Mapping the seismic safety of RC "template schools" in Nepal
Mapping the seismic safety of RC "template schools" in Nepal
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DOI：
10.1016/j.ijdrr.2020.101844
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发表时间：
2020-09
影响因子：
5
通讯作者：
Ted Cross;F. Luca;R. Risi;Tek Raj Ranamagar;T. Mitchell;A. Sweetman
中科院分区：
文献类型：
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作者：
Ted Cross;F. Luca;R. Risi;Tek Raj Ranamagar;T. Mitchell;A. Sweetman
对尼泊尔一所模板学校进行了地震风险评估，以评估单一设计结构在具有可变地震危险的地区的适用性。许多非政府组织（NGO）使用建筑模板设计作为降低设计成本的方法;这导致在大面积上使用单一的抗震设计。这种方法在尼泊尔特别受欢迎，因为政府要求所有学校设计都要获得教育部的批准。概率地震危险性分析（PSHA）研究表明，尼泊尔各地的地震危险性各不相同，PGA的475年重现期为0.05 g至0.73 g。在尼泊尔建造学校的慈善机构Pahar trust提供了一种带有砖石填充物的钢筋混凝土结构的设计。建立了砌体填充前后的有限元模型和脆性曲线，探讨了砌体填充对结构地震危险性的影响。然后将危险性和脆弱性相结合，以找到尼泊尔全国模板学校的地震风险。然后评估了475年和2475年地震下的模板学校的破坏分布。学校超过损害限制（DL）和生命安全（LS）的概率有显着的地理变化，475年一遇的地震导致学校超过DL在大多数地方，2475年一遇的地震导致学校超过LS在大多数地方。填充物的结构性贡献使风险水平低于欧洲通常用作参考的阈值。
Seismic risk assessment of a template school across Nepal is carried out to evaluate the suitability of a single design structure across an area with variable seismic hazard. Many non-governmental organisations (NGOs) use template designs for buildings as a method of reducing design costs; this results in a single seismic design used over a large area. Such an approach is particularly popular in Nepal as the government requires that all school designs obtain approval from the Department of Education. Probabilistic seismic hazard analysis (PSHA) studies have shown a varying seismic hazard across Nepal with the PGA a 475-year return event ranging from 0.05 g to 0.73 g. Pahar trust, a charity that builds schools in Nepal, provided the design of a reinforced concrete (RC) structure with masonry infills. Finite element (FE) models and fragility curves are developed with and without the masonry infill as to explore the effect of masonry infills on the seismic risk. The hazard and the fragility are then integrated to find the seismic risk of the template school across Nepal. The damage distribution is then evaluated for the template school under a 475-year and 2475-year earthquake. The probability of the school exceeding damage limitation (DL) and life safety (LS) has significant geographic variation, with a 475-year earthquake causing the school to exceed DL in most locations and a 2475-year return earthquake causing the school to exceed LS in the majority of locations. The structural contribution of infills brings the risk level below the threshold typically employed as reference in Europe.