Dissipative Knee Bracing for Seismic Strengthening of Steel Frames

2013 ◽  
Vol 743 ◽  
pp. 123-127
Author(s):  
Marco Valente
Keyword(s):  
Seismic Performance ◽  
Steel Frames ◽  
Seismic Intensity ◽  
Steel Frame ◽  
Shear Behaviour ◽  
Improvement Strategy ◽  
Seismic Behaviour ◽  
Nonlinear Static ◽  
Knee Elements ◽  
Nonlinear Dynamic Analyses

This study investigates the effectiveness of dissipative knee bracing as seismic performance improvement strategy for steel frames. A simplified model of a knee element is used for global analyses of frames in order to accurately simulate the bending and shear behaviour observed in laboratory tests reported in literature. The seismic response of a five-storey steel frame incorporating dissipative knee elements is investigated. Nonlinear static analyses are performed to estimate the deformation capacity of the frame and to assess the sequence of yielding in the members. Nonlinear dynamic analyses with different seismic intensity levels are carried out to compare the seismic behaviour of the steel frame in the unprotected and protected configurations. The results of the numerical investigations show that the use of knee elements has the potential to improve the seismic performance of steel frames.

Displacement-Based Seismic Design of Steel Frames Strengthened by Buckling-Restrained Braces

2012 ◽  
Vol 217-219 ◽  
pp. 1114-1118 ◽  
Author(s):  
Marco Valente
Keyword(s):  
Steel Frames ◽  
Design Procedure ◽  
Steel Frame ◽  
Seismic Retrofitting ◽  
Target Displacement ◽  
Earthquake Excitation ◽  
Capacity Spectrum ◽  
Buckling Restrained Braces ◽  
Displacement Based ◽  
Nonlinear Dynamic Analyses

This study presents a displacement-based design procedure for seismic retrofitting of steel frames using buckling-restrained braces (BRB) to meet a given target displacement in the framework of the capacity spectrum method. The seismic performance of a six-storey steel frame equipped with BRB is investigated. Different storey-wise BRB distribution methods are proposed and the influence on the results of the design procedure is analyzed. Nonlinear dynamic analyses demonstrate the efficacy of the design procedure showing the improvements achieved by the retrofitting intervention using BRB. The maximum top displacement registered for the retrofitted frame under earthquake excitation coincides with the target displacement obtained in accordance with the design procedure. The introduction of buckling-restrained braces enhances the earthquake resistance of the steel frame, providing significant energy dissipation and the stiffness needed to satisfy structural drift limits.

Seismic Performance Study on Steel Frame Structures with Integral Panel

2012 ◽  
Vol 166-169 ◽  
pp. 2373-2378
Author(s):  
He Tao Hou ◽  
Ming Lei Wu ◽  
Miao Liu ◽  
Qin Ma
Keyword(s):  
Seismic Performance ◽  
Steel Frames ◽  
Steel Frame ◽  
Composite Panels ◽  
Structural System ◽  
Performance Study ◽  
Relevant Research ◽  
Steel Frame Structures ◽  
Energy Dissipation Capacity ◽  
Economic Use

In recent years, wall panels have been more and more used in the steel residential houses. A series of investigations on the seismic performance of the steel frame with composite panels have been carried out. According to the connection types between the steel frames and the panels, the structural system can be divided into two kinds: steel frames with hanging composite panels and steel frame infilled with composite panels. Results of all researchers revealed that the composite panels could effectively improve the lateral stiffness and bearing capacity of the steel frames, at the same time could enhance the energy dissipation capacity. Morever, in this paper, the relevant research results of connections between the steel frame and composite panels obtained are compared and discussed. This review provides helpful directions to those who are already engaged in composite panels used in the steel residential houses, and points out the simplified method needed to promote safe and economic use of composite panels.

