scholarly journals The Effects of Construction Techniques and Geometrical Properties on the Dynamic Behavior of Historic Timber Minarets in Sakarya, Turkey

2018 ◽  
Vol 2018 ◽  
pp. 1-12
Author(s):  
M. Bilal Bağbancı ◽  
Özlem Köprülü Bağbancı
Keyword(s):  
Dynamic Behavior ◽  
Body Height ◽  
Outer Wall ◽  
Ambient Vibration ◽  
Construction Technique ◽  
Cross Sectional ◽  
Geometrical Properties ◽  
Ambient Vibration Tests ◽  
Construction Techniques ◽  
Earthquake Zone

Sakarya City, as the host of many civilizations, has many historic monuments. The city is in the most active earthquake zone in the region. The minarets of mosques are the most important structures because they are slender. Therefore, they are sensitive to lateral loads, and earthquakes and strong winds may cause damage to these structures. The highest number of mosque minarets partly or totally collapsed in the 1999 Kocaeli and Düzce earthquakes that occurred in Turkey. The region is rich in trees, so timber has been used in the construction of different structures in Sakarya City and the vicinity for many years. In this study, five historic timber minarets in Sakarya City were experimentally and computationally examined to determine the effects of the construction techniques and geometrical properties on the dynamic behavior of the minarets. Ambient vibration tests of timber minarets were performed, and the construction techniques and geometrical features were examined; the results of these are discussed below. It was determined that the outer wall construction technique, body height, slenderness, and cross-sectional area play important roles in the dynamic behavior of timber minarets. Finally, an empirical formula was derived from the relationships for rapid estimation of the fundamental period of timber minarets.

Ambient vibrations for the assessment of the strengthening intervention of a masonry barrel vault

2020 ◽  
pp. 147592172095206
Author(s):  
Alice Di Primio ◽  
Noemi Fiorini ◽  
Daniele Spina ◽  
Claudio Valente ◽  
Marcello Vasta
Keyword(s):  
Dynamic Behavior ◽  
Ambient Vibration ◽  
Structural Monitoring ◽  
Mode Shapes ◽  
Modal Assurance Criterion ◽  
Existing Structures ◽  
Ambient Vibration Tests ◽  
2009 L’Aquila Earthquake ◽  
Historical Heritage ◽  
Vibration Tests

Vibration-based structural monitoring is a fundamental tool to assess the conditions of existing structures, in their real operating state. In particular, as concerns masonry buildings, although a large part of the Italian and European historical heritage is composed of vaulted structures, comparatively few papers in the literature are targeted to the study of the dynamic behavior of vaulted systems. The present work focuses on the application of vibration-based structural monitoring to a barrel vault of the Bussi Castle, located in Pescara, Italy, which suffered some damages as a consequence of the 2009 L’Aquila earthquake. Ambient vibration tests were carried out in the damaged state and after repair and strengthening of the vault for evaluating its dynamic behavior in both states. In either conditions, the modal parameters of the vault were identified using operational modal analysis techniques. The comparison of the modes in the two states, carried out with Modal Assurance Criterion index, clearly indicates an enhancement of dynamic behavior of the consolidated vault. In particular, a new index named Modal Symmetry Index is introduced. The index is based on a proper ratio between mode shapes to evaluate the improvement of the structural symmetry after the restoration interventions. The results confirm the effectiveness of the devised index to evaluate the strengthening interventions and, the potential of the structural monitoring to control the behavior of damaged vaulted masonry systems.

scholarly journals Dynamic characterization of a heritage construction from 19th century

2018 ◽  
Vol 11 (1) ◽  
pp. 52-75 ◽  
Author(s):  
F. BRANDÃO ◽  
E. MESQUITA ◽  
A. DIÓGENES ◽  
P. ANTUNES ◽  
H. VARUM
Keyword(s):  
Dynamic Behavior ◽  
19Th Century ◽  
Natural Frequencies ◽  
Ambient Vibration ◽  
Structural Dynamic ◽  
The North ◽  
Ambient Vibration Tests ◽  
Heritage Constructions ◽  
Vibration Tests ◽  
The 19Th Century

