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ISSN 2096-7780 CN 10-1665/P

西藏定日县MS6.8级地震对等效框架模型砌体结构的破坏性分析

Destructive analysis of the MS6.8 earthquake in Dingri County,Tibet on the masonry structure of the equivalent frame model

  • 摘要: 2025年1月7日,中国西藏自治区日喀则市定日县发生Ms6.8级地震,造成27248户房屋受损、3612户房屋倒塌。选取台站XZ.D0007南北方向地震记录(XZ.D0007-NS),进行了时-频反应谱分析。针对灾区典型砌体结构房屋,建立二层等效框架结模型,计算出其结构损伤曲线并结合XZ.D0007-NS时-频反应谱等高线图分析了此次地震对砌体结构的破坏性。研究表明:XZ.D0007-NS记录时-频反应谱大体拥有一个独立的峰,其时-频反应谱峰值区域覆盖面积不大,其对于钢筋混凝土结构破坏力不大。XZ.D0007-NS地震波记录高频成分卓越,对于砌体结构房屋,只要其结构损伤曲线进入时-频反应谱峰值区域,将迅速发生严重破坏。对于藏区无抗震构造措施的传统民居,更将造成毁灭性破坏。西藏地区地震活动频繁,深入研究此次地震的发震机理、灾害特征和应急处置等问题,对于提升该地区地震监测预报、灾害防御和应急救援能力具有重要意义。

     

    Abstract: On January 7, 2025, an earthquake with a magnitude of Ms6.8 struck Dingri County, Shigatse City, Tibet Autonomous Region, China, damaging 27, 248 houses and collapsing 3, 612 houses. The seismic records of station XZ.D0007 in the north-south direction (XZ.D0007-NS) were selected and the time-frequency response spectrum analysis was carried out. For the typical masonry structure houses in the disaster area, the two-story equivalent frame model was established, the structural damage curve was calculated, and the damage of the earthquake to the masonry structure was analyzed by combining the contour diagram of the time-frequency response spectrum of XZ.D0007-NS. The results show that the time-frequency response spectrum recorded of XZ.D0007-NS generally has an independent peak, and the peak area of the time-frequency response spectrum is not large, and its destructive force on reinforced concrete structures will not be large. The XZ.D0007-NS seismic wave records excellent high-frequency composition, and for masonry houses, as long as they enter the peak area of the time-frequency response spectrum, serious damage will occur quickly. For traditional houses in Tibetan areas that do not have earthquake-resistant structural measures, it will cause devastating damage. Earthquake activity in Tibet is frequent, and in-depth research on the seismic mechanism, disaster characteristics and emergency response of this earthquake is of great significance for improving the earthquake monitoring and forecasting, disaster prevention and emergency rescue capabilities in the region.

     

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