Structural Mechanics of Engineering Constructions and BuildingsStructural Mechanics of Engineering Constructions and BuildingsСтроительная механика инженерных конструкций и сооружений1815-52352587-8700Peoples’ Friendship University of Russia named after Patrice Lumumba (RUDN University)3921810.22363/1815-5235-2024-20-2-120-133JNAYFFSeismic resistenceСейсмостойкость сооруженийResearch ArticleSeismic Fragility Analysis of Existing Old Newari Brick Masonry Building in Pokhara ValleyАнализ сейсмической устойчивости старого кирпичного здания в стиле Ньюари в долине Покхараhttps://orcid.org/0009-0006-7964-8601ChapagainKrishnaЧапагайнКришна

Post Graduate Student, M.Sc. in Structural Engineering, School of Engineering

аспирант, магистр строительных технологий, инженерный факультет

krishnachapagain1234567@gmail.comhttps://orcid.org/0000-0002-9483-5652ChaulagainHemchandraЧаулагейнХемчандра

Ph.D., Associate Professor, School of Engineering

Ph.D., доцент, инженерный факультет

hchaulagain@gmail.comPokhara UniversityУниверситет Покхара15052024202VOL 20, NO2 (2024)ТОМ 20, №2 (2024)12013321052024Copyright ©; 2024, Chapagain K., Chaulagain H.Copyright ©; 2024, Чапагайн К., Чаулагейн Х.2024Chapagain K., Chaulagain H.Чапагайн К., Чаулагейн Х.https://creativecommons.org/licenses/by-nc/4.0https://journals.rudn.ru/structural-mechanics/article/view/39218

Most of the building stock in Nepal is based on masonry construction, which includes monumental, administrative, and residential structures. These structures are vulnerable during earthquakes, as evidenced by the massive structural damage, loss of human life, and property damage due to a lack of proper assessment and appropriate strengthening measures. An analysis of the seismic vulnerability of existing old Newari brick masonry buildings in the Pokhara Valley is presented. These buildings were built using indigenous knowledge and technology. The investigation is based on analytical studies, with some material properties obtained from field tests. Proper modeling of a masonry structure is crucial for reliable seismic resistance and structural design. However, modeling a real masonry structure is a challenging and computationally demanding task due to its complicated framework, requiring in-depth knowledge, realistic material properties, and relevant information. The aim of this research is to assess the seismic performance of old Newari masonry buildings using stress level and fragility curves. The research issues are addressed analytically through linear time history analysis using the finite element program-based software Sap 2000 v20. In dynamic analysis, numerical building models were subjected to three synthetic earthquakes. The performance status of the building based on various stress levels is evaluated, and weak regions are identified. The fragility curve of the structure is assessed, considering the ground motion parameters in the locality. The fragility function is plotted with the probability of failure at an interval of 0.10 g. The results of the analysis highlight that the studied structure is vulnerable compared to the codal provisions and standard recommendations.

Большинство сооружений в Непале, включая административные и жилые здания, выполнены из камня. Их конструкции уязвимы во время землетрясений, о чем свидетельствуют масштабные повреждения и человеческие жертвы из-за отсутствия надлежащей оценки и соответствующих мер по укреплению. Представлен анализ сейсмической уязвимости существующих зданий из кирпича в традиционном стиле Ньюари, находящихся в долине Покхара. Эти здания были построены с использованием методов и технологий коренного населения. Исследование основано на аналитических расчетах, при этом некоторые свойства материалов были получены в результате полевых испытаний. Эффективное моделирование каменной кладки имеет решающее значение в проектировании надежной и сейсмостойкой конструкции. Однако моделирование реальной каменной конструкции является неординарной и затратной в вычислительном плане задачей из-за сложной структуры, требующей углубленного анализа, реалистичных свойств материала и актуальных данных. Целью данного исследования является определение сейсмических характеристик старых кирпичных зданий в стиле Ньюари с использованием кривых пределов напряжений и сейсмоустойчивости. Задачи исследования решаются с помощью линейного динамического анализа с использованием программного обеспечения на основе конечных элементов Sap 2000 v20. Конечно-элементные модели зданий были испытаны на трех землетрясениях. Дана оценка эксплуатационного состояния здания на основе различных уровней нагрузки и выявлены слабые участки. Проанализирована кривая предела сейсмоустойчивости конструкции с учетом параметров движения грунта в данной местности. Функция предела сейсмоустойчивости построена с вероятностью разрушения с интервалом 0,10 g. Результаты расчетов подтверждают, что исследуемая конструкция уязвима в сравнении с положениями строительных норм и правил.

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