Development of Passive Energy Dissipation Device with U-Shaped Steel Damper Based on Quasi-Linear Motion Mechanism

2012 ◽  
Vol 446-449 ◽  
pp. 2656-2660
Author(s):  
Jin He Gao ◽  
Hiroshi Tagawa
Keyword(s):  
Energy Dissipation ◽  
Axial Strain ◽  
Tensile Force ◽  
Seismic Energy ◽  
Lateral Load ◽  
Linear Motion ◽  
Moment Frames ◽  
Motion Mechanism ◽  
Story Drift ◽  
Cyclic Loading Tests

This paper presents a new energy dissipation device for earthquake protection of structures. The proposed device, which uses a quasi-linear motion mechanism, achieves dissipation of seismic energy into the structure through yielding of U-shaped steel dampers. Consequently bracing members are subjected to only tensile force. Cyclic loading tests of the portal moment frames with the proposed device are conducted. Results and discussions are presented with emphasis on key features which affect energy dissipation capability. The lateral load and story drift angle relationships show that the proposed device provides stable and reasonably large energy dissipation capability. The effect of pre-tension applied to the bracing members is also examined through the brace axial strain and lateral load relationship.

Behavior and Design Recommendations of Splice Connection in Weak-Axis Column-Tree Steel Moment Frames

2014 ◽  
Vol 1025-1026 ◽  
pp. 902-905
Author(s):  
Kang Min Lee ◽  
Liu Yi Chen ◽  
Yang Yang ◽  
Keun Yeong Oh ◽  
Sung Bin Hong
Keyword(s):  
Energy Dissipation ◽  
Plastic Hinge ◽  
Moment Frames ◽  
Steel Moment Frames ◽  
Cross Sectional ◽  
Design Recommendations ◽  
Rotation Capacity ◽  
Story Drift ◽  
Ductility Capacity ◽  
Plastic Rotation Capacity

The main objectives of this paper was to investigate the cyclic performance of splice connection in weak-axis column-tree connections with the formation of plastic hinge assumed at splice connection and provide some design recommendations. By reducing the cross-sectional area of the splice plates, the splice connection in this test are designed as a weaken component to utilize the ductility capacity and energy dissipation. The results showed that it could develop the plastic rotation capacity in the beam splice connection and portion in the link beam but not increase the energy dissipation capacity during the same story drift ratio.

scholarly journals Development of Ductile Truss System Using Double Small Buckling-Restrained Braces: Analytical Study

2019 ◽  
Vol 13 (1) ◽  
pp. 10-19
Author(s):  
Hidajat Sugihardjo ◽  
Yudha Lesmana ◽  
Dwi Prasetya
Keyword(s):  
Time History ◽  
Seismic Energy ◽  
Hysteresis Curve ◽  
Structural Elements ◽  
Moment Frames ◽  
Element Analysis ◽  
Seismic Region ◽  
Story Drift ◽  
Steel Sections ◽  
Column Element

Introdution: This paper proposed a Small Buckling-Restrained Brace (SBRB) for the ductile truss moment frames and is called here as the Double Braced Truss Moment Frames (DB-TMF). The braces are located at the edge of the truss girder and are only placed around the building perimeter. The braces work in pair as a weak element (structural fuses) and is expected to effectively absorb the seismic energy. The proposed DB-TMF system is an extended development of the Knee Braced Truss Moment Frames (KB-TMF). The DB-TMF system is expected to carry the whole seismic loads, while the rest of the frame is designed to carry only the gravity loads. Methods: To study the performance of the proposed DB-TMF system, non-linear finite element analysis was carried out using the DRAIN-2DX package. From the analysis with various time history records, it was found that the drift ratio of the DB-TMF system is lower than the allowed story drift. The roof-top displacement shows an asymptotic behavior. The shape of the hysteresis curve tends to have a pinching shape. However, the cumulative ductility of the proposed system satisfies the requirements as a hysteretic structure. In the event of an earthquake, only the SBRB and the chords adjacent to the column element are damaged while the rest of the structural elements remain elastic which is expected. Results and Conclusion: Based on the performance evaluation of the DB-TMF system, the DB-TMