Search results

Resisting Seismic Behavior Study of an Adding Cover—Plate Protocol Used For D—Type Eccentrically Braced Steel Frames Xiuzhen Pan 1,a, Jiping Hao 2,b, Jie Gao 3,c 1Xi’ an University of Technology, Institute of Water Resources and Hydraulic Power, China 2Xi’ an University of Architecture and Technology, School of Civil Engineering, China 3China United Northwest Institute for Engineering Design and Research, China a:13571828178@163.com, b: haojiping@xauat.edu.cn, c: ggjie2003@163.com Keywords: D—Type Eccentrically Braced Steel Frame; Link Beam; Cover-Plate; Shell Element; Finite Element Abstract.
Results indicate that the new type of eccentrically braced steel frame have enough stiffness and deformation capacity, draw link away from flange of column, and dissipate more earthquake energy.
The single diagonal eccentrically braced frames adopted adding cover-plate protocol will ensure sufficient lateral stiffness under ordinary circumstances, including lateral loads due to wind and moderate seismic disturbances, have preferable resisting seismic behavior under rare earthquake, and be so practical and costly that it can be easily applied in present project.
If are these protocols used for eccentrically braced steel frame？
References [1] Taichiro Okazaki: Seismic Performance of Link-to-Column Connections in Steel Eccentrically Braced Frames (Proquest Information and Learning Company, the University of Texas of Austin, 2004)

The effect of structural parameters on seismic behavior of concrete-filled steel tubular frames with buckling-restrained brace Feng-Ming REN 1, a, Jie-Biao ZHANG 1, b, Yun ZHOU 2.c and Xiu-Li DU3, d 1 School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou 51006, China; 2 School of Civil Engineering, Guangzhou University, Guangzhou 510006, China 3 College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China arfm@gdut.edu.cn, bsaijbz@126.com Keywords: CFST frame; buckling-restrained brace; axial compression ratio; steel ratio; seismic behavior Abstract.
In order to study the parameters influence on seismic behavior of concrete filled steel tubular (CFST) frame with bucking-restrained brace (BRB), the finite element analysis for CFST frame with BRB is studied in this paper, which is performed under low cyclic loading using the software of ABAQUS.
By changing the axial compression ratio of the column(n) and the steel ratio(α) of the column section respectively, the effect of the structural parameters on the seismic behavior of the CFST frames with BRB had been studied.
However, the researches that effect of structural parameters on seismic behavior of CFST frames with buckling-restrained brace (BRB) are relatively few.
By changing the axial compression ratio of the column and the steel ratio of the column section respectively, the effect of the structural parameters on the seismic behavior is studied.

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.
Introduction The knee braced steel frame is an alternative structural system, which combines high ductility and lateral stiffness, for earthquake-resistant steel structures.
The knee braced frame uses a secondary structural member (the knee member) as the “structural fuse” to ensure ductility and achieves good lateral stiffness through the setting of the diagonal brace.
Steel frame under study Numerical investigations were carried out to assess the effects of the introduction of knee bracing elements on the seismic performance of steel frames.
In the knee braced frame the diagonal braces provide lateral stiffness and the knee elements, that are secondary members, provide ductility and energy dissipation through yielding.

Experimental Study On Seismic Behavior of High Strength Steel Composite K-Type Eccentrically Braced Frames Liusheng Duan1, a, Mingzhou Su1, b and Hui Li2, c 1School of civil engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China 2Chengdu Jizhun Fangzhong Architectural Design Associates, Chendu 610017, China aduanliusheng@126.com, bsumingzhou@163.com Keywords: high strength steel, K-type eccentrically braced frame, monotonic tests, cyclic tests, seismic behavior.
The failure modes and the main indexes of seismic behavior of specimens with various links length were analyzed.
This paper studied the seismic behavior of high strength steel composited K-Type eccentrically braced frames, four 1/2 scaled plane specimens were tested under monotonic and cyclic loading.
The failure modes and the index of seismic behavior were analyzed.
Li，et al．Experimental study on hysteretic behavior of K and Y-eccentrically braced steel frames [J]．Building Structure，2010，40(4)：9-12．

