Ol,Distribution of internal forces in steel moment frames in the near-fault region

  • سال انتشار: 1394
  • محل انتشار: سومین کنگره بین المللی عمران ، معماری و توسعه شهری
  • کد COI اختصاصی: ICSAU03_0709
  • زبان مقاله: انگلیسی
  • تعداد مشاهده: 868
دانلود فایل این مقاله

نویسندگان

Afram Keivani

Professor of Department of Civil Engineering, Tabriz Branch, Islamic Azad University, Tabriz, Iran.

Mehdi Azizi

MSc of Civil Engineering, Tabriz Branch, Islamic Azad University, Tabriz, Iran.

Hale Dasti

BSc of Civil Engineering, Tabriz Branch, Islamic Azad University, Tabriz, Iran.

چکیده

Moment resistant steel frame is one of the structural systems used to resist earthquake loads in buildings. Many existing steel structures with this system need retrofitting to overcome deficiencies and to resist seismic loads. In the present study, the seismic behavior of rigid frames with knee-type braces was investigated and the distribution of internal forces in frame elements such as beams and columns were discussed. Two types of structures, including moment frames and braced frames with knee-type braces in different positions of joints, for 11, 21 and 31 stories were designed per the Iranian Seismic Code, the Iranian Steel Structures Design Code and the Seismic Provisions. Dynamic analysis using 8 earthquake records for moment frames and braced frames were carried out to obtain dynamic responses. According to the analysis results, the distribution of internal forces such as bending moments, shear forces and axial loads for braced frames in beams and columns turned out to be different from moment frames. Comparing shear and moment diagrams in moment frames and braced frames showed that utilizing knee-type braces cause the moments and shear forces at fixed ends to decrease. It means that the joint forces in braced frames are dissipated by a group of elements that are restricted by knee elements which change the joint from a point joint to a zonal joint.

کلیدواژه ها

steel moment frames, knee braces, near-fault region, seismic design

مقالات مرتبط جدید

اطلاعات بیشتر در مورد COI

COI مخفف عبارت CIVILICA Object Identifier به معنی شناسه سیویلیکا برای اسناد است. COI کدی است که مطابق محل انتشار، به مقالات کنفرانسها و ژورنالهای داخل کشور به هنگام نمایه سازی بر روی پایگاه استنادی سیویلیکا اختصاص می یابد.

کد COI به مفهوم کد ملی اسناد نمایه شده در سیویلیکا است و کدی یکتا و ثابت است و به همین دلیل همواره قابلیت استناد و پیگیری دارد.