The effect of semi-rigid joints and an elastic bracing system on the buckling load of simple rectangular steel frames

2005 ◽  
Vol 61 (9) ◽  
pp. 1205-1225 ◽  
Author(s):  
Ioannis G. Raftoyiannis
Keyword(s):  
Steel Frames ◽  
Buckling Load ◽  
Bracing System ◽  
Rigid Joints

scholarly journals Influence of joint rigidity on the elastic buckling load of sway and non-sway steel frames

2018 ◽  
Author(s):  
Abd-Nacer-Touati Ihaddoudène ◽  
Messaoud Saidani ◽  
Jean-Pierre Jaspart
Keyword(s):  
Steel Frames ◽  
Computational Effort ◽  
Buckling Load ◽  
Elastic Buckling ◽  
Model Stability ◽  
The Past ◽  
Proposed Model ◽  
Joint Rigidity ◽  
Rigid Joints ◽  
Sway Frames

Much work has been conducted in the past on the influence of the rigidity of structural joints on the behavior of steel frames. Buckling of a column is fundamental to the design of load bearing structures mainly when the analysis of such frames takes into account the effect of the connection flexibility. The present work deals with such an effect on the elastic buckling load of plane steel frames. The proposed model consists in the development of comprehensive approach taking into account, the effects of the joint rigidity, the elastic buckling load for both sway and non-sway frames. Only one element is required over the length of the element to model stability, which let to solve practical problem with little computational effort. Some practical formulas for determining critical load for plane steel frames are then presented. The elastic buckling load is found to be strongly affected by semi-rigid joints and reveals that the proposed model is computationally very efficient with the expressions presented being general.

scholarly journals Seismic Response Analysis of Multi-Story Steel Frames Using BRB and SCB Hybrid Bracing System

2019 ◽  
Vol 10 (1) ◽  
pp. 284 ◽  
Author(s):  
Rong Chen ◽  
Canxing Qiu ◽  
Dongxue Hao
Keyword(s):  
Seismic Response ◽  
Seismic Analysis ◽  
Steel Frames ◽  
Residual Deformation ◽  
High Energy ◽  
Response Analysis ◽  
Building Structures ◽  
Seismic Capacity ◽  
Story Drift ◽  
Bracing System

Multi-story steel frames are popular building structures. For those with insufficient seismic resistance, their seismic capacity can be improved by installing buckling-restrained braces (BRBs), which is known for high energy dissipation capacity, and the corresponding frame is denoted as BRB frame (BRBF). However, BRBFs are frequently criticized because of excessive residual deformations after earthquakes, which impede the post-event repairing work and immediate occupancy. Meanwhile, self-centering braces (SCBs), which were invented with a particular purpose of eliminating residual deformation for the protected structures, underwent fast development in recent years. However, the damping capability of SCBs is relatively small because their hysteresis is characterized by a flag shape. Therefore, this paper aims to combine these two different braces to form a hybrid bracing system. A total of four combinations are proposed to seek an optimal solution. The multi-story steel frames installed with BRBs, SCBs, and combined braces are numerically investigated through nonlinear static and dynamic analyses. Interested seismic response parameters refer to the maximum story drift ratios, maximum floor accelerations, and residual story drift ratios. The seismic analysis results indicate that the frames using the combined bracing system are able to take the advantages of BRBs and SCBs.

Evaluation of the seismic performance of off-centre bracing system with ductile element in steel frames

2012 ◽  
Vol 12 (5) ◽  
pp. 445-464 ◽  
Author(s):  
Mohammad Bazzaz ◽  
Ali Kheyroddin ◽  
Mohammad Ali Kafi ◽  
Zahra Andalib
Keyword(s):  
Seismic Performance ◽  
Steel Frames ◽  
Bracing System

Mechanical model for the analysis of steel frames with semi rigid joints

2009 ◽  
Vol 65 (3) ◽  
pp. 631-640 ◽  
Author(s):  
A.N.T. Ihaddoudène ◽  
M. Saidani ◽  
M. Chemrouk
Keyword(s):  
Mechanical Model ◽  
Steel Frames ◽  
Rigid Joints

05.37: On stability of unbraced steel frames with semi-rigid joints

ce/papers ◽  
2017 ◽  
Vol 1 (2-3) ◽  
pp. 1363-1370
Author(s):  
Przemysław Krystosik
Keyword(s):  
Steel Frames ◽  
Rigid Joints

Buckling of Flexural-Shear Bracing System and Its Braced Steel Frames

2015 ◽  
Vol 18 (11) ◽  
pp. 1831-1844 ◽  
Author(s):  
L. Zhang ◽  
G.S. Tong ◽  
Y. Ji
Keyword(s):  
Steel Frames ◽  
Bracing System

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.

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