Shear distribution of CBSF under far-field strong earthquakes

2020 ◽  
pp. 18-29
Author(s):  
WANG BINGJIAN ◽  
ZHANG KAI ◽  
GU QIANG
Keyword(s):  
Steel Frames ◽  
Far Field ◽  
Strong Earthquakes ◽  
New Model ◽  
Structure Feature ◽  
Shear Distribution ◽  
History Analysis

Six chevron braced steel frames are studied using elastc-plastc tme history analysis when sufered from farfault major earthquakes. According to the structure of story shear distributon curve, proposes a new model which can be used to design CBSF structure story shear distributon patern, with the story shear distributon paterns and elastcplastc tme history analysis results contrast, indicated this model has higher accuracy; Discusses the structure feature, the ground moton characteristcs of the infuence of story shear distributon.

Correlation between Damage Indexes in Knee Bracing Frames Subjected to Earthquakes

2011 ◽  
Vol 255-260 ◽  
pp. 2350-2354
Author(s):  
Kamran Faraji ◽  
Mahmoud Miri
Keyword(s):  
Structural Damage ◽  
Steel Frames ◽  
Time History ◽  
Deformation Energy ◽  
Hysteretic Behavior ◽  
Nonlinear Time History Analysis ◽  
Damage Level ◽  
History Analysis ◽  
Nonlinear Time History ◽  
Earthquake Accelerograms

For vulnerability assessment of structures, different damage indexes have been established by researchers that estimate the structural damage level. In these indexes different parameters have been used for calculating structural damage level. In this paper, damage indexes based on deformation, energy and cycle hysteretic behavior are investigated in order to find a correlation between their numerical values. The selected damage indexes are calculated and compared by applying them in nonlinear time history analysis of low and intermediate rise knee braced steel frames subjected to a set of seven earthquake accelerograms. Correlations between various indexes have been presented graphically and approximate conversion formulas are also provided.

Research about Influence of Strength Variability on Seismic Performance of Weak Shear Type Concentrically-Braced Steel Frames

2011 ◽  
Vol 243-249 ◽  
pp. 1396-1400
Author(s):  
Yong Sheng Qi ◽  
Feng Hua Zhao ◽  
Jun Wen Zhou
Keyword(s):  
Seismic Performance ◽  
Steel Frames ◽  
Time History ◽  
Nonlinear Time History Analysis ◽  
Analysis Method ◽  
History Analysis ◽  
Concentrically Braced ◽  
Shear Type ◽  
Nonlinear Time History ◽  
Strength Variability

Influence of strength variability of braces on the weak shear type concentrically-braced steel frames is studied by pushover and nonlinear time history analysis method, which leads to a conclusion that the overstrength of brace has obviously detrimental influence on the seismic performance of the structure, induces stronger seismic reaction and higher seismic risk. Another valuable discovery is that after the area of the braces of weak shear type centrically-braced steel frames are determined according to the requirement of current codes, the designer can intentionally specify the structural steel of comparatively low strength (for example, the 2nd group in the paper taking 70% strength of steel Q235) for the brace, which can provide the structure more excellent seismic performance.

scholarly journals Seismic resistance estimation of multi-story steel frames under ductility level earthquake impact by nonlinear static method

2021 ◽  
Vol 263 ◽  
pp. 03011
Author(s):  
Maksim Zubritskiy ◽  
Oleg Ushakov ◽  
Linar Sabitov ◽  
Karina Nabiullina
Keyword(s):  
Characteristic Point ◽  
Steel Frames ◽  
Time History ◽  
Time History Analysis ◽  
Static Method ◽  
Seismic Resistance ◽  
Vibration Modes ◽  
History Analysis ◽  
Point Search ◽  
Nonlinear Static

The article proposes a technique for taking into account the higher vibration modes under seismic resistance estimation of multi-story steel frames by nonlinear static method. The characteristic point search has also been improved. As part of the study, the proposed method was verified by time history analysis. Proposed technique allows one to significantly reduce the calculation time, while excluding the deficit of seismic resistance.

Dynamic Analyses of Semi-Rigid Connection Low Yield Point Steel Frames

2013 ◽  
Vol 351-352 ◽  
pp. 524-527
Author(s):  
Cui Ling Ma ◽  
Song Dan Sun ◽  
Xian Lei Cao
Keyword(s):  
Steel Frames ◽  
Time History ◽  
Steel Frame ◽  
Frame Structure ◽  
History Analysis ◽  
Dynamic Analyses ◽  
Rigid Connection ◽  
Rotation Stiffness ◽  
Analytic Models ◽  
Steel Frame Structure

Based on the analysis for 10 series (altogether 50) of finite element analytic models, the time-history analysis is discussed in this paper to investigate the relations between frame parameters of semi-rigid steel frames, these parameters include the frame's floor number, the frame's span number, especially the rotation stiffness of beam-to-column connections. Comparing with the steel frame structure, the ductility of semi-rigid steel frame structure is improved with the reduction in the rotation stiffness of connections. Furthermore, semi-rigid steel frame structure under seismic loads has a good seismic performance.

scholarly journals Effect of the Improved Pall Friction Damper on the Seismic Response of Steel Frames

2017 ◽  
Vol 7 (4) ◽  
pp. 1833-1837 ◽  
Author(s):  
P. H. Sarjou ◽  
N. Shabakhty
Keyword(s):  
Seismic Response ◽  
Linear Time ◽  
Steel Frames ◽  
Time History ◽  
Friction Damper ◽  
Base Shear ◽  
Absorbed Energy ◽  
Steel Bracing ◽  
History Analysis ◽  
Energy Absorbing

Energy-absorbing dampers are used to reinforce structures which are vulnerable to earthquakes. This study evaluates the performance of Improved Pall Frictional Dampers (IPFD) which is a type of Pall Frictional Damper (PFD). For this purpose, this study compares the performances of steel frames with concentric steel bracing reinforced by IPFD and steel frames with concentric steel bracing with no damper. Frames with different stories and pans were modelled in sap2000 and exposed to accelerograms of earthquakes for non-linear time history analysis. Results of analysis were studied; parameters such as story displacement, base shear and absorbed energy were compared in steel frames with damper and without damper.

scholarly journals Research on residual drift response of steel frames under strong earthquakes

2017 ◽  
Vol 19 (6) ◽  
pp. 4365-4377 ◽  
Author(s):  
Ergang Xiong ◽  
Zhaoqi Yan ◽  
Tian Li ◽  
Lanwei Yang
Keyword(s):  
Steel Frames ◽  
Strong Earthquakes ◽  
Residual Drift
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