Damage as a measure for earthquake-resistant design of masonry structures: Slovenian experienceThis article is one of a selection of papers published in this Special Issue on Masonry.

2007 ◽  
Vol 34 (11) ◽  
pp. 1403-1412 ◽  
Author(s):  
Miha Tomaževič
Keyword(s):  
Lateral Displacement ◽  
Reduction Factor ◽  
Shaking Table ◽  
Eurocode 8 ◽  
Masonry Buildings ◽  
Limit States ◽  
Masonry Construction ◽  
Displacement Capacity ◽  
Earthquake Resistant Design ◽  
Earthquake Resistant

The results of lateral resistance tests of masonry walls and shaking table tests of a number of models of masonry buildings of various structural configurations, built with various materials in different construction systems, have been analyzed to find a correlation between the occurrence of different grades of damage to structural elements, characteristic limit states, and lateral displacement capacity. On the basis of correlation between acceptable level of damage and displacement capacity, it has been shown that the range of elastic force reduction factor values used to determine the design seismic loads for different masonry construction systems proposed by the recently adopted European standard Eurocode 8 EN-1998-1 for earthquake resistant design are adequate. By using the recommended design values, satisfactory performance of the masonry buildings that have been analyzed may be expected when subjected to design intensity earthquakes with respect to both the no-collapse and damage-limitation requirements.

scholarly journals The building features acquired from the indigenous technology contributing in the better performance during earthquake: a case study of Bhaktapur City

2014 ◽  
Vol 2 ◽  
pp. 41-45 ◽  
Author(s):  
Dipendra Gautam
Keyword(s):  
Unreinforced Masonry ◽  
Building Construction ◽  
Masonry Buildings ◽  
Construction Technology ◽  
Engineering Construction ◽  
Masonry Construction ◽  
Earthquake Resistant Design ◽  
Earthquake Resistant ◽  
Historical Database

This paper compiles the indigenous technologies adopted in the Bhaktapur municipality, Nepal in the unreinforced masonry construction of traditional Newari houses constituting more than 90% buildings in Bhaktapur municipality and their significance during the earthquake. The building units adopted in this area are studied with respect to their performance during earthquake on the basis of seismic resistant design philosophy. The traditionally built non-engineered buildings have drawn the attention of disaster managers for many years; in this regard, the unreinforced masonry buildings (Newari houses) were assessed after the Sikkim-Nepal boarder earthquake of 2011.Still, the buildings constructed before the starting of engineering construction in Nepal are widely used for residential purpose at this culturally rich city and the traditional building construction technology which is the indigenous technology has been practiced for centuries too. The building features are analyzed with respect to their seismic performance and their contribution was analyzed as per the historical database; established practices and theories for earthquake resistant design (EQRD). The collected features and the analyses proved the features of the buildings to be sound during earthquake, though; the buildings were constructed with indigenous technology which nevertheless consults the EQRD within it. The indigenous technology at this city has been attached with the culture of the Newars for centuries.

Mechanical Analysis for the Assessment of the Seismic Capacity of Masonry Buildings’ Classes in the City Centre of Sulmona (Italy)

2010 ◽  
Vol 133-134 ◽  
pp. 623-628
Author(s):  
Marco Munari ◽  
Gianluca Busolo ◽  
Maria Rosa Valluzzi
Keyword(s):  
Mechanical Analysis ◽  
City Centre ◽  
Masonry Buildings ◽  
Seismic Capacity ◽  
Limit States ◽  
Damage Level ◽  
Capacity Curves ◽  
Perfectly Plastic ◽  
Displacement Capacity ◽  
Comparison Of The Results

A mechanical based method for the evaluation of the seismic capacity of masonry buildings’ classes in terms of damage limit states is presented: the purpose of the study is to achieve, in the framework of vulnerability analyses at territorial scale, reliable values for the damage level of vulnerability classes of masonry buildings, depending on the seismic input level. This approach is, in fact, designed as a “1st level” tool based on easily traceable information provided by expeditious surveys. Once identified a limited number of typological, physical and mechanical parameters that are necessary to define each vulnerability class, a significant number of simplified models of masonry buildings belonging to each class has been created. Non-linear static analysis of these models allowed the creation of bilinear elastic perfectly plastic capacity curves: the displacement capacity described by these curves is related with the actual displacement values required by seismic intensities associated to different return periods. It is so possible to identify, for different vulnerability classes and different seismic inputs, the loss of capacity in terms of damage level of each building. An application of the method to models representative of masonry buildings in the historical centre of Sulmona, in L’Aquila province, and a comparison of the results with others obtained with other methodologies of assessment are presented.

scholarly journals Site investigation of masonry buildings damaged during the 23 October and 9 November 2011 Van Earthquakes in Turkey

2013 ◽  
Vol 13 (3) ◽  
pp. 689-708 ◽  
Author(s):  
F. Piroglu ◽  
K. Ozakgul
Keyword(s):  
Site Investigation ◽  
Masonry Buildings ◽  
Design Codes ◽  
Confined Masonry ◽  
Earthquake Resistant Design ◽  
Richter Scale ◽  
Earthquake Resistant ◽  
Van Earthquakes ◽  
The City ◽  
Extensive Damage

Abstract. The purpose of this study is to scrutinize and interpret the damages to masonry buildings after a series of earthquakes that occurred in Van, which is an eastern city of Turkey, within 17 days in 2011, i.e., the first earthquake hit on 23 October having the magnitude 7.1, and the second on 9 November with the magnitude 5.6 on the Richter scale. These consecutive earthquakes and their aftershocks caused extensive damage and the collapse of buildings in the city of Van and its villages and especially its near town, namely Ercis. For the investigation of masonry buildings, Hacibekir district, which is one of the regions comprising the highest density of masonry buildings in the city of Van, was selected and the seismic performance of these buildings was observed, tested in the field, and interpreted according to the Turkish earthquake-resistant design codes. In this region, masonry buildings were classified as adobe, unreinforced and confined masonry buildings. As a result of this field study, it was observed that whereas the confined masonry buildings had usually shown good performance during the earthquakes, the adobe and the unreinforced masonry buildings were seriously damaged and some of them were partially collapsed.

