Seismic Safety Assessment of the “Tekyeh Amir Chakhmagh” by Simplified Kinematic Limit Analysis

2010 ◽  
Vol 133-134 ◽  
pp. 653-658
Author(s):  
Seyed Rohollah Pashanejati ◽  
Climent Molins
Keyword(s):  
Limit Analysis ◽  
Safety Assessment ◽  
Failure Mechanisms ◽  
Three Dimensional ◽  
Masonry Buildings ◽  
Seismic Safety ◽  
Early 19Th Century ◽  
Analysis And Design ◽  
Macro Block ◽  
Kinematic Limit

This paper presents an investigation about the capabilities of simplified kinematic limit analysis for the safety evaluation and for the design of strengthening of masonry historical buildings. Limit analysis allows, with a reduced number of mechanical properties and for a given ultimate condition of the structure, affordable safety analysis and design of strengthening to the practitioners. Masonry buildings subjected to earthquake show in most cases local failure mechanisms rather than global failure mechanisms due to the lack of integrity of structure. For this reason, simplified kinematic limit analysis has been accepted as a method to design the strengthening of masonry buildings, according to the Italian Ordinance (O.P.C.M. 3431). To validate the applicability of this method, its results had been compared with those provided by three dimensional macro block limit analysis (Bustamante, 2003) for the Via Arizzi house. It is worth noting that results of simplified kinematic limit analysis provided similar results as those achieved by 3D macro block. Also this method was implemented to seismic safety assessment of Tekyeh Amir Chakhmagh in Iran based on the results obtained for the out of plane and in plane behaviour of walls. Tekyeh Amir Chakhmagh is an early 19th century tiled edifice that was built to serve as grand-stand for watching religious rites and also provided an imposing entrance to Amir Chakhmagh bazaar. This stunning three-story facade of the building is one of the most recognizable and unusual buildings in Iran.

Seismic Assessment of the Superstructure of the Naghareh Khaneh Edifice after Base Isolation by Simplified Kinematic Limit Analysis

2010 ◽  
Vol 133-134 ◽  
pp. 677-682
Author(s):  
Mahmood Golabchi ◽  
Peyman Homami ◽  
Seyed Rohollah Pashanejati
Keyword(s):  
Limit Analysis ◽  
Base Isolation ◽  
Failure Mechanisms ◽  
Safety Evaluation ◽  
Main Body ◽  
Base Shear ◽  
Historical Building ◽  
Seismic Safety ◽  
Complementary Method ◽  
Kinematic Limit

The limitation of intervention in historical buildings is one of the basic challenges for choosing a strengthening method. Base isolation is one of the best methods which can satisfy such limitations. Although there is a probability to reduce base shear and have negligible drift by base isolating, but it is very important to make sure that the integrity of superstructure reliably stands against the induced acceleration. Lack of integrity leads to local failure mechanisms rather than global failure mechanisms in masonry buildings. For this reason, simplified kinematic limit analysis has been selected as a method in earthquake safety assessment. This paper presents an investigation about the capabilities of simplified kinematic limit analysis as a complementary method, for the seismic safety evaluation of the superstructure of a base isolated masonry historical construction. This method has been applied on the “Naghareh Khaneh” edifice. The Naghareh Khaneh is a masonry historical building in Iran which was constructed around 400 years ago. The main body of this study focuses on the vulnerability assessment of the superstructure after using isolators on the base and the efficiency of simplified kinematic limit analysis will be discussed which shall be based on the results obtained from the out of plane and in plane behaviour of walls after installing isolators and dampers on the base of the Naghareh Khaneh structure.

Kinematic limit analysis of three-dimensional unsaturated soil slopes reinforced with a row of piles

2020 ◽  
Vol 120 ◽  
pp. 103428 ◽  
Author(s):  
Long Wang ◽  
De'an Sun ◽  
Yangping Yao ◽  
Lizhou Wu ◽  
Yongfu Xu
Keyword(s):  
Unsaturated Soil ◽  
Limit Analysis ◽  
Three Dimensional ◽  
Kinematic Limit ◽  
Soil Slopes

M-N Interaction Effect on the Frames Failure Mechanisms

2016 ◽  
Vol 847 ◽  
pp. 248-256 ◽  
Author(s):  
Giuseppe Buonocore ◽  
Antonio Gesualdo ◽  
Antonino Iannuzzo ◽  
Mariano Modano ◽  
Michela Monaco ◽  
...  
Keyword(s):  
Limit Analysis ◽  
Safety Assessment ◽  
Ultimate Load ◽  
Failure Mechanisms ◽  
Bending Moment ◽  
Significant Parameter ◽  
Economical Design ◽  
Computationally Expensive ◽  
Idealised Model ◽  
Careful Assessment

The collapse factor is a significant parameter in the framework of the safety assessment and economical design of ductile structures. This fact draws attention to the necessity of a careful assessment of the limit analysis approaches. The kinematics in these structures arises in fact from the actual rotation of the plastic hinges under axial force and bending moment. It can be shown that it is possible to obtain a reliable tool capable of competing with computationally expensive methodologies. The application of the methods of limit analysis involves a simplified and idealised model of the structure and, notwithstanding the fact that hundreds of papers have been devoted to the topic, some consequences of apparently unimportant simplifications still seem to have not been properly and firmly highlighted. This paper investigates the ultimate load and collapse modes of steel frames under combined vertical and horizontal forces through limit analysis.

scholarly journals Force-Based Seismic Evaluation of Retrofitting Interventions of Historic Masonry Castles by 3D Rigid Block Limit Analysis

2020 ◽  
Vol 10 (15) ◽  
pp. 5035
Author(s):  
Lucrezia Cascini ◽  
Giuseppe Brando ◽  
Francesco P. A. Portioli ◽  
Morena Rita Forgione ◽  
Claudio Mazzanti ◽  
...  
Keyword(s):  
Limit Analysis ◽  
Failure Modes ◽  
Three Dimensional ◽  
Historical Analysis ◽  
Quantitative Measure ◽  
Rigid Block ◽  
Seismic Evaluation ◽  
Seismic Capacity ◽  
Seismic Safety ◽  
Historic Masonry

This paper deals with the force-based assessment of collapse mechanisms and strengthening interventions of the historic masonry castle “Bussi sul Tirino” (Abruzzi, Italy) using rigid block limit analysis (RBLA). The structure, which is a fortified palace dating back to the 11th century, has experienced severe earthquakes over the centuries and was hit once again in 2009 by the L’Aquila earthquake. Based on the historical analysis and the results of in situ investigations, a spatial rigid block model of an entire structural unit was generated using the in-house software LiABlock_3D. The software is a MATLAB® based tool for three-dimensional RBLA, which provides as outputs collapse failure modes and collapse load multipliers. In addition, a specific routine was developed for the purpose of the study to compute the participating mass ratio and the spectral acceleration that activated the failure mechanisms. The results of the numerical analysis were used to address three different retrofitting interventions, based on the use of connection elements and ties that, according to the minimum intervention principle, progressively enhanced the seismic capacity. Comparisons in terms of seismic safety indices are finally provided in order to give a quantitative measure of the effectiveness of the adopted retrofitting strategies.

Three-dimensional stability of compound slope using limit analysis method

2019 ◽  
Vol 56 (1) ◽  
pp. 116-125 ◽  
Author(s):  
Long Wang ◽  
De’an Sun ◽  
Lin Li
Keyword(s):  
Limit Analysis ◽  
Failure Mechanisms ◽  
Three Dimensional ◽  
Analysis Method ◽  
Soil Slope ◽  
Current Limit ◽  
Wide Range ◽  
Inclination Angles ◽  
The Stability ◽  
Limit Analysis Method

This paper investigates three-dimensional (3D) stability of a compound soil slope with two inclination angles using the limit analysis method. The current limit analysis involves the toe-failure, face-failure, and base-failure mechanisms of the slope, all of which are possible 3D failure mechanisms. By reducing the current compound slope to a simple slope, the validity and efficiency of the present analysis are examined by comparing the current results with published solutions. The 3D stability of a compound soil slope is studied schematically for a wide range of parameters, and the stability charts are presented. The effects of slope shape (i.e., concave and convex shapes) and depth coefficient on the slope stability are investigated graphically. The graphs of critical failure surfaces are also presented to demonstrate the effects of slope shape and depth coefficient on the failure mechanism of a compound soil slope.

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