بررسی رفتار چرخه ای دیوار برشی فولادی مجهز به میراگرهای افزاینده میرایی وسختی

در مطالعه حاضر رفتار چرخه ای دیوار برشی فولادی یک قاب فولادی سه طبقه مجهز به میراگرهای افزاینده میرایی و سختی (adas) مورد بررسی قرار گرفت. در این مطالعه با هدف بررسی و بهبود عملکرد سیستم دیوار برشی فولادی در برابر نیروهای جانبی، میراگرهای پیشنهادی در فاصله مابین ستون ها و ورق های پرکننده دیوار برشی فولادی نصب شدند. پارامترهای مورد بررسی به ترتیب شامل ضخامت ورق میراگر (8، 10، 12، 14 و 16 میلی متر) و ضخامت ورق پرکننده (3، 4، 5 و 6 میلی متر) می باشد. ارزیابی رفتار چرخه ای دیوار برشی فولادی با استفاده از روش اجزاء محدود و توسط نرم افزار abaqus انجام و پروتکل بارگذاری بر اساس atc-24 اعمال گردید. به منظور راستی آزمایی، نمونه آزمایشگاهی توسط نرم افزار abaqus شبیه سازی و ملاحظه گردید نمونه آزمایشگاهی و مدل اجزاء محدود تطابق مناسبی دارند و می توان از مدل اجزاء محدود جهت بررسی و مقایسه پارامترهای موردنظر در این مطالعه نظیر استهلاک انرژی، مقاومت، سختی و شکل پذیری استفاده نمود. نتایج حاصل حاکی از افزایش استهلاک انرژی، مقاومت، سختی و شکل پذیری در مقایسه با مدل بدون میراگر بود . در ادامه با بررسی منحنی های هیسترزیس و نسبت میرانیی هیسترزیس مدل های مختلف ، برتری چشمگیری مدل های مجهز به میراگر نسبت به مدل بدون میراگر مشهود بود در انتها، عملکرد میراگرهای پیشنهادی به همراه سازوکار خرابی میراگرها مورد بررسی قرار گرفت. نتایج حاصل نشان داد میراگرهای adas با تغییرشکل های خاص خود، باعث افزایش قابل توجه استهلاک انرژی و شکل پذیرتر شدن دیوار برشی فولادی شده و با جذب مقدار زیاد انرژی، باعث کاهش نیروی وارد شده به اجزاء اصلی و مانع از تخریب سیستم دیوار برشی فولادی می شود.

evaluation of cyclic behavior of steel plate shear wall equipped with added damping and stiffness (adas) dampers

in the present study, the cyclic behavior of steel plate shear wall of a three-story steel frame equipped with added damping and stiffness (adas) dampers was evaluated. in this study, with the aim of investigating and improving the performance of the steel plate shear wall against lateral forces, the proposed dampers were applied in the distance between the columns and the steel plate shear wall infill plates. the parameters studied include the thickness of the damper sheet (8, 10, 12, 14 and 16 mm) and the thickness of the infill plate (3, 4, 5 and 6 mm) respectively. evaluation of cyclic behavior of steel plate shear wall was performed using finite element method via abaqus software and the loading protocol based on atc-24 was applied. in order to verify, the experimental specimen was simulated by abaqus software and it was observed that the experimental specimen and the finite element model are in good conformation and the finite element model can be applied to study and compare the parameters considered in this study such as energy dissipation, strength, stiffness and ductility. the results showed that as the thickness of the damper sheet increased, the energy consumption in the steel plate shear wall system increased from 12 to 66 percent compared to the model without dampers. also, by reducing and increasing the thickness of the infill plates in the second and third floors compared to the model without dampers, we saw an increase in energy consumption from 52 to 64 percent compared to the model without dampers, which indicates the good performance of the dampers. the strength of the steel plate shear wall system increased from 2.40 to 3.14 times by considering different thicknesses for the damper compared to the model without damper, and further by considering the infill plates for the steel plate shear wall system. we saw an increase in strength from 2.30 to 2.81 times compare to the model without damper. the stiffness level of each steel plate shear wall model was investigated and compared, and we saw an increase in stiffness from 76 to 99 percent compared to the model without damper. also, considering the thickness of different infill plates for the steel plate shear wall system, the stiffness increased from 82 to 98 percent compared to the model without damper. as the thickness of the damper sheets increased, the ductility increased from 2.32 to 2.55 times compare to the model without damper. also, considering the thickness of different infill plates for the steel plate shear wall system, we saw an increase in strength from 2.29 to 2.55 times compare to the model without damper. further, by examining the hysteresis curves and the hysteresis damping ratio of different models, it was evident that the models equipped with dampers are significantly superior to the models without dampers, and as the thickness of the dampers increased, the area under the curve of each model increased. as a result, the larger this level is, it indicates that the member is more malleable and has the ability to absorb more energy. finally, the performance of the proposed dampers was investigated along with the damper failure mechanism. the results showed that adas dampers with their special deformations, significantly increase energy consumption and make the steel plate shear wall more malleable and by absorbing a large amount of energy they reduced the force applied to the main components and prevented the destruction of the steel plate shear wall.