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Information Journal Paper

Title

SEISMIC SAFETY EVALUATION OF TABRIZ ALISHA HISTORICAL CITADEL USING FINITE ELEMENT AND SIMPLIFIED KINEMATIC LIMIT ANALYSES

Pages

  91-102

Abstract

 Currently, there are a lot of powerful FEM packages which are used for different types of analysis of structures. However, using these softwares for assessment of seismic safety and strengthening of historical masonry buildings are envolved with some problems. Complex building geometry, low information about physical and mechanical properties of materials, lack of precise information about composing material of internal parts of thick elements, prohibition of execution of destructive tests on these buildings, consumpsion of considerable cost and time for analysis process are some of the problems for engineers and researchers working professionally on numerical modelling of HISTORICAL BUILDINGs. The structural analysis of the Citadel was approached by a 3D finite element model based on the concepts of homogenized material and smeared crack modeling using the ANSYS code v.10.0. The nonlinear behavior of the masonry was represented by combining plasticity with a smeared crack approach. The perfectly-elastic plastic behavior with the Drucker-Prager (DP) yield surface was used to reproduce the plasticity properties, whereas the Willam-Warnke (WW) failure surface was considered for model crush and cracking. Through different analyses carried out with ANSYS software, the following results were obtained:While the gravity capacity of the structure is high, its lateral resistance to equivalent static loading is not enough.Dynamic bearing capacity of the structure in y direction, along wing walls, is less than x direction, along web walls. One reason for this may be the existence of numerous cracks scattered in the web wall. Therefore, web wall has the most vulnerable wall in comparison with two other walls.The seismic sensitivity of two wing walls is different. Vulnerability of East wing wall under x direction excitation and vulnerability of west wall under y direction earthquake are higher.Arge Tabriz walls remains stable up to 0.25g for both Chi-Chi and Erizincan accelerograms. However, the structure loses its stability in 0.3g while according to historical documents and a recent investigation, the Maximum considered earthquake for Tabriz could be as high as 0.64g.SIMPLIFIED KINEMATIC LIMIT ANALYSIS (SKLA) is a powerful method for the analysis of HISTORICAL BUILDINGs. This method is recommended for strengthening of historical masonry buildings in Italian O.P.C.M.3431 ordinance. Applied rules in this method are based on virtual work principle.In this paper, this method (SKLA) capability for assessing the seismic safety of TABRIZ ALISHA CITADEL is investigated. For this, the results of analysese of this building by two methods of SKLA and FEM are compared. The comparison of the results of two methods has shown acceptable accordance. High analysis speed and being free of precise mechanical properties of the buildings material are main features of SKLA method. However, tracing the magnitude of stresses and deflections in different points, revealing collapse time and sequence of fracture of walls are main features of FEM. It seems that the SKLA can be utilized as a high speed and low cost tool for primary assessment of seismic safety of masonry buildings.

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    APA: Copy

    HOSSEINI, M., POURAMINIAN, M., & SADEGHI, A.. (2016). SEISMIC SAFETY EVALUATION OF TABRIZ ALISHA HISTORICAL CITADEL USING FINITE ELEMENT AND SIMPLIFIED KINEMATIC LIMIT ANALYSES. MODARES CIVIL ENGINEERING JOURNAL, 16(2), 91-102. SID. https://sid.ir/paper/256841/en

    Vancouver: Copy

    HOSSEINI M., POURAMINIAN M., SADEGHI A.. SEISMIC SAFETY EVALUATION OF TABRIZ ALISHA HISTORICAL CITADEL USING FINITE ELEMENT AND SIMPLIFIED KINEMATIC LIMIT ANALYSES. MODARES CIVIL ENGINEERING JOURNAL[Internet]. 2016;16(2):91-102. Available from: https://sid.ir/paper/256841/en

    IEEE: Copy

    M. HOSSEINI, M. POURAMINIAN, and A. SADEGHI, “SEISMIC SAFETY EVALUATION OF TABRIZ ALISHA HISTORICAL CITADEL USING FINITE ELEMENT AND SIMPLIFIED KINEMATIC LIMIT ANALYSES,” MODARES CIVIL ENGINEERING JOURNAL, vol. 16, no. 2, pp. 91–102, 2016, [Online]. Available: https://sid.ir/paper/256841/en

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