scholarly journals Shaking Table and Numerical Seismic Performance Evaluation of a Fluid Viscous-Dissipative Bracing System

2012 ◽  
Vol 28 (4) ◽  
pp. 1619-1642 ◽  
Author(s):  
Stefano Sorace ◽  
Gloria Terenzi ◽  
Fabio Fadi
Keyword(s):  
Shaking Table ◽  
Frame Structure ◽  
Building Performance ◽  
Seismic Performance Evaluation ◽  
Damping Coefficients ◽  
Final Performance ◽  
Interstory Drift ◽  
Protection Technology ◽  
Bracing System ◽  
Steel Frame Structure

A shaking table campaign was carried out on a 2:3-scale, two-story steel frame structure retrofitted by a dissipative bracing system incorporating pressurized fluid viscous spring-dampers. Up to 1.16 g peak ground accelerations were imposed in the most severe of the 33 tests developed. The response was always elastic, with maximum interstory drift ratios limited below 0.62%. The protection technology, in fact, features high dissipative capacities and produced equivalent linear viscous damping coefficients up to 37.5%. A numerical enquiry carried out on the test structure in its original unbraced configuration showed interstory drift reductions from about 80% to about 90% when passing to dissipative braced conditions. A final performance-based analysis developed in terms of interstory drifts and beam and column rotations, in compliance with the criteria formulated in ASCE/SEI 41-06 Standard, emphasized three through five enhancements of building performance in retrofitted conditions for the four earthquake levels examined.

Feasibility Study of Tank Failure Test With “E-Defense”

2002 ◽  
Author(s):  
Shojiro Oka ◽  
Kouichi Kajiwara ◽  
Tomohiro Itoh
Keyword(s):  
Feasibility Study ◽  
Large Scale ◽  
Earth Science ◽  
Shaking Table ◽  
Frame Structure ◽  
Test Facility ◽  
Specimen Handling ◽  
Kobe Earthquake ◽  
Preliminary Planning ◽  
Steel Frame Structure

After the 1995 Kobe earthquake in Japan, National Research Institute for Earth Science and Disaster Prevention started to construct a large-scale 3-D shaking table, called “E-Defense”. The facility is to be completed in 2005, and failure experiments of many kinds of structures are to be performed. As for a feasibility study of those experiments, a plan of a full-scale tank failure test was investigated. A steel cylindrical tank of 990m3 capacity was selected as a typical liquid storage tank. The height is about 15m and the diameter is about 10m. The total mass, with full of water, is about 1 MN (1,000 tonf). The tank is constructed on a steel frame structure for specimen handling and test facility protection, and set on the shaking table. To prevent facility failure due to a mass of water leakage, waterproof walls are necessary at the lower part of the frame. Ground motion recorded at the Kobe earthquake is applied to the shaking table, and elephant foot bulge buckling is expected to occur at the bottom portion of the tank. Through this preliminary planning, technical feasibility of tank failure tests was confirmed, and problems to be solved for actual planning were clarified.

scholarly journals Shaking Table Test for Evaluating the Seismic Performance of Steel Frame Retrofitted by Buckling-Restrained Braces

2021 ◽  
Vol 2021 ◽  
pp. 1-17
Author(s):  
Tingting Wang ◽  
Jianhua Shao ◽  
Chao Zhao ◽  
Wenjin Liu ◽  
Zhanguang Wang
Keyword(s):  
Seismic Performance ◽  
Shear Force ◽  
Seismic Waves ◽  
Shaking Table Test ◽  
Steel Frame ◽  
Shaking Table ◽  
Frame Structure ◽  
Acceleration Response ◽  
Buckling Restrained Brace ◽  
Interstory Drift

To investigate the seismic performance of buckling-restrained braces under the earthquake action, the shaking table test with a two-story 1/4 scale model is carried out for the ordinary pure steel frame and the buckling-restrained bracing steel frame with low-yield-point steel as the core plate. The failure modes, dynamic characteristics, acceleration response, interstory drift ratio, strain, shear force, and other mechanical properties of those two comparative structures subjected to different levels of seismic waves are mainly evaluated by the experiment. The test results show that under the action of seismic waves with different intensities, the apparent observations of damage occur in the pure frame structure, while no obvious or serious damage in the steel members of BRB structure is observed. With the increase in loading peak acceleration for the earthquake waves, the natural frequency of both structures gradually decreases and the damping ratio gradually increases. At the end of the test, the stiffness degradation rate of the pure frame structure is 11.2%, while that of the buckling-restrained bracing steel frame structure is only 5.4%. The acceleration response of the buckling-restrained bracing steel frame is smaller than that of the pure steel frame, and the acceleration amplification factor at the second story is larger than that at the first story for both structures. The average interstory drift ratios are, respectively, 1/847 and 1/238 for the pure steel frame under the frequent earthquake and rare earthquake and are 1/3000 and 1/314 for the buckling-restrained bracing steel frame, which reveals that the reduction rate of lateral displacement reaches a maximum of 71.71% after the installation of buckling-restrained brace in the pure steel frame. The strain values at each measuring point of the structural beam and column gradually increase with the increase of the peak seismic acceleration, but the strain values of the pure steel frame are significantly larger than those of the buckling-restrained bracing steel frame, which indicates that the buckling-restrained brace as the first seismic line of defense in the structure can dramatically protect the significant structural members. The maximum shear force at each floor of the structure decreases with the increase in height, and the shear response of the pure frame is apparently higher than that of the buckling-restrained bracing structure.

