西藏定日2025年1月M_(S)6.8级强震对藏式民居的破坏模拟与动力响应反演  

Seismic damage simulation and dynamic response inversion of Tibetan dwellings in Dingri County,Xizang,during the M_(S)6.8 earthquake in January 2025

作　　者：常鸣[1] 范宣梅[1] 周康驰 赵伟华[1] 刘洋[1] CHANG Ming;FAN Xuanmei;ZHOU Kangchi;ZHAO Weihua;LIU Yang(State Key Laboratory of'Geohazard Prevention and Geological Environment Protection,Chengdu Universityof Technology,Chengdu 610059,China)

机构地区：[1]地质灾害防治与地质环境保护全国重点实验室(成都理工大学),成都610059

出　　处：《成都理工大学学报(自然科学版)》2025年第2期185-198,共14页Journal of Chengdu University of Technology: Science & Technology Edition

基　　金：国家自然科学基金(42477173);四川省中央引导地方科技发展专项项目(2024ZYD0121);成都理工大学珠峰科学研究计划2.0交叉项目支持。

摘　　要：为研究西藏自治区日喀则市定日县藏式民居在M_(S)6.8级地震中的破坏模式与动力响应,以土木石结构的藏式民居为原型,使用1/12缩小模型开展了地震模拟振动台试验。对西藏定日藏式民居在M_(S)6.8级地震中破坏情况和动力响应反演的重要研究结果如下:(1)藏式民居模型的薄弱点集中在屋檐处的墙体、二层、门窗开口附近的墙体以及墙角,其中屋檐和门窗开口是最易受损的部位。(2)模型结构存在扭转效应,即模型第一层刚度远超过第二层,导致第二层产生了显著的层间位移并伴随扭转效应,使得该层成为结构的薄弱层。(3)通过加载逐级增大的加速度,模型能有效抵御高达0.4g的地震强度,但在更高强度的地震(0.62g及以上)作用下,模型会出现倒塌破坏。由于缩尺效应,实际房屋的破坏程度将更为严重。本研究对认识此次定日M_(S)6.8级地震房屋破坏模式提供科学依据,同时也为该地区藏式房屋抗震性能的提高以及灾后重建提供重要参考。To study the damage patterns and dynamic response of Tibetan dwellings in Dingri County,Xizang,during the recent M_(S)6.8 earthquake,a 1/12 scale model based on the timber-stone structure of Tibetan dwellings was constructed,and earthquake simulation vibration table tests were conducted.Inversion analysis was performed on the damage and dynamic response of Tibetan dwellings in Dingri County during the earthquake.The key findings of the study are as follows.(1)The weak points of the Tibetan dwelling model are concentrated in the walls at the eaves,the second floor,walls near doors and window openings,and corners.Among these,the eaves and door/window openings are the most vulnerable areas.(2)The model structure exhibits torsional effects,with the stiffness of the first floor significantly greater than that of the second floor,leading to significant interlayer displacement and torsion in the second floor,making it the weakest layer of the structure.(3)By progressively increasing the acceleration,the model can effectively withstand earthquake intensities up to 0.4 g.However,under higher-intensity earthquakes(0.62 g and above),the model experiences collapse and damage.Due to the scaling effect,damage to actual buildings will be more severe.This study provides scientific evidence for understanding the damage patterns of houses during this earthquake,and also offers important references for improving the seismic performance of Tibetan dwellings and for post-earthquake reconstruction in the region.

关 键 词：藏式民居 地震模拟振动台试验 破坏模式 动力响应 定日M_(S)6.8级地震 

分 类 号：TU361[建筑科学—结构工程] TU362TU363