Abstract Heritage constructions presents high significance and importance for society. As way of contribution for the preservation of the heritage constructions, this paper presents a study on the dynamic behavior of a heritage construction, part of the historic center of Sobral city, located at the north region of Ceará State, namely the Nossa Senhora das Dores Church, a church from the beginning of the 19th century, built in clay brick walls. In this study, ambient vibration tests were performed aiming to obtainment of the natural frequencies of the building focusing the calibration of the numerical model and, from it, proceeding with modal analysis by Finite Element Method (FEM) with recurrence to software Ansys®. The results allowed the analysis of the structural dynamic behavior taking into account natural frequencies, modal shapes and directional displacements.

scholarly journals Lime-Crusted Rammed Earth: Materials Study

2013 ◽  
Vol 831 ◽  
pp. 9-13
Author(s):  
Camilla Mileto ◽  
Fernando Vegas ◽  
Francisco Javier Alejandre ◽  
Juan Jesús Martín ◽  
Lidia García Soriano
Keyword(s):  
Outer Wall ◽  
Rammed Earth ◽  
Architectural Heritage ◽  
Construction Technique ◽  
Materials Analysis ◽  
Vast Array ◽  
Construction Techniques ◽  
Rammed Earth Wall ◽  
Wall Construction ◽  
Materials Used

This study analyses the durability of rammed-earth wall construction techniques. The analysis focuses on three medieval masonry types from the Castle of Villavieja (Castellón, Spain) using two variations of lime-reinforced rammed earth in its walls: lime-crusted rammed earth and brick-reinforced rammed earth. Materials analysis reveals the good properties of the materials used in the outer wall facing despite its age. It also clearly shows how deterioration depends more on the construction technique (construction of the wall with a base, cornice, facings, core; on-site installation, bonds, etc.) than on the material itself. These two types of lime-reinforced rammed earth (lime-crusted rammed earth and brick-reinforced rammed earth) are the most common kinds of fortified architecture in the Iberian Peninsula as well as in northern Africa and the Middle East. The case presented herein is therefore highly relevant as it advances our knowledge of the behaviour of the materials comprising these walls and lays the foundations for suitable future conservation works of a vast array of architectural heritage.

Comparison of Cross-sectional Geometrical Properties and Bone Density between Saint-Bernard and other Giant Breed Dogs

2019 ◽  
Author(s):  
S. Mejia ◽  
A. Iodence ◽  
L. Griffin ◽  
S.J. Withrow ◽  
M. Salman ◽  
...  
Keyword(s):  
Bone Density ◽  
Cross Sectional ◽  
Geometrical Properties ◽  
Saint Bernard

scholarly journals Examination of Construct Validity and Criterion-Related Validity of the German Motor Test in Egyptian Schoolchildren

2021 ◽  
Vol 18 (16) ◽  
pp. 8341
Author(s):  
Osama Abdelkarim ◽  
Julian Fritsch ◽  
Darko Jekauc ◽  
Klaus Bös
Keyword(s):  
Construct Validity ◽  
Physical Fitness ◽  
Large Scale ◽  
Body Height ◽  
Cross Sectional Study ◽  
Latent Factors ◽  
Cross Sectional ◽  
First Order ◽  
Motor Test ◽  
Health Related