SHAKING TABLE TEST ON COLLAPSE BEHAVIOR OF SMALL-SCALE STEEL FRAME STRUCTURE

2007 ◽  
Vol 72 (620) ◽  
pp. 125-132 ◽  
Author(s):  
Yuko SHIMADA ◽  
Motoki AKAZAWA ◽  
Yosuke ITO ◽  
Yuichi MATSUOKA ◽  
Satoshi YAMADA ◽  
...  
Keyword(s):  
Shaking Table Test ◽  
Steel Frame ◽  
Shaking Table ◽  
Frame Structure ◽  
Small Scale ◽  
Collapse Behavior ◽  
Steel Frame Structure

Seismic Behavior Study of External Wall Panels in Steel Frames

2011 ◽  
Vol 243-249 ◽  
pp. 1425-1428 ◽  
Author(s):  
Ming Ji Fang
Keyword(s):  
Shaking Table Test ◽  
Dynamic Properties ◽  
Steel Frame ◽  
Shaking Table ◽  
Frame Structure ◽  
External Wall ◽  
Behavior Study ◽  
Wall Panels ◽  
Seismic Behaviors ◽  
Steel Frame Structure

The shaking table test of a full-scale steel frame structure with ALC external wall panels is performed in this paper. Based on the experimental results, the seismic behaviors of ALC external walls and joints are studied, such as the destruction properties of ALC external walls and joints and the effects of external walls on the dynamic properties of steel frame. Several useful conclusions and suggestions are presented in the paper.

Deterministic and Probabilistic Analysis of Steel Frame Bracing System Efficiency

2013 ◽  
Vol 390 ◽  
pp. 172-177 ◽  
Author(s):  
Juraj Králik
Keyword(s):  
Nuclear Power ◽  
Power Plants ◽  
Passive Control ◽  
Steel Frame ◽  
Frame Structure ◽  
Control Structures ◽  
Stress Strain Relation ◽  
Passive Response ◽  
Bracing System ◽  
Steel Frame Structure

The present paper is conceived so as to give a general image of the problems concerning the passive response-control structures. An attempt to organize the different aspects of the passive control of seismic structural vibrations in a rational way is made. Choice of optimal bracing system was tested on 10-storey administrative building steel frame structure in nuclear power plants. Dynamic and strength characteristic classical bracing system in form V and X and system with TPEA devices are presented. Analytical stress-strain relation for refined plasticity model and stiffness matrix for TPEA devices are presented in good agreement with experimental results. The element COMBIN39 from ANSYS library using to nonlinear model is very effective. Bracing system with TPEA device show that the energy-dissipation capacity of the structure increases and then the seismic effects are maximal reduced using it.

Shaking Table Tests on a Passive Equipment Isolation System for Earthquake Protection

2009 ◽  
Author(s):  
Maurizio De Angelis ◽  
Salvatore Perno ◽  
Anna Reggio ◽  
Gerardo De Canio ◽  
Nicola Ranieri
Keyword(s):  
Steel Frame ◽  
Shaking Table ◽  
Frame Structure ◽  
Shaking Table Tests ◽  
Isolation System ◽  
Industrial Plants ◽  
Steel Frame Structures ◽  
Rigid Mass ◽  
Passive Isolation ◽  
Steel Frame Structure

The present work refers to steel frame structures in industrial plants. A passive isolation system for seismic protection of a considerable equipment, already present on a frame support structure and rigidly constrained to it, is investigated through both numerical simulations (1+1 DOF system) and shaking table tests on a 1:5 scale two-story steel frame structure. The equipment (e.g. a pipeline, a compressor unit, ...) is modelled as a rigid mass. The optimal design is determined by minimizing the dynamic response of the isolated mass. In order to ensure strenght and serviceability, the response of the frame is also monitored.

scholarly journals Experimental Research on Passive Control of Steel Frame Structure Using SMA Wires

2013 ◽  
Vol 2013 ◽  
pp. 1-12 ◽  
Author(s):  
Shi Yan ◽  
Jian Niu ◽  
Peng Mao ◽  
Gangbing Song ◽  
Wei Wang
Keyword(s):  
Passive Control ◽  
Shaking Table Test ◽  
Steel Frame ◽  
Shaking Table ◽  
Dynamic Responses ◽  
Frame Structure ◽  
Seismic Load ◽  
Control Effect ◽  
Maximum Displacement ◽  
Steel Frame Structure