Pourabdollah [9] studied seismic performance of K-bracing by improving the K braced joints, result showed that the reasonable joints made the seismic behavior of K-bracing to be better.
Peng [10] studied effect of layout of bracing on lateral stiffness of steel frames by finite element analysis, result showed that the lateral stiffness of the structures varied with the positions of bracing.
Chen and Ke [12] proposed a kind of high strength moment resisting frame with energy dissipation beams system, which had external link beams and unbraced frames, result showed that the system had excellent seismic behavior.
Chen, Effects of layout of bracing on lateral stiffness of steel frames, J.
Goel, Seismic evaluation and upgrading of chevron braced frames.

Though this tendency is reduced, the low post-yield stiffness in buckling-restrained braces (BRBs) can cause analogous behavior in buckling-restrained braced frames (BRBFs) [6, 7].
References [1] Khatib, "Seismic behavior of concentrically braced frames," Rept.
Goel, "Seismic evaluation and upgrade of chevron braced frames," J.
Nakashima, "Effect of gravity columns on mitigation of drift concentration for braced frames," J.
Roeder, "Effect of Column Stiffness on Braced Frame Seismic Behavior," ASCE, J.

To ensure the system seismic behavior, gusset plate connections should have enough resistance and stiffness to comply with the frames.
To ensure the system seismic behaviour, the gusset plate connections should have enough resistance to transfer the brace force to the frame.
A bilinear, kinematic hardening plastic material model was adopted to simulate the inelastic behaviour of steel under cyclic loading, where elastic modulus E is 206GPa, second stiffness E2 is 1%E, poison ratio ν=0.3.
Decomposition of Brace and Frame Action Braced frames could be considered as dual system which is the combination of frame behaviour and brace behavior.
“Seismic design of steel special concentrically braced frame systems”.

Introduction Braced steel framework is divided into central braced frames and eccentrically braced frames.
Therefore, application of test method study mechanical behavior of link beam under cyclic loading to guide K-braced steel frame design and related research has important practical significance.
K-shape eccentrically braced frame stiffness remained unchanged before yield; when link beam of K-shape eccentrically braced frame occurs shear yielding, stiffness degradation become apparent.
K-shape eccentrically braced frame stiffness remained unchanged before yield.
[4] ZHUNAG Xiao-yong, in: Behavior study of K shape eccentrically braced steel frames under cyclic load, edited by Xi’an University of Science and Technology, Xi’an (2006).

After this paper applies nonlinear finite element program to analyze the behaviors of eccentrically braced steel frames under cyclic load, the seismic design recommendations of eccentrically brace are presented.
This paper applies nonlinear finite element program BSNFEM to analyze the behaviors of eccentrically braced steel frames under cyclic load.
Seismic Design Recommendations (1)Eccentrically braced steel frames are a lateral load-resisting system which apply high intensity area and it can provide the high elastic stiffness that met higher steel building drift requirement
Seismic Eccentrically Braced Frames.
Ghobarah..Analytical Model for Shear-Link Behavior.

Finite Element Analysis of the Seismic Behaviors on Web-Bolted Connected of Replaceable Shear Links for Eccentrically Braced Steel Frame Chiyun Zhao1, a *, Kai Gong 2, b 1Beijing Research Center for Engineering Structures and New Materials, Beijing University of Civil Engineering and Architecture, Beijing, 100044, P.R.China 2Beijing University of Civil Engineering and Architecture, P.R.China azhaocy@bucea.edu.cn, mmaboutfuture@163.comb Keywords: eccentrically braced steel frames; the replaceable shear link; the finite element analysis software of ABAQUS; the bolted web connections; seismic performance; deformation performance Abstract.
As can be seen from the above, the seismic performance of eccentrically braced steel frame has certain potential security risks.
Energy dissipations of the replaceable shear link and hysteretic behaviors of the eccentrically braced steel frame with replaceable shear links were analyzed in this paper under the cyclic loading by the finite element analysis software of ABAQUS.
Dual high-strength steel eccentrically braced frames with removable links.
Behavior Study of K Shape Eccentrically Braced Steel Frames under Cycle Load .Xi'an University of Technology, 2006.6