Experimental, numerical and field study investigating a heritage structure collapse after the 2015 Gorkha earthquake
Experimental, numerical and field study investigating a heritage structure collapse after the 2015 Gorkha earthquake
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DOI：
10.1007/s11069-020-03871-7
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发表时间：
2020-02
期刊：
影响因子：
3.7
通讯作者：
Ashutosh Kumar;P. Hughes;V. Sarhosis;D. Toll;S. Wilkinson;R. Coningham;K. P. Acharya;K. Weise;A. Joshi;Christopher Davis;R. B. Kunwar;P. Maskey
中科院分区：
文献类型：
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作者：
Ashutosh Kumar;P. Hughes;V. Sarhosis;D. Toll;S. Wilkinson;R. Coningham;K. P. Acharya;K. Weise;A. Joshi;Christopher Davis;R. B. Kunwar;P. Maskey
本文介绍了2015年尼泊尔加德满都廓尔喀地震期间一座有325年历史的多层遗产寺庙倒塌的调查。该研究包括一个普查，然后进行岩土工程调查和数值反分析，以了解潜在的原因崩溃。对寺庙结构配置的评估表明，由于寺庙高度上存在不连续的柱子以及砌体墙中老化的粘结，设计中存在地震脆弱性。岩土工程调查显示，该地点存在合格的土层，这有助于调查，调查表明地基没有差异或过度沉降。对岩土工程勘察期间回收的样品进行了一系列循环三轴试验，以确定土壤的动态特性。此外，根据记录的加速度-时间历史对寺庙基座进行的动态分析表明，最大漂移百分比为1.4%，剩余相对位移为32 mm，这表明倒塌背后的潜在原因。这项研究的成果将支持尼泊尔世界遗产地内古建筑的抗震修复，并制定有效的行动计划，以保护它们免受未来地震灾害的影响。
This paper presents an investigation of the collapse of a 325-year-old multi-tiered heritage temple during the 2015 Gorkha earthquake in Kathmandu, Nepal. The research comprises a reconnaissance survey followed by a geotechnical investigation and numerical back-analysis carried out to understand the potential causes of the collapse. The assessment of the structural configuration of the temple indicated seismic vulnerability in the design due to the presence of discontinuous columns over the height of the temple and age-weakened bonding in the masonry walls. The geotechnical investigation revealed the presence of competent soil strata at the location, assisting the survey which indicated no differential or excessive settlement in the foundation. A series of cyclic triaxial tests were conducted on samples recovered during the geotechnical investigation to determine dynamic behaviour of the soil. Further, dynamic analysis of the plinth of the temple under the recorded acceleration–time history indicated a maximum drift percentage of 1.4% and residual relative displacement of 32 mm suggesting the potential reason behind the collapse. The output of this research will support seismic rehabilitation of ancient structures within World Heritage sites across Nepal and effective action plans to safeguard them against future earthquake hazard.