Effects of detailing on panel zone seismic behaviour in special moment resisting frames with unequal beam depths

2012 ◽  
Vol 39 (4) ◽  
pp. 388-401 ◽  
Author(s):  
Roohollah Ahmady Jazany ◽  
Behrokh Hosseini Hashemi
Keyword(s):  
Analytical Study ◽  
Correct Selection ◽  
Engineering Practice ◽  
Seismic Behaviour ◽  
Moment Resisting Frames ◽  
Panel Zone ◽  
Moment Resisting ◽  
Continuity Plates ◽  
Special Case ◽  
Selection Of

Special moment resisting frames (SMRF) are commonly used as lateral-load resisting systems in seismic design. The results of recent studies have shown that the seismic performance of such frames can be improved by paying particular attention to the detailing of their panel zones (PZ) and beams. Panel zones with unequal beam depths appear to be a special case of connection detailing, which has not received sufficient attention so far and could lead to complications in everyday engineering practice. Some full-scale experiments of connections with unequal beam depths were performed, using different continuity plate arrangements (inclined and straight plates), and different corner clip lengths. A companion analytical study was also conducted, for which results have shown that the correct selection of inclined or straight continuity plates, with special detailing of the PZ, could keep the behaviour of the latter within safe margins. Such considerations could prevent the occurrence of failure in the PZ, and significantly improve the seismic resistance of SMRF with unequal beam depths.

The seismic behaviour of steel moment-resisting frames with stiffening braces

1998 ◽  
Vol 20 (12) ◽  
pp. 1045-1062 ◽  
Author(s):  
Luca Martinelli ◽  
Maria Gabriella Mulas ◽  
Federico Perotti
Keyword(s):  
Seismic Behaviour ◽  
Steel Moment Resisting Frames ◽  
Moment Resisting Frames ◽  
Moment Resisting

Analytical Study of Moment-Resisting Frames Retrofitted with Shear Slotted Bolted Connection

2015 ◽  
Vol 141 (11) ◽  
pp. 04015019 ◽  
Author(s):  
Mohammad Taghi Nikoukalam ◽  
Seyed Rasoul Mirghaderi ◽  
Kiarash M. Dolatshahi
Keyword(s):  
Analytical Study ◽  
Bolted Connection ◽  
Moment Resisting Frames ◽  
Moment Resisting

scholarly journals Strengthening of the Panel Zone in Steel Moment Resisting Frames

2019 ◽  
Author(s):  
Masoud Abedini ◽  
Sudharshan N. Raman ◽  
Azrul A. Mutalib ◽  
Ebrahim Akhlaghi
Keyword(s):  
Structural Engineering ◽  
Steel Structures ◽  
Inelastic Behavior ◽  
Linear Deformation ◽  
Rigid Zone ◽  
Steel Moment Resisting Frames ◽  
Moment Resisting Frames ◽  
Panel Zone ◽  
Standard Design ◽  
Moment Resisting

Rehabilitation and retrofitting of structures designed in accordance to standard design codes is an essential practice in structural engineering and design. For steel structures, one of the challenges is to strengthen the panel zone as well as its analysis in moment-resisting frames. In this research, investigations were undertaken to analyze the influence of the panel zone in the response of structural frames through a computational approach using ETABS software. Moment-resisting frames of six stories were studied in supposition of real panel zone, different values of rigid zone factor, different thickness of double plates, and both double plates and rigid zone factor together. The frames were analyzed, designed and validated in accordance to Iranian steel building code. The results of drift values for six stories building models were plotted. After verifying and comparing the results, the findings showed that the rigidity lead to reduction in drifts of frames and also as a result, lower rigidity will be used for high rise building and higher rigidity will be used for low rise building. In frames with story drifts more than the permitted rate, where the frames are considered as the weaker panel zone area, the story drifts can be limited by strengthening the panel zone with double plates. It should be noted that higher thickness of double plates and higher rigidity of panel zone will result in enhancement of the non-linear deformation rates in beam elements. The resulting deformations of the panel zone due to this modification can have significant influence on the elastic and inelastic behavior of the frames.

scholarly journals Seismic Upgrading of Steel Moment-Resisting Frames by Means of Friction Devices

2014 ◽  
Vol 8 (1) ◽  
pp. 289-299 ◽  
Author(s):  
Esra Mete Güneyisi ◽  
Mario D'Aniello ◽  
Raffaele Landolfo
Keyword(s):  
Structural Response ◽  
Time History ◽  
Seismic Behaviour ◽  
Steel Moment Resisting Frames ◽  
Residual Drift ◽  
Moment Resisting Frames ◽  
Drift Ratio ◽  
Nonlinear Time History Analyses ◽  
Moment Resisting ◽  
Nonlinear Time History

In recent decades, several passive energy dissipation systems have been conceived in order to minimize the damage in structural and non-structural components of either new or existing buildings. In this study, the use of friction damped tension-compression diagonal braces for seismic upgrading of a steel moment resisting frames is investigated. To this aim, nonlinear time history analyses have been carried out on a set of representative frames with and without friction damped braces. In the nonlinear time history analyses, two sets of natural accelerograms compatible with seismic hazard levels of 10% and 2% probability of exceedance in 50 years have been considered. Under these records, the structural response has been comparatively investigated in terms of the maximum inter-storey drift ratio, maximum storey acceleration, residual drift ratio and displacement demand for the friction device. The results clearly highlighted that the application of friction damped braces allows reducing the damages to the main structural elements, thus significantly improving the seismic behaviour of the frame.

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