四川长宁Ms6.0级地震建筑震害调查与分析

Investigation and analysis of building damage caused by Ms6.0 Changning earthquake in Shichuan ProVince

2019年6月17日的长宁6.0级地震给宜宾地区建筑工程造成了严重破坏。本文主要调查了长宁地震烈度Ⅶ度和Ⅷ度地区,以及部分Ⅵ度地区的42个调查点的建筑震害。震害调查表明:对于中强地震事件,按照规范进行设计建造的房屋建筑,甚至包括部分自建房屋大多主体结构基本完好或轻微破坏,但填充墙、吊顶等建筑非结构构件震害相对严重,导致房屋功能失效;构造措施对砖混结构民居的抗震性能提升显著,只要有圈梁构造柱,就能大幅降低砖混农居的震害水平;在Ⅷ度及以下灾区范围内,框架结构房屋的建筑非结构系统破坏程度明显重于砖混结构;早期建设的框架结构中小学校舍建筑抗震能力明显偏低;为获得原始震害现场资料,建议工程结构震害机理科学考察工作提前,与震后应急、烈度评估工作同步开展。

The Ms 6.0 Changning earthquake caused serious damage to structures in Yibin area.Structural damages at 42 survey points,which coversall the earthquake intensity VII and VIII areas andsome typical earthquake intensity VI areas,are conducted.Investigation results show that when facing moderate intensity earthquakes,the structural components of most buildings remain generally intact,while the nonstructural components,including infilled walls and ceilings,suffer relatively severe damage.The damage of the nonstructural components has led to the structural function interruption.Seismic conceptional design measures,including ring beams and constructional columns,could significantly enhance the seismic performance of masonry structures.For areas with earthquake intensity at VII and below,the damage degree of nonstructural component in frame structures is much worse than that of masonry structures.Those frame type teaching buildings,built 20 years ago,at elementary and middle schools perform terrible during this earthquake.Meanwhile,it’s suggested that the scientific investigation on structural damage mechanism could be arranged earlier,along simultaneously with the post-earthquake emergency response and intensity assessment.