点获取的这两种结构形式房屋的破坏比。自建钢筋混凝土框架结构房屋虽然大多不满足尼泊尔抗震规范的相关要求,抗震设防水平较低,但其破坏程度远远小于片石结构。即使在交通不便、经济落后的尼泊尔山区,钢筋混凝土框架结构也已在很大程度上得到推广。这一经验值得我国村镇建筑借鉴。结合震害调查工作,反思了建筑抗震性能差异和强余震等因素对我国现行的基于震害现象的烈度评定方法的干扰。
The earthquake sequence in April and May,2015,including an Ms8. 1 main shock and three aftershocks of magnitudes greater than 7. 0,affected a wide area in central Nepal. Stone masonry and reinforced concrete（ RC） frames are the two major structural systems for rural residences in the affected region. After summarizing the characteristics of the seismic damages to these systems in the earthquake sequence,damage ratios of the two structural systems are provided based on the field survey in various locations. The owner-built RC frames exhibited much smaller damage ratio than the stone masonry houses,although they do not conform to the Nepalese seismic provisions and their seismic performance may have been considered poor. Such RC frames have been widely built even in mountainous and poor regions. In addition,the current practice of quantifying seismic intensity by observed building damages may cause confusion especially if the seismic performance of the buildings widely varies or if the main shock is followed by strong aftershocks.
出处
《地震工程与工程振动》
CSCD
北大核心
2015年第4期51-59,共9页
Earthquake Engineering and Engineering Dynamics
基金
中国地震局工程力学研究所基本科研业务费面上项目(2013B13)
国家自然科学基金项目(51308514,51478441)
关键词
尼泊尔地震序列
片石砌体
钢筋混凝土框架结构
掉层建筑
烈度评定
强余震
Nepal earthquake sequence
stone masonry
reinforced concrete frame
damage ratio
seismic intensity
strong aftershock
