九寨沟7.0级地震房屋震害现场调查及其破坏特征

Field Investigation and Failure Characteristics of Buildings Damaged by the 7.0-Magnitude Earthquake in Jiuzhaigou

摘要:

2017年8月8日四川省阿坝州九寨沟县发生7.0级地震，震源深度20 km，造成大量房屋不同程度的破坏，引发地质灾害。针对Ⅷ、Ⅸ区的337栋不同结构类型的房屋进行了震害特征分析，给出震害矩阵，揭示各类结构房屋的破坏机理。经过统计，所调查的房屋中3.3%的建筑保持完好，19.9%的建筑发生轻微破坏，51.3%的建筑发生中等破坏，21.1%的建筑发生严重破坏，4.5%的建筑发生毁坏。经过调查，钢筋混凝土框架结构、大跨度空间结构、钢框架结构以及采用木板作为填充墙的穿斗式木构架房屋在本次地震中表现良好。分析表明，经过合理的抗震设计，基本达到了中震可修的抗震设防目标，极大程度地保护了人们的生命及财产安全。

Abstract:

The 7.0-magnitude earthquake that occurred in Jiuzhaigou on August 8, 2017, which featured a focal depth of 20 km, caused damage to a large number of houses. Analysis of seismic damage characteristics of 337 buildings with different types of structures in areas VⅢ and IX revealed the failure mechanism of each type of building. Statistics indicated 3.3% well-kept buildings, 19.9% slightly damaged buildings, 51.3% moderately damaged buildings, 21.1% severely damaged buildings, and 4.5% destroyed building. Field investigation suggested that reinforced concrete frame structures, large-span spatial structures, steel-frame structures, and Chuandou-type timber structures with infilled walls of wood present good seismic performance. The analysis results indicated that the structures surveyed basically fulfill the seismic fortification criterion of "repairable under moderate earthquake," and, thus, the lives and personal property of residents may be considered to be greatly protected.