Seismic damage investigation and analysis of frame structures in Luding Ms6.8 earthquake considering platform effect

被引：0

作者：

Pan Y. ^{[1
,2
]}

Ren J. ^{[3
]}

Ren Y. ^{[1
]}

Zhao J. ^{[4
]}

Ba Z. ^{[4
]}

机构：

[1] School of Civil Engineering, Southwest Jiaotong University, Chengdu

[2] Key Laboratory of Seismic Engineering of Sichuan Province, Southwest Jiaotong University, Chengdu

[3] CITIC General Institute of Architectural Design and Research Co., Ltd., Wuhan

[4] Tianjin University, Tianjin

来源：

Tumu Gongcheng Xuebao/China Civil Engineering Journal | 2024年 / 57卷 / 06期

关键词：

frame structure; Luding earthquake; platform effects; seismic damage investigation; seismic damage simulation; vertical earthquake;

D O I：

10.15951/j.tmgcxb.23050358

中图分类号：

学科分类号：

摘要：

On September 5,2022, an Ms 6. 8 earthquake occurred in Luding County, Sichuan Province. In the seismic damage investigation of a frame structure on the Moxi platform, it was found that the east and west frames experienced varying degrees of seismic damage. All the upper of the frame columns appeared “strong beam-weak column” type failure. The proportion of the failure levels of medium or above in the west frames accounts for 81%, while the proportion of the east frames is only 13%, showing a strong correlation with the platform edge. To analyze the reasons of seismic damage differences between east and west frames, the FK-SEM method was used to analyze the seismic amplification effect of the Moxi platform. The calculation results indicate that the closer to the edge of the platform, the greater the seismic amplification factor is. The horizontal and vertical seismic amplification factors are 2. 30 and 2. 25 for the west frames, while 2. 01 and 1. 99 for the east frames. Based on the platform effect and the ground motion records of Moxi station, seismic damage simulations were conducted on the east and west frames, and the reasons for structural failure were analyzed. The results indicate that the actual amplification factor of the seismic impact coefficient on the edge of the Moxi platform exceeds that in the Code for Seismic Design of Buildings, exhibiting a superposition of unfavorable areas effect and near-field seismic effect. It is difficult to achieve the seismic fortification goal of “not collapsing during a major earthquake” when designing multi-story frame structures in unfavorable areas. Vertical earthquake is the direct cause of the damage of the bottom of the frame columns with the main forms of tensile and compressive failure, while horizontal earthquake mainly causes secondary damage. The imitated Queti structures are unfavorable for structural deformation and is the main reason for the “strong beam weak column” type failure of frame structures. Based on the investigation and analysis results of seismic damage, it is recommended to analyze the building site and consider the impact of vertical earthquakes before designing the multi-story frame structures near the edge of the platform in 9 degree fortification areas. In architectural design with national characteristics, decorative elements such as imitated Queti structures should be separated from the frames and designed as non-structural components to reduce their their impact on the seismic resistance of the frame structures. © 2024 Chinese Society of Civil Engineering. All rights reserved.

引用

页码：136 / 151

页数：15

共 21 条

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