Dynamic Characteristic Investigation of a Historical Masonry Building and Surrounding Ground in Kathmandu

Parajuli, Hari Ram; Kiyono, Junji; Tatsumi, Masatoshi; Suzuki, Yoshiyuki; Umemura, Hisashi; Taniguchi, Hiroki; Toki, Kenzo; Furukawa, Aiko; Maskey, Prem Nath

doi:10.20965/jdr.2011.p0026

Cited by 7 publications

(5 citation statements)

References 8 publications

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“…The results indicated that the modal shapes using the solid model configuring the wall thickness and openings corresponded well with the measured results (Bayraktar et al, 2009). Parajuli et al conducted a microtremor measurement in a 2-story historic masonry house building in Lalitpur, Kathmandu Valley, and investigated the dependency of wall openings on the identified predominant frequency (Parajuli et al, 2011). Furukawa et al conducted microtremor measurements of a target masonry building in Nepal before and after the Nepal earthquake to identify practical vibration characteristics and validate the numerical simulation results (Furukawa et al, 2017).…”

Section: Introductionsupporting

confidence: 59%

Investigation of microtremors observed at historic masonry townhouse buildings after Nepal earthquake

Mukai

Hoshino²,

Yamamoto

et al. 2022

Front. Built Environ.

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The Gorkha earthquake in 2015 was a recent large-scale earthquake that caused severe damage to many historic masonry buildings in the Kathmandu Valley, Nepal. The authors conducted a visual inspection survey of seismically damaged buildings after the earthquake in the historic town district of Bhaktapur in the Kathmandu Valley. The first part of this paper reports the distribution of the historic masonry buildings for each damage level in the surveyed area. A concentrating zone of severely-damaged buildings was explicitly found in the damage-level distribution map. Almost half of all the surveyed buildings were severely damaged during the earthquake, and most of these were historic masonry townhouse buildings. In the second part, the ambient vibration characteristics of the conventional historic masonry buildings in Bhaktapur are investigated. Typical dwelling houses in a historic town district in Nepal, which generally formed terraced houses built around a courtyard, were targeted for the measurement. Thus, the influence of adjacent buildings, which makes it difficult to identify the predominant natural frequencies from building vibration measurements, was also observed. Microtremor measurements using two accelerometers were conducted at 11 historic masonry buildings to investigate the discrimination degree for identifying the predominant natural frequency of conventional townhouse buildings. The estimated primary natural frequencies of these buildings were compared with the results of the screening model analysis. The advantages of using the proposed screening model analysis to improve the uncertainty of the first natural frequency identification by the microtremor measurement are discussed. Additional measurements of the microtremors at 4 of the 11 measured buildings were conducted using a different location combination of the two acceleration sensors. The sensors were placed between two different floors, and the transfer functions of each floor were investigated to observe the predominant vibration components on the floors in the entire building. Moreover, the coherence values observing the in-plane correlation of the floor responses were also analyzed for the dataset measured at two points separated on the same floor. Finally, an effective method for measuring the microtremors is discussed to improve the assessment of the vibration characteristics of conventional historic masonry buildings in Nepal.

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Section: Introductionsupporting

confidence: 59%

Investigation of microtremors observed at historic masonry townhouse buildings after Nepal earthquake

Mukai

Hoshino²,

Yamamoto

et al. 2022

Front. Built Environ.

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“…But the value of Young"s modulus for mud-mortar brick masonry adopted by Jaishi et al [97] was taken from the research conducted by Tomazevic et al [116]. Parajuli et al [117] performed non-destructive testing (acoustic emission test), in order to evaluate the properties of masonry in traditional brick masonry houses constructed in the same period that the temples and the results are summarized in Table 3.4. The Results…”

Section: Materials Properties Of Structural Componentsmentioning

confidence: 99%

“…show that the Young"s modulus of wall decrease with the increase in wall thickness, this is due to increase in the joints and voids inside the wall with increase in wall thickness, resulting in sharply reducing its strength [117]. Nienhuys [105] in his report "Options for Reconstruction and Retrofitting of Historic Pagoda Temples" calculated the overall weight of Narayan temple, adopting for the specific weight of the materials the values summarized in Table 3.5.…”

Section: Materials Properties Of Structural Componentsmentioning

confidence: 99%

Seismic Vulnerability Assessment of Slender Masonry Structures

Shakya

2015

Handbook of Research on Seismic Assessment and Rehabilitation of Historic Structures

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Existing slender masonry structures, such as Pagoda temples, towers, minarets and chimneys, exist all over the world and constitute a relevant part of the architectural and cultural heritage of humanity. Their protection against earthquakes is a topic of great concern among the earthquake engineering research community. This concern mainly arises from the strong damage or complete loss suffered by these types of structures when subjected to earthquake and also from the need and interest to preserve them. This chapter firstly presents a methodology for assessing the seismic vulnerability of slender masonry structures based on vulnerability index evaluation method. Secondly, presents the correlation between vulnerability index and Macroseismic method to estimate the physical damage in relationship with seismic intensity. Finally, presents implementation of the methodology to construct vulnerability curves, fragility curves and estimate losses.

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“…Since 2007, the authors undertook research to assess the seismic safety of existing historic masonry buildings in Kathmandu (Parajuli et al, 2007(Parajuli et al, , 2010(Parajuli et al, , 2011Furukawa et al, 2012). First, probabilistic seismic hazard analysis (PSHA) was conducted for Kathmandu (Parajuli et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

“…Next, a 300-year-old two-story masonry building located in Jhatapol within the Patan district was selected as a target building for a typical low-strength masonry building, and its vibrational characteristics were investigated through microtremor observations in 2009. The first-and second-mode natural frequencies and firstmode damping ratio were evaluated from acceleration measurements (Parajuli et al, 2011). Then, a finite element model of the target building was created to simulate the seismic behavior (Parajuli et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Damage to a Historic Masonry Building in Nepal through Comparison of Dynamic Characteristics before and after the 2015 Gorkha Earthquake

Furukawa

Kiyono

Parajuli

et al. 2017

Front. Built Environ.

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On April 25, 2015, a M w 7.8 earthquake struck the Gorkha district of Kathmandu, Nepal. In Patan, vibrational characteristics of a 300-year-old two-story masonry building near Patan Durbar Square had been measured prior the Gorkha earthquake. In the inspection of the building after the Gorkha earthquake, several new cracks were found. The vibrational characteristics of the building were measured again, and it was found that the natural frequencies after the earthquake were smaller than those before the earthquake, indicating the reduction of the stiffness. Finite element models of the structure representing pre-and post-earthquake conditions are established so that the natural frequencies match the pre-and post-earthquake measurements and the structural damage is identified based on the stiffness reduction. Finally, the dynamic analysis of the finite element model of the building in the pre-earthquake condition using the observed ground motion record during the Gorkha earthquake as the input is conducted, and the structural response of the building during the Gorkha earthquake is discussed.

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Dynamic Characteristic Investigation of a Historical Masonry Building and Surrounding Ground in Kathmandu

Cited by 7 publications

References 8 publications

Investigation of microtremors observed at historic masonry townhouse buildings after Nepal earthquake

Investigation of microtremors observed at historic masonry townhouse buildings after Nepal earthquake

Seismic Vulnerability Assessment of Slender Masonry Structures

Evaluation of Damage to a Historic Masonry Building in Nepal through Comparison of Dynamic Characteristics before and after the 2015 Gorkha Earthquake

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