Physical fitness is an indicator for children’s public health status. Therefore, the aim of this study was to examine the construct validity and the criterion-related validity of the German motor test (GMT) in Egyptian schoolchildren. A cross-sectional study was conducted with a total of 931 children aged 6 to 11 years (age: 9.1 ± 1.7 years) with 484 (52%) males and 447 (48%) females in grades one to five in Assiut city. The children’s physical fitness data were collected using GMT. GMT is designed to measure five health-related physical fitness components including speed, strength, coordination, endurance, and flexibility of children aged 6 to 18 years. The anthropometric data were collected based on three indicators: body height, body weight, and BMI. A confirmatory factor analysis was conducted with IBM SPSS AMOS 26.0 using full-information maximum likelihood. The results indicated an adequate fit (χ2 = 112.3, df = 20; p < 0.01; CFI = 0.956; RMSEA = 0.07). The χ2-statistic showed significant results, and the values for CFI and RMSEA showed a good fit. All loadings of the manifest variables on the first-order latent factors as well as loadings of the first-order latent factors on the second-order superordinate factor were significant. The results also showed strong construct validity in the components of conditioning abilities and moderate construct validity in the components of coordinative abilities. GMT proved to be a valid method and could be widely used on large-scale studies for health-related fitness monitoring in the Egyptian population.

scholarly journals Ambient Vibration Tests of an Arch Dam with Different Reservoir Water Levels: Experimental Results and Comparison with Finite Element Modelling

2014 ◽  
Vol 2014 ◽  
pp. 1-12 ◽  
Author(s):  
Sergio Vincenzo Calcina ◽  
Laura Eltrudis ◽  
Luca Piroddi ◽  
Gaetano Ranieri
Keyword(s):  
Finite Element ◽  
Natural Frequencies ◽  
Water Levels ◽  
Arch Dam ◽  
Experimental Results ◽  
Ambient Vibration ◽  
Reservoir Water ◽  
Ambient Vibration Tests ◽  
Vibration Properties ◽  
Vibration Tests

This paper deals with the ambient vibration tests performed in an arch dam in two different working conditions in order to assess the effect produced by two different reservoir water levels on the structural vibration properties. The study consists of an experimental part and a numerical part. The experimental tests were carried out in two different periods of the year, at the beginning of autumn (October 2012) and at the end of winter (March 2013), respectively. The measurements were performed using a fast technique based on asynchronous records of microtremor time-series. In-contact single-station measurements were done by means of one single high resolution triaxial tromometer and two low-frequency seismometers, placed in different points of the structure. The Standard Spectral Ratio method has been used to evaluate the natural frequencies of vibration of the structure. A 3D finite element model of the arch dam-reservoir-foundation system has been developed to verify analytically determined vibration properties, such as natural frequencies and mode shapes, and their changes linked to water level with the experimental results.

scholarly journals The Accuracy of Broselow Tape Weight Estimate among Pediatric Population

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Turki M. AlHarbi ◽  
Abdullaziz AlGarni ◽  
Fasial AlGamdi ◽  
Mona Jawish ◽  
Tariq Ahmad Wani ◽  
...  
Keyword(s):  
Body Weight ◽  
Pediatric Population ◽  
Body Height ◽  
Age Groups ◽  
Cross Sectional Study ◽  
The Body ◽  
Accurate Estimation ◽  
Cross Sectional ◽  
Actual Weight ◽  
Medical City

Objective.To determine the accuracy of the Broselow Tape (BT) versions 2007 and 2011 in estimating weight among pediatric population.Methods.A cross-sectional study was conducted at King Fahad Medical City and six schools across Riyadh province on 1–143-month-old children. BT 2007 and 2011 estimated weights were recorded. Both tapes via the child’s height produce an estimated weight, which was compared with the actual weight.Results.A total of 3537 children were recruited. The height (cm) of the subjects was97.7±24.1and the actual weight (kg) was16.07±8.9, whereas the estimated weight determined by BT 2007 was15.87±7.56and by BT 2011 was16.38±7.95. Across all the five age groups, correlation between actual weight and BT 2007 ranged between 0.702 and 0.788, while correlation between actual weight and BT 2011 ranged between 0.698 and 0.788. Correlation between BT 2007 and BT 2011 across all the five age groups ranged from 0.979 to 0.989. Accuracy of both the tape versions was adversely affected when age was >95 months and body weight was >26 kilograms.Conclusions.Our study showed that BT 2007 and 2011 provided accurate estimation of the body weight based on measured body height. However, 2011 version provided more precise estimate for weight.

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