CHARACTERIZATION OF ENERGY DISSIPATIVE CUSHIONS MADE OF Ni-Ti SHAPE MEMORY ALLOY

2021 ◽  
Author(s):  
Ahmet Güllü ◽  
Josiah Owusu Danquah ◽  
Savaş Dilibal
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Damping Ratio ◽  
Seismic Energy ◽  
Dissipated Energy ◽  
Residual Drift ◽  
Displacement Capacity ◽  
Earthquake Resistant Design ◽  
Earthquake Resistant ◽  
Metallic Dampers

Abstract Earthquake-resistant design of structures requires dissipating seismic energy by deformations of structural members or additional fuse elements. Owing to its easy-to-produce, plug-and-play, high equivalent damping ratio, and large displacement capacity characteristics, energy dissipative steel cushions were found to be an efficient candidate for this purpose. However, similar to other conventional metallic dampers, residual displacement after a strong shaking is the most notable drawback of the steel cushions. In this work, cushions produced from Ni-Ti shape memory alloy are evaluated numerically by experimentally verified finite element models to assess their impact on the performance of earthquake-resistant structures. Furthermore, a reinforced concrete testing frame is retrofitted with energy dissipative steel and Ni-Ti cushions. Performance of the frames (e.g. dissipated energy by the cushions, hysteretic energy to input energy ratio, maximum drift, and residual drift) with different types of cushions are evaluated by nonlinear response history analyses. The numerical results showed that the steel cushions are effective to reduce peak responses, while Ni-Ti cushions are more favorable to reduce residual drifts and deformations. Hence, a hybrid system, employing the steel and shape memory alloy cushions together, is proposed to reach optimal seismic performance.

Application of Direction Optimized-Friction Pendulum System to Seismic Mitigation of Sensitive Equipment

2007 ◽  
Author(s):  
C. S. Tsai ◽  
Wen-Shin Chen ◽  
T. C. Chiang ◽  
Yung-Chang Lin
Keyword(s):  
Seismic Energy ◽  
Shaking Table ◽  
High Tech ◽  
Radius Of Curvature ◽  
Pendulum System ◽  
Displacement Capacity ◽  
Base Isolator ◽  
Earthquake Resistant ◽  
Control Devices ◽  
Friction Pendulum

In the recent years, earthquake proof devices have been used to promote the earthquake resistant capabilities of many structures and public constructions. In addition, the high-tech industries are an important key to economic development in some earthquake prone areas, and many historical relics are also located in these areas. Therefore, how to protect the critical equipments from earthquake damage is an important issue. Among many control devices, sliding type isolators such as the FPS, MFPS and TFPS, ect. Isolators are used to lengthen the natural periods of equipment, and to isolate the seismic energy trying to impart to structures. However, the frequency and displacement capacity have been predefined when the radius of curvature of the concave surface or stiffness of base isolator is once determined. In this study, the base isolator with variable frequencies and displacement capacities has been proposed, and several shaking table tests of critical sensitive equipment with the proposed isolators have been carried out in Feng Chia University. The experimental results illustrated that the most responses of tested equipment have been reduced during earthquake.

scholarly journals RECOMMENDATIONS ON THE DEVELOPMENT OF PROBABILITY MAPS OF SEISMIC ZONING OF THE TERRITORY OF KAZAKHSTAN BASED ON MODERN METHODOLOGY

2020 ◽  
Vol 6 (444) ◽  
pp. 236-244
Author(s):  
D. K. Suleyev ◽  
◽  
N. B. Uzbekov ◽  
A. B. Sadykova, ◽  
N. V. Silacheva ◽  
...  
Keyword(s):  
Seismic Hazard ◽  
Hazard Assessment ◽  
Seismic Hazard Assessment ◽  
Seismic Intensity ◽  
Eurocode 8 ◽  
Seismic Zoning ◽  
New Approach ◽  
Earthquake Resistant Design ◽  
Earthquake Resistant ◽  
Scale Levels

Minimization of fatalities, material damage, and socio-economic destruction due to earthquakes depends on reliable estimates of seismic hazard. The paper presents the methodological foundations of seismic hazard assessment developed for Kazakhstan, the basic requirements and the list of work required to carry out seismic zoning of territories at different scale levels – general, detailed and microzoning. They were tested during the creation of Maps of General Seismic Zoning of the Territory of Kazakhstan, which were included in regulatory documents in 2017 and Maps of Seismic Microzoning of Almaty on a new methodological basis. A new approach to seismic hazard assessment is based on a methodology that complies with the main provisions of Eurocode 8 “Design of structures for earthquake resistance”, meets the needs of earthquake-resistant design and construction, is probabilistic and allows to assess seismic hazard not only in seismic intensity according to MSK-64(K) scale common for Kazakhstan, but also in quantitative parameters – peak ground accelerations. For each type of seismic zoning, general objectives are defined that can be solved with consideration of the scale of developed maps.

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