Upgrading of bolted top-seat angle connections performance Adding double web angles

سال انتشار: 1387
محل انتشار: سومین کنفرانس ملی و اولین کنفرانس بین المللی مقاوم سازی
کد COI اختصاصی: INRC03_286
زبان مقاله: انگلیسی
تعداد مشاهده: 2220

نویسندگان

Naghsh Afarin Mehraz Consulting Engineers, Tehran, Iran

چکیده

In this paper, a parametric study was conducted to investigate the moment-rotation behavior of top and seat angle connections using nonlinear finite element (FE) method. Based on the experiments carried out by preceding researchers, several refined FE models were created in which the geometrical and mechanical properties of connections were as parameters. Eight node solid elements were used to model all of the connection components such as beam, column, angles and bolts. The effect of interactions, such as slippage of bolts and frictional forces, were modeled using surface contact algorithm. To evaluate the connection behavior more precisely, pre-tensioning forces were also applied on bolt shanks as the first load case. Comparing the results of numerical modeling and test results, good agreement was observed, especially in linear range of moment-rotation curves. To study the efficiency of the adding double web angles to enhance the rotational stiffness and moment capacity of bolted top-seat angle connections, models were created with different size and properties and the effect of each parameter on connection behavior was studied. Then the study was extended by evaluating the role of the web angles on seismic performance of a selected semi-rigid frame. The frame was modeled using bar elements and relative stiffness of connections was considered and modeled using zero length joint elements. The result of nonlinear time-history analysis showed that adding web angles to frame connections will reduce the story drift and increase the energy absorbance capacity of the structure.

کلیدواژه ها

Bolted angle connection; Finite element modeling; semi-rigid frame; dynamic analyses

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.