ارتقاء عملکرد لرزه‌ای ناحیه اتصال تیر به ستون در ساختمان‌های تیر فولادی- ستون بتنی با استفاده از کامپوزیت‌های سیمانی مهندسی شده

نوع مقاله : Articles

نویسندگان

1 گروه مهندسی عمران، دانشکده مهندسی عمران و نقشه‌برداری، واحد قزوین، دانشگاه آزاد اسلامی، قزوین، ایران

2 پژوهشکده مهندسی سازه، پژوهشگاه بین المللی زلزله‌شناسی و مهندسی زلزله، تهران، ایران

3 گروه مهندسی عمران، دانشکده مهندسی ، دانشگاه خلیج فارس بوشهر، بوشهر، ایران

چکیده

در سال‌های اخیر استفاده از قاب‌های خمشی مرکب متشکل از ستون‌های بتنی و تیر‌های فولادی (RCS) مورد توجه زیادی قرار گرفته است. این سیستم با ترکیب بهینه عناصر سازه‌ای فولادی و بتنی از محاسن هر دو سیستم بهره می‌برد. در این نوع سازه‌ها شناخت رفتار ناحیه اتصال تیر به ستون و مکانیسم شکست در اتصالات اهمیت عمده‌ای دارد. جایگزین نمودن بتن ستون در این اتصالات با بتنی توانمند و انعطاف‌پذیر همچون بتن مهندسی شده (ECC) قادر است عملکرد لرزه‌ای این نوع از سازه‌ها را بهبود دهد. در این تحقیق دو نمونه از این اتصالات با تیر میان‌گذر، در نرم‌افزار المان محدود ABAQUS مدل‌سازی و با نمونه آزمایشگاهی موجود صحت‌سنجی شد. رفتار غیر‌خطی هشت مدل از اتصالات تیر فولادی، ستون بتنی با استفاده از بارگذاری استاتیکی مورد بررسی قرار گرفت. نتایج نشان دادند که عملکرد این اتصالات با محصورشدگی بتن ناحیه اتصال رابطه مستقیم دارد. در ادامه جهت تسهیل جزئیات اتصال و ارتقاء رفتار آن، بتن ECC در دو حالت متفاوت، در گره اتصال و کل ستون، جایگزین بتن معمولی در اتصالات گردید. در پایان پس از مقایسه نتایج عملکرد این نوع از اتصالات، یک مدل پیشنهادی اولیه با بتن ECC ارائه شد که علاوه بر افزایش ظرفیت این اتصالات، رفتار بسیار پایدارتر و مطلوب‌تری از خود نشان می‌دهد.

کلیدواژه‌ها


عنوان مقاله [English]

Improving Seismic Performance of Steel Beam-Concrete Column Joint Using Engineered Cementations Composites (ECC)

نویسندگان [English]

  • Aryan Javadi Zonouzi 1
  • Fariborz Nateghi-A 2
  • Ayoub Dehghani 3
1 Department of Civil Engineering, Faculty of Architceture and Civil Engineering, Islamic Azad University, Qazvin, Iran
2 Structural Engineering Research Center, International Institute of Earthquake Engineering and Seismology (IIEES), Tehran, Iran
3 Department of Civil Engineering, Faculty of Engineering, Persian Gulf University, Bushehr, Iran
چکیده [English]

Within the past few decades, researchers and designers have become more interested in utilizing the hybrid structures consisting of the reinforced concrete and steel members. This combined system benefits its own advantages from both steel and concrete characteristics. One of these systems is the RCS; Reinforced Concrete Column Steel beam. A moment frame consists of Reinforced Concrete columns (RC) and Steel beams (S).

In this research, two samples of this type of connection whose experimental models were established by Alizadeh et al. (2000) were used. Both specimens were tested under quasi-static reversed cyclic loading and simulated using a nonlinear three-dimensional finite element method analyzed by the ABAQUS software. After verifying the FEM models, some special joint details were simulated for investigating the effect and the performance of the steel band plates, FBPs, EBPs, WFBPs, ABPs , steel doubler plates and the stirrups in joint. Lateral load story drift response, the cracking pattern of the joints, shear strains at the joints, non-linearization of steel beam were studied in the considered models. The results indicated that the performance of the models depended directly on the joint detailings, the effectiveness of the shear keys, and the amount of the confinement provided for the panel zone region.

Engineered cementitious composites (ECC) are a class of high-performance fiber reinforced cement composite with strain hardening and multiple cracking properties. Therefore, replacing the connection column with strong and flexible concrete, such as engineered concrete, increases the seismic behavior of this type of connections. Therefore, composite concrete was replaced by the column concrete in the modeled joints for further investigations.

The comparative results indicated that the application of the ECC in columns, beam-column joints, in parts or as a whole, in composite systems can greatly improve their seismic behavior. In addition, the use of ECC, allowed the reduction and even the elimination of the steel transverse reinforcements in the connection. This indeed simplifies the joint detailing, especially when the beams are framing into the same column from different directions.

Finally, a model of RCS connection with ECC is presented, which in addition to simpler detailing scheme in the joint area, has also a favorable seismic behavior.

کلیدواژه‌ها [English]

  • RCS Connection
  • Through Beam
  • finite element method
  • ECC
  • Seismic Behavior
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