Mechanical properties of shape memory alloy (SMA) wires were experimentally researched in this paper, and an energy dissipater made of SMA wire cable was designed and applied in a steel frame structure model by using superelasticity characteristics of SMAs to passively reduce dynamic responses of the steel frame structure under seismic load. For the characteristics of large relative displacements between the stories of the steel frame structure on both diagonal ends and the consideration of initial prestrain effects of the SMA cables, three kinds of the whole control, the part control, and no control of the shaking table tests and numerical simulations were carried, respectively. Through the results of the shaking table test and numerical simulation analysis, the dynamic responses such as the maximum displacement, velocity, and acceleration at the top layer of the steel frame structure applied with SMA cables are significantly decreased compared with the no control case. However, considering the premise of both effectiveness and efficiency, the part control effect is superior to the whole control. In many cases, it can meet the control requirement of reducing the maximum displacement and acceleration, while the superelasticity of SMAs can be sufficiently played, realizing the passive control purposes of the steel frame structure based on the energy dispassion through the application of the SMA cables. The proposed method has broad application prospects in the passive control field of building structures.

scholarly journals Dynamic Analysis of Steel Frame Structure (Regular in Plan) using Curved Bracing Systems

2019 ◽  
Vol 8 (10) ◽  
pp. 4159-4165
Keyword(s):  
Seismic Analysis ◽  
Weight Ratio ◽  
Steel Structures ◽  
High Strength ◽  
Frame Structure ◽  
Design Parameters ◽  
Lateral Loads ◽  
And Performance ◽  
Bracing System ◽  
Steel Frame Structure

Steel structures provide better resistance against lateral and various other combinations of loads. Steel structures have various advantages over RCC structures as they have high strength to weight ratio, uniformity, elasticity flexibility and take minimum time for erection (as large prefabricated structures are available). Steel is recyclable too. Bracing systems are well known to increase the stiffness of any type of structure. Using bracing system in steel structures increases the stiffness of the structures to a large extent. In present paper, the evaluation of different kinds of curved bracing system was carried out for steel framed structure while performing dynamic seismic analysis as per IS:1893:2016. The behavior and performance of various shaped of curved bracing was analyzed in software staad.pro and results were collected and represented in the form of tables, graphs and figures. For this purpose, 14 storey regular building was chosen and different geometric and design parameters were taken as per the codal provisions. The height of each floor was considered as 3.6m. Whereas, the plan of the building entails 6 x 6 bays in both the direction and the size of each panel was taken as 5 x 5m. After scrutinizing the results gathered, it can be concluded that ‘AV Arc’ bracing system is the most effective bracing system and it can be used effectively to resist lateral loads such as earthquake loads

The Influence of Seismic Motion Input Direction and Damping on the Dynamic Analysis of Mega Steel-Frame Structure

2011 ◽  
Vol 295-297 ◽  
pp. 236-239
Author(s):  
Guo Lin Xu ◽  
Ya Shuang Bai ◽  
Wen Gang Chen
Keyword(s):  
Dynamic Analysis ◽  
Steel Frame ◽  
Dynamic Responses ◽  
Frame Structure ◽  
Seismic Load ◽  
Calculation Methods ◽  
Damping Coefficients ◽  
Seismic Motion ◽  
Load Action ◽  
Steel Frame Structure

A more accurate simulation of the response to the structure under seismic load action can be generated through taking bi-directional seismic motion input into consideration. The commonly used four calculation methods of bi-directional input are adopted in this paper to compare the different dynamic responses of mega steel-frame structure to seismic load action. The paper also provides a method for choosing Raleigh damping coefficients applicable to the dynamic analysis of mega steel-frame structure.

A New Measure to Reduce the Potential for Progressive Collapse of Steel Frame Structure

2012 ◽  
Vol 256-259 ◽  
pp. 905-910
Author(s):  
Chuan Qing Liu ◽  
Zuo Yun Mei ◽  
Xue Guang Gao
Keyword(s):  
Progressive Collapse ◽  
Vertical Displacement ◽  
Steel Frame ◽  
Frame Structure ◽  
Plastic Hinges ◽  
Column Removal ◽  
Steel Frame Structures ◽  
The Moment ◽  
Bracing System ◽  
Steel Frame Structure

In order to improve the capacity of resistance to progressive collapse for steel frame structures, a new measure, which uses bracing systems to help damaged frame to bridge across the local damage caused by abnormal loads, is presented in this study. The dynamic progressive collapse analysis is carried out to investigate the effect of resistance to progressive collapse in two different cases of column removal. Analytical results show that bracing systems on the top of steel frame structure have obvious effects on collapse prevention. Comparison with the unbraced steel frame structure, fixing bracing system could decrease the vertical displacement of the node corresponding to the top of the removed columns, and reduce the moment peak value at the end section of beams. And after column removal, plastic hinges come into being in the unbraced steel frame, on the other hand, there are no plastic hinges formed in the steel frame with bracing system.

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