Article

Sönüm Oranlarının Tarihi Bir Yığma Konukevi Binasının Sismik Davranışına Etkisi

Article

Sönüm Oranlarının Tarihi Bir Yığma Konukevi Binasının Sismik Davranışına Etkisi

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Earthquakes have underlined the need for health monitoring and safety assessment of engineering structures in general and especially historical heritage. These structures can be exposed to many different loads such as earthquake and wind that may cause the deterioration and loss of structural integrity. In this study, ambient vibration-based system identification of Zağanos Bastion is carried out for health assessment using linear and nonlinear analyses. 3D finite element analyses of the bastion are performed using relievo drawings and analytical dynamic characteristics are obtained. Ambient vibration tests are conducted on the bastion and experimental dynamic characteristics such as natural frequencies, mode shapes and damping ratios are determined. Enhanced Frequency Domain Decomposition Method in the frequency domain and Stochastic Subspace Identification Method in the time domain are used to extract the experimental dynamic characteristics. Maximum differences are minimized using some uncertain parameters to obtain the updated finite element model. Linear and nonlinear time history analyses are carried out using 1999 Kocaeli earthquake ground motion record to display the maximum displacements, stresses and local damage regions with detail. This study suggests that minor damage at the connection points and exterior surface will sustain under destructive earthquakes.
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Determining the structural behavior of masonry structures is a challenge due to their lack of homogeneity. The seismic behavior of masonry structures is especially complex. The aim of this study was to examine the structural behavior of Zağanos Bastion using both experimental and numerical methods. The Operational Modal Analysis technique, including the Enhanced Frequency Domain Decomposition Method, and the Stochastic Subspace Identification Method were used to illustrate experimentally the dynamic characteristic of the bastion. A finite element model was developed using ANSYS software in order that the dynamic characteristics of the bastion, including natural frequencies and mode shapes, could be calculated numerically. Seismic analysis was carried out using the 1999 Kocaeli earthquake ground motion record to determine the linear and nonlinear seismic behavior of the bastion. The Turkish Earthquake Code and its general technical specifications were used to evaluate the seismic results. The results show that the maximum and minimum principal stresses exerted on the masonry components exceeded the code requirements at some points, but in general the requirements for the stresses were satisfied.
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The current study investigates the dynamic characteristics of two historical monuments in Cyprus, the St. Nicholas Cathedral in Famagusta and the St. Mamas Church in Morphou. The testing was performed using the ambient vibration survey approach and the output-only method for both structures, to obtain the frequencies and mode shapes of the lower modes. These results contributed in the updating of the finite element models and in the planning of the monitoring strategy that was implemented for these structures, as well as the study for their seismic vulnerability. Comparisons are made between the measured and finite element model dynamic characteristics, and conclusions are drawn.
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Historical masonry structures have seismic vulnerability and most damages and demolishes arise from the seismic actions like earthquakes. In this paper, the structural behavior of Zağanos Bastion is examined with experimental and numerical methods. The operational modal analysis technique is used to illustrate the dynamic characteristics of the bastion experimentally. Finite element model is developed by ANSYS software and dynamic characteristics of the bastion, such as natural frequencies and mode shapes are calculated numerically. Furthermore, time history seismic analysis is carried out. The results show that the ambient vibration measurements are enough to identify the structural response of the bastion. Maximum differences between the natural frequencies are attained as 26%. To minimize these differences, finite element model of the bastion should be updated by using some uncertain parameters. The principal stresses are satisfied in general, but the maximum tensile and compression stresses values exceed the allowable code limits at some points of the masonry components.
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The paper presents the results of a large experimental programme carried out on models, scaled 1:2, of two-storey masonry buildings. After suffering damage, the models were repaired and strengthened and tested again. A total of 24 buildings were subjected to 119 shaking-table tests, by ISMES (Italy) and LEE (Greece) facilities. The results allow to assess the efficiency of the various strengthening techniques employed and to describe the change of dynamic properties of the systems at the increase of damage. © 1998 John Wiley & Sons, Ltd.
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The paper is devoted to stone masonry structures in view of possible improvement of their dynamic-seismic resistance and durability. Many existing structures and large models were investigated by the authors in the framework of national and international research projects. The investigation of a large stone masonry model, tested on the shaking table, had as main purpose the evaluation of the behaviour of new and rehabilitated masonry structures reinforced with polymer grids produced in the European Union. The test plan consisted of the following parts: tests of individual material properties; seismic tests of a masonry model reinforced with polymer grids inserted horizontally in prescribed bed joints; seismic tests of a masonry model reinforced on parts of a wall surface by vertical polymer grids bonded with fibre-reinforced plaster. The paper presents the selected representative results and synthesis of obtained data. The polymer grids and fibre mortars enhance the seismic resistance of stone masonry structures. They contribute also to the durability of historical and other stone masonry structures, especially in cases of vertical polymer grids combined with fibre lime–cement plaster.
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The results of the ambient-vibration based investigations carried out to assess the structural conditions of a masonry bell-tower are presented. The tower, dating back to the XVII century and about 74 m high, is characterised by the presence of major cracks on the western and eastern load-bearing walls.The assessment procedure includes full-scale ambient vibration testing, modal identification from ambient vibration responses, finite element modelling and dynamic-based identification of the uncertain structural parameters of the model. A good match between theoretical and experimental modal parameters was reached for relatively low stiffness ratios in the most damaged regions of the tower. Furthermore, the model identification, carried out by using two different methods, provided consistent structural parameters which are also in close agreement with the available characterization of the materials.
Dassault systémes simulia corp
  • Abaqus
Abaqus, (2016). Dassault systémes simulia corp. Providence: Rhode Island, USA.
Shaking table tests on two multi-leaf stone masonry buildings
  • N Mazzon
  • M R Valluzzi
  • T Aoki
  • E Garbin
  • G De Canio
  • N Ranieri
  • C Modena
Mazzon, N, Valluzzi, M.R., Aoki, T., Garbin, E., De Canio, G., Ranieri, N., Modena, C. (2009). Shaking table tests on two multi-leaf stone masonry buildings, In: Proceeding of 11th