Seismic Protection of Steel Frames Using Friction Damper Devices

2012 ◽  
Vol 267 ◽  
pp. 13-16 ◽  
Author(s):  
Marco Valente
Keyword(s):  
Steel Frames ◽  
Steel Frame ◽  
Seismic Protection ◽  
Friction Damper ◽  
Seismic Excitations ◽  
Friction Damping ◽  
Design Earthquake ◽  
Nonlinear Dynamic Analyses ◽  
Parametric Analyses ◽  
Bracing System

This study investigates a friction damping bracing system in order to improve the response of steel frames when subjected to severe seismic excitations, beyond the design earthquake. A simplified model describing the behavior of the friction damper device was developed for global analyses of steel frames. Parametric analyses based on numerical simulations were carried out to evaluate the slip force with the aim of minimizing the values of top displacement and hysteretic energy dissipated by the steel frame. The main results of nonlinear dynamic analyses performed on a six-story steel frame incorporating friction damping bracing systems are presented and compared with the response of the unprotected counterpart. The effectiveness of the protection system was also assessed by examining the seismic response of the frame equipped with traditional braces, without friction devices. The results of the numerical investigations showed that the use of the friction damping bracing system caused an increase of the dissipative capacity of the frame, above all for high seismic actions. The plastic deformation concentrated inside the device, protecting the main structural elements from severe damage. The formation of the plastic hinges at the column base was delayed with respect to the unprotected frame. Numerical analyses indicated that the introduction of supplemental damping by using friction devices in steel bracings is very effective for seismic protection of steel frames subjected to severe seismic excitations.

scholarly journals Seismic performance of steel frames equipped with buckling-restrained braces (BRBs) using nonlinear static and dynamic analyses

2017 ◽  
Vol 19 (2) ◽  
pp. 1131-1146
Author(s):  
Gholamreza Ghodrati Amiri ◽  
Mahdi Eghbali ◽  
Esmaeil Asadian ◽  
Seyed Ali Razavian Amrei
Keyword(s):  
Seismic Performance ◽  
Steel Frames ◽  
Dynamic Analyses ◽  
Buckling Restrained Braces ◽  
Nonlinear Static

Location of Semi-Rigid Connection Effect On The Seismic Performance of Steel Frame Structures

2021 ◽  
Author(s):  
Emad A. Elhout
Keyword(s):  
Axial Compression ◽  
Seismic Performance ◽  
Steel Frames ◽  
Steel Frame ◽  
Frame Structures ◽  
Compression Force ◽  
Drift Ratio ◽  
Dual Beam ◽  
Story Drift ◽  
Steel Frame Structures

Abstract In design steel frames, combining semi-rigid and rigid connections can result in better structural performance, particularly in seismic locations. In this study, the effects of semi-rigid beam-to-column connections located on the seismic performance of steel frame structures are investigated. The analysis uses six and twelve-story moment resisting steel frames (MRSF) with rigid, semi-rigid, and dual beam-column connections. These frames are designed according to the Egyptian design codes. Drain-2Dx computer program and seven earthquake ground motions are used in the non-linear dynamic analysis. The rotational stiffness of beam-to-column connections is indicated through the end fixity factors with a value equal to 0.6. The performances of these frames are evaluated through the roof drift ratio (RDR), the maximum story drift ratios (SDR), and the maximum column axial compression force (MACF). The results indicated that the quantities of fundamental periods, roof drift ratio, the story drift ratio, and the column axial compression force are related to stiffness, rigidity, and the number of semi-rigid connections in steel frames.

Pseudo-Dynamic Test Analysis of Space Steel Frame with T Steel Connection

2014 ◽  
Vol 886 ◽  
pp. 408-412
Author(s):  
Xin Wu Wang ◽  
Chang Jiao Hu
Keyword(s):  
Seismic Performance ◽  
Steel Frames ◽  
Dynamic Test ◽  
Steel Structure ◽  
Steel Frame ◽  
Test Analysis ◽  
Nodal Displacement ◽  
Displacement Response ◽  
Steel Connections ◽  
Steel Connection

The pseudo-dynamic test on the space steel frame with T steel connections was carried out.The dissertation focused on the analysis of the strain,the nodal displacement,the displacement response and the load feedback of the steel frame and discussed the seismic performance of steel frames with T steel connection which could supply the test basis in perfecting the design of steel structure for our country.

Seismic performance assessment of multi-story steel frames with curved dampers and semi-rigid connections

2021 ◽  
Vol 182 ◽  
pp. 106666
Author(s):  
S.F. Fathizadeh ◽  
S. Dehghani ◽  
T.Y. Yang ◽  
A.R. Vosoughi ◽  
E. Noroozinejad Farsangi ◽  
...  
Keyword(s):  
Performance Assessment ◽  
Seismic Performance ◽  
Steel Frames ◽  
Seismic Performance Assessment
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