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۱EFFECT OF THE GIRDER–SUPPORTED STEEL PLATE ON STIFFENED AND UNSTIFFENED SPSWs SEISMIC BEHAVIOR
نویسنده(ها): ، ،
اطلاعات انتشار: چهارمین کنفرانس بین المللی مقاوم سازی، سال
تعداد صفحات: ۱۰
Steel Plate Shear Wall (SPSW) has been known as one of the effective lateral resisting systems in the steel structures. The classic types of SPSW consist of plate and stiffeners which connected to the surrounding frame, while using its unstiffened type is more common due to its economical aspects. Optimized usage of strength capacity, high ductility and energy dissipation in steel plate during the post buckling phase make the SPSW as an effective type. The separation of steel plate from columns is a useful idea developed in order to reduce column's and foundation's lateral transferred overturning moments; however it may increase the ductility versus the shear strength.This paper discussed an investigation trend on the stiffened and unstiffened girder–supported panels subjected to monotonic in–plan shear and to understand and to avoid plate's edges tearing, the use of two vertical stiffeners at the ends of plate has been investigated.Finite element method for mathematical modeling to use the pushover method has been the main mechanism for simulation the behavior.The most important parameters such as: Frame aspect ratio, plate width to thickness ratio, covering plate area and the dimension of stiffeners in these systems has been investigated.As conclusion, behavior of these types of SPSW were comprised with the classic type to find and publish the different aspects, and therefore, appropriate behavior of this system has been studied, specially for rehabilitation and retrofitting the existing buildings and damaged structures<\div>

۲A Comparison of different Non–linear Numerical Models for Pier Shaft interaction analysis for study of the seismic performance of Bridges
نویسنده(ها): ، ،
اطلاعات انتشار: کنفرانس بین المللی عمران، معماری و توسعه پایدار شهری، سال
تعداد صفحات: ۱۵
The AASHTO code of practice for design of bridges shows that the ductility level for foundation is given equal to one. Bridges are classified in three classes of bridges. For class of essential and normal bridges a question for not to use ductility level due to the importance of bridges’ costs is become an important item in different countries particularly in Middle east.this paper aimed to study on performance of bridges based on the effect of soil non–linear behavior. A comparison between Finite Difference (F.D), Finite Element (F.E) methods and close form solutions has been carried out on single and group piles under lateral loads in multilayered soils. Winkler model with non–linear springs, FLAC–3D, ANSYS5.4 and ABAQUS software were used for verifications. the Lagrangian method was considered in FLAC–3D and the Drucker–Prager was used in ANSYS. Pile behavior in sandy soils, uniform clayey soils, clayey deposits including sandy lenses, and Sand deposits with thin clay layers were analyzed. Verification between traditional close form solution methods with those analysis methods were carried out.Results show the effectiveness of foundation ductility in compare with the expected ductility levels and structural performance for superstructure. The ductility level of substructure due to the pile soil interaction has found equal to 3.5 to 4.5 for different soil types. It show in Pile and Deck (pier shaft) model in bridges for the normal and essential bridges classes the use of ductility should be taken into account in accordance with soil–structure performance.In conclusion the paper shows that for the pier shaft system it would be possible to use ductility level for foundations for normal and essential class of bridges and for those countries that they use the structural ductility for design of all components of structure including piles, the level of performance should be precisely investigated and using of structural ductility level is under question for design of pier shaft models<\div>
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