Pouya Akbari; Vahid Saberi; Hamid Saberi; Faezeh Eslami; Abbasali Sadeghi
Volume 2, Issue 9 , December 2021, , Pages 11-21
Abstract
One of the most important and fundamental issues that civil engineers always deal with today due to its importance is the study of the performance and behavior of structures under different conditions. In addition, in many cases, buildings are analyzed and designed separately and without considering ...
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One of the most important and fundamental issues that civil engineers always deal with today due to its importance is the study of the performance and behavior of structures under different conditions. In addition, in many cases, buildings are analyzed and designed separately and without considering the effect of other elements, including the foundation and soil of the infrastructure, which in many cases creates irreparable risks; Therefore, it is necessary to study and evaluate the effect of soil-structure interaction on the performance and design of buildings in order to manage the cost and time of construction projects. In this study, the performance of steel structures with concentric brace of 5, 10 and 15 floors by considering the interaction of soil structure in three different soil modes using nonlinear dynamic analysis of time history under 3 near-fault earthquakes has been done. The results show that considering the interaction of soil and structure increases the accuracy of structural responses.
Vahid Saberi; Hamid Saberi; Faezeh Eslami; Abbasali Sadeghi
Volume 2, Issue 8 , November 2020, , Pages 38-54
Abstract
In this study, the effect of steel damper with vertical slits on chevron braced frames with the number of different stories is investigated and pushover and cyclic analyses are performed . To evaluate and compare the results, a parametric study is carried out on a steel damper with and without slit. ...
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In this study, the effect of steel damper with vertical slits on chevron braced frames with the number of different stories is investigated and pushover and cyclic analyses are performed . To evaluate and compare the results, a parametric study is carried out on a steel damper with and without slit. Eight model frames such as a single-story in ordinary moment frame, braced frame, chevron braced frame with gusset plate, chevron braced frame equipped by a damper with vertical slits, chevron braced frame with silt damper and three-story chevron braced frame equipped by a damper with vertical slits, five-story chevron braced frame equipped by a damper with vertical slits, eight-story chevron braced frame equipped by damper with vertical slits are modeled and analyzed by finite element method in Abaqus software. The results showed that the braced frame equipped by a damper with vertical slits by its ductile behavior, dissipated a large amount of earthquake input energy and reduced the base shear. The hysteresis curves were stable and without any loss, indicating high energy absorption by chevron braced frame equipped by a damper with vertical slits. In all the chevron braced frame equipped by a damper with vertical slits, the plastic hinges are not formed in the members of structures, and the failure mechanism is concentrated in the damper. The damper with vertical slits reduced the elastic stiffness, secondary stiffness and carrying capacity, which in addition to controlling the drift of the structure, increased the energy absorption capability. The chevron braced frame equipped by a damper with vertical slits had more ductility than other specimens, and according to the results, damper with vertical slits had good seismic performance.
Vahid Saberi; Hamid Saberi; Pouya Akbari; Faezeh Eslami; Abbasali Sadeghi
Volume 2, Issue 8 , November 2020, , Pages 55-71
Abstract
In construction of high-rise buildings, one of the major and effective factors is the final cost of structure. Due to high volume of materials in such sort of projects, the smallest changes in the type and method of joining between the different structural components of these systems may have substantial ...
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In construction of high-rise buildings, one of the major and effective factors is the final cost of structure. Due to high volume of materials in such sort of projects, the smallest changes in the type and method of joining between the different structural components of these systems may have substantial impact on the amount of consumed materials and hence the final cost of the project. Structural systems applied in construction of high-rise buildings must be able to transfer the lateral wind force into the earth. One the systems used in construction of high buildings is outrigger system and truss belt. Optimized location of truss belt and shape of architectural plan have crucial effect on structural performance of the system. The aim of this study is to find the appropriate shape for building plan. In this regard, rectangular shaped plans with different width-to-length ratios, similar areas and different number of caps along the height of the building were constructed. After modeling and sample analysis, different parameters such as shear moment, lateral displacement, base shear, relative lateral displacement and …, were compared. Comparison of curves and analysis of obtained results showed that application of rectangular plan with width-to-length ration of 0.64 has better structural performance efficiency. Also, when lateral wind force is applied, application of truss belt resulted in creation of an inflection point in axial force curve of the columns surrounding the central core in the interval between two belts.
Faezeh Eslami; Abbasali Sadeghi
Volume 2, Issue 7 , October 2020, , Pages 82-96
Abstract
Every topic of architectural criticism is a branch of theoretical issues of architecture that is as a behavior and not just judgment and is an important part of the theoretical foundations of architecture, so that any change in various fields of design, based on architectural criticism. It is dependent ...
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Every topic of architectural criticism is a branch of theoretical issues of architecture that is as a behavior and not just judgment and is an important part of the theoretical foundations of architecture, so that any change in various fields of design, based on architectural criticism. It is dependent and criticism has a serious and undeniable presence in our architectural life. Architectural competitions are one of the emerging points of design criticism. These competitions often lead to detailed and heated debates about how to judge and referee works, which indicates the serious presence of criticism. The results and judging of these architectural competitions will orient the society. In this study, the effect of architectural competitions on the culture and formation of architecture in the country has been studied. In this paper, the content analysis method is used. The data are taken from articles published in specialized journals and these works are considered as informed. It is recommended to modify the flow of design competitions, modify the structure at different levels, and determine the accuracy of the objectives of the regulations and their exact implementation.
Kourosh Mehdizadeh; Faezeh Eslami; Seyede Vahide Hashemi; Abbasali Sadeghi; Gholamreza Shobeyri
Volume 2, Issue 7 , October 2020, , Pages 97-117
Abstract
In recent years, the discussion of nonlinear behavior in seismic evaluation of structures has been raised. One of the best and newest methods of evaluating buildings is the use of nonlinear dynamic analysis. This type of analysis shows a comprehensive behavior of structures in the linear to nonlinear ...
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In recent years, the discussion of nonlinear behavior in seismic evaluation of structures has been raised. One of the best and newest methods of evaluating buildings is the use of nonlinear dynamic analysis. This type of analysis shows a comprehensive behavior of structures in the linear to nonlinear domain. In this study, in addition to nonlinear dynamic analysis, in order to match the reality, seismic components with different angles have been applied to the structure to show a more accurate seismic evaluation of the structure. In this research, steel buildings with intermediate moment-resisting frame was modelled in three dimensional state in SAP2000 software with 8 and 12 stories and square and rectangular planes and their seismic performances have been studied and compared according to the angle of 8 pairs of accelograms (16 accelograms) under near and far-fault earthquakes (0, 30, 60 and 90 degree) using nonlinear dynamic time history analysis. The results showed that the performance of the structures at angles of 60 and 90 degree was more critical due to the larger seismic responses. Also, in most accelograms, the height of the structure was more effective than the plan shape on seismic responses. In addition, the studied structures had more critical seismic responses due to near-fault earthquakes compared to far-fault earthquakes.
