توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱assessment of behavior of moment – resistant reinforced concrete buildings subjected to surface blast loads
نویسنده(ها): ،
اطلاعات انتشار: نهمین کنگره بین المللی مهندسی عمران، سال
تعداد صفحات: ۸
In this study behavior of twO reinforced concrete buildings which have been designed in accordance to national building codes have been evaluated to surface blast loading the two buildings are modeled in 3D dimension in abaqus explicit software. The buildings under investigation include 4–storey and 8–storey moment resistant frames these two buildings are analyzed under surface blast loading and seismic loading then structural responses such as base shear and base moment are compared with each other.base on the responses it is concluded that blast has muchhigher effects than earthquake on the builings although time period of blast is much less than of earthquake.<\div>

۲Modal characteristics of integral bridges including the effect of soil–structure interaction
نویسنده(ها): ،
اطلاعات انتشار: دهمین کنگره بین المللی مهندسی عمران، سال
تعداد صفحات: ۸
A numerical study is conducted in this paper to investigate the effect of soil–structure interaction on modal characteristics of an integral bridge. The study includes four different interaction scenarios applied to a four–span integral reinforced concrete bridge. These scenarios are selected such that they capture common boundary conditions of pile foundations supported on sandy soil. A three dimensional fiberbased distributed plasticity finite element analysis is carried out in OpenSees to assess the dynamic response and modal properties of the bridge. Numerical results indicate that modal characteristics of the bridge can be significantly affected in different interaction scenarios. Besides, the effect of higher modes may vary in different soil–structure interaction scenarios. As the stiffness of the foundation and soil increases, the contribution of higher modes in the behavior of the bridge increases. Therefore, the effect of soil–structure interaction should be carefully modeled and included in the seismic assessment of integral bridges in order to achieve realistic and accurate seismic evaluation for engineering applications.<\div>

۳Seismic Analysis of Wind Turbines Including Soil–Structure Interaction
نویسنده(ها): ،
اطلاعات انتشار: دهمین کنگره بین المللی مهندسی عمران، سال
تعداد صفحات: ۷
This paper investigates the seismic behavior of wind turbines including soil–structure interaction (SSI). Because of high risk of earthquake in Iran and the effects of soil condition in seismic analysis, one of the most important issues in design of wind turbines is seismic analysis of these structures including SSI. In this study a model for seismic analysis of wind turbines including SSI is introduced. SSI can be considered byrigorous or approximate methods Rigorous methods require considerable amount of expertise in idealizing the dynamic system and significant data preparation and interpretation of the results and also are not economical. Instead the approximate methods can save time and expenses by representing a more practical model for SSI, although these procedures have approximations that cause deviations smaller than the typical engineering accuracy. For the present study SSI effects is considered using Cone Models that is an approximate procedure. Wind turbine is modeled in FE based program OpenSees with beam–column elements. Results show that SSI can affect the responses and should be considered in seismic analysis of wind turbines to have more trustworthy outputs.<\div>

۴Dynamic Behavior of Lattice Transmission Towers
نویسنده(ها): ،
اطلاعات انتشار: دهمین کنگره بین المللی مهندسی عمران، سال
تعداد صفحات: ۸
Transmission towers as kind of complex structures are comprehensively used in power transmission lines. Regarding the exposure of transmission towers to the wind and storm, the dynamic investigation of these structures is important. In this research, the dynamic behavior of a lattice transmission tower, including nonlinear effects i.e., geometric, material and joint slippage, is studied. For this reason, the lattice transmission tower is firstly pre–analyzed due to the weight load, incorporating nonlinear parameters in different cases, and then, the frequency analysis is performed and the natural frequencies of the lattice transmission tower are obtained. Afterwards, these natural frequencies are compared for different cases and it is observed that in contrast to the geometric and material nonlinearities which are not effective on the natural frequencies of the structure, incorporating the joint slippage can substantially decrease the natural frequencies. These natural frequencies are significant in the dynamic analysis of these structures either individually or as coupled system along with conductors. Finally, the first five mode shapes of the tower are presented<\div>

۵A boundary element method for the Laplace equation in a circular domain
اطلاعات انتشار: دهمین کنگره بین المللی مهندسی عمران، سال
تعداد صفحات: ۹
Laplace equation governs many types of engineering problems such as torsion, heat conduction, pressure distribution in pipes, seepage and aquifer analysis. Therefore, finding a solution for this equation is of crucial importance. In this article, a boundary element solution for the Laplace equation in a circular domain is presented. Two types of elements including constant elements and linear elements are employed in order to carry out the discretization process. The formulations are given in detail. The corresponding fundamental solution is obtained in a closed–form manner. Numerical results studied in the paper indicate the accuracy of the proposed solution. Furthermore, the obtained numerical results are compared with the exact values which an excellent agreement is observed.<\div>
نمایش نتایج ۱ تا ۵ از میان ۵ نتیجه