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Seismic Behavior Assessment of The Historical Tomb of Sheikh Shahab-edin Ahary Original Article, D58 Pouraminian M, Pourbakhshian S, Khodayari R. J. Civil Eng. Urban. 4(4): 382-389. 2014 ABSTRACT: This study aims to investigate failure mechanism of historical tomb of Shahab-edin Ahary elements and determines areas prone to structural failure. Since Ahar is one of the most earthquake-prone cities of Iran with relative risk of large earthquakes, the presence of multiple faults in this area as well as historical, cultural and tourism importance of the building, makes its vulnerability assessments and retrofitting inevitable. Because of low adhesion strength of masonry used in the building and regarding its vulnerability records on previous earthquakes, the building seems weak against relatively intense earthquakes. The aim of this study is to investigate vulnerability of this building against possible earthquakes. Selected earthquakes for seismic loading are modified for the maximum horizontal acceleration obtained for this region. Various results have been studied after utilize finite element model using Ansys software and various analyses. Keywords: Seismic Behavior, Historical Buildings, Dynamic Analysis, Sheikh Shahab-Edin Ahary, Macro Modeling. منبع: [Hidden Content] دانلود: [Hidden Content].,%204%20(4)%20382-389,%202014.pdf J. Civil Eng. Urban., 4 (4) 382-389, 2014.pdf

Study of Non-linear Dynamic Behavior of Structures with Steel Shear Wall under the Near Fault Earthquakes Original Article, C55 Soltani P. and Tabatabaei Mirhosseini R. Journal. Civil Eng. Urban. 3(6):372-379. 2013 ABSTRACT:This paper deals with study of the steel shear walls and dynamic analysis of such structures under the earthquakes near fault. The studied frames in this paper have a span in 4-meter width and 3-meter height and are included 3 spans. We studied the dynamic of frames after modeling the frames in ABAQUS and giving the earthquake acceleration records near Kobe, Lomaprieta, and Northridge. The results showed that the increase of number of storey increases maximum storey displacement of moment frames. The increase of thickness the shear wall also will decrease the displacement of maximum storey because of decreasing the non-linear effects of shear wall and the delay on submission. Therefore, Base shear in moment frames of 3, 6, and 12-storey, not only depends on maximum acceleration and acceleration records, but also depends on the form of acceleration records. By increasing the number of the storey, this efficacy will be decreased so that the maximum acceleration would be more effective on the storey shear increase or decrease. We can say, by increasing the number of storey of vibration mode, maximum acceleration of storey has the regular process in each 3 acceleration record. It seems that the acceleration of storey not only is based on the type of acceleration record but also is based on the other elements such as increasing the thickness of shear wall and number of the storey. Maximum response in the last storey would not that change by increasing the thickness of shear wall but in the response of other storey, has 6 storey especially storey 3, 4, and 5 in the frame. We can conclude that acceleration of the storey compared to acceleration of column has had the increasing process, by watching the response of acceleration record. The increase of shear wall also decreases the acceleration of storey. Keywords:Dynamic Analysis, Near Fault, Steel Shear Wall, ABAQUS Software, Base Shear منبع: [Hidden Content] دانلود: [Hidden Content].,55-372-379.pdf J. Civil Eng. Urban.,55-372-379.pdf

The Effect of soil-flexibility on seismic response of a typical Steel Plate Shear Wall subjected to Duzce Earthquake J. MIRLOHI*, P. MEMARZADEH*, F. BEHNAMFAR† Department of Civil Engineering, Najafabad Branch, Islamic Azad University, Najafabad Department of Civil Engineering, Isfahan University of Technology, Isfahan IRAN p-memar@iaun.ac.ir Abstract: - Steel Plate Shear Wall is commonly employed as a principal system to resist lateral loads due to wind or earthquake forces. An accurate model for SPSW needs to consider the effect of all components for analysis such as foundation and subsoil. One of most important aspects of structural analysis is soil-structure interaction (SSI). Such interaction may alter the dynamic characteristics of structures and consequently may be beneficial or detrimental to the performance of structures. This investigation is aimed to evaluate the effect of soil-structure interaction on seismic response of a typical multi-story SPSW designed according to AISC requirements. In this procedure, a time-direct method is used in which the unbounded soil is modeled by couple finite-infinite elements. To investigate the effects of SSI the following types of analysis are performed: in the first type, the structure is analyzed without subsoil (fixed base) and in the second type, analysis is carried out for the same structure with consideration of soil-structure interaction (flexible-base). Finally, the results of analysis with and without SSI effects are compared. Key-Words: - Steel Plate Shear Wall, Soil Structure Interaction, seismic response, dynamic analysis [Hidden Content] GEMESED-72.pdf

Seismic response of steel plate shear walls considering soil-structure interaction P. Memarzadeh, J. Mirlohi and F. Behnamfar Abstract—Due to structural efficiency, Steel Plate Shear Wall (SPSW) is widely employed in buildings as a principal system for resisting lateral loads due to wind and earthquakes. An accurate model of seismic demand for SPSW requires consideration the effect of all components for analysis such as structural, foundation, subsoil elements and the interaction between them. Such interaction may alter the dynamic characteristics of structures and consequently may be beneficial or detrimental to the performance of structures. This investigation considers two typical SPSW designed according to AISC requirements. The effects of soil-flexibility on seismic demands of such frames resting on two soil types subjected to two different earthquake ground motion is investigated using the time direct method and a comparison is presented with the results obtained from fixed-base. It is observed that soil–structure interaction affect the seismic performance of SPSW and the effect of soil-flexibility must be taken into account in dynamic analyses of SPSW. Keywords—Steel Plate Shear Wall, Soil Structure Interaction, seismic response, dynamic analysis [Hidden Content] ENGCO-18.pdf

Conceptual Discussion on Free Vibration Analysis of Tension Leg Platforms Mohammad Reza Tabeshpour Center of Excellence in Hydrodynamics and Dynamics of Marine Vehicles, Mechanical Engineering Department, Sharif University of Technology, Tehran, Iran tabeshpour@sharif.edu Abstract Tension leg platforms are used for oil exploitation in deep water. The accurate and reliable responses are needed for optimum design and control of the structure. Free vibration analysis gives us a deep view of structural response and the judgment on coupling effects between degrees of freedom. In this paper the nonlinear dynamic analysis of TLP is carried out. The power spectral densities (PSDs) of responses are calculated from nonlinear responses. A computer program has been developed capable of solving differential equation of motion of TLP under various types of excitations. The focus of the paper is on the conceptual discussion of the structural behavior and responses of the structure related to initial arbitrary conditions. As an example a case study is investigated and numerical results are discussed. Keywords TLP; Free Vibration; Dynamic Analysis Conceptual Discussion on Free Vibration Analysis of Tension Leg Platforms Tabeshpour_Conceptual-Discussion_2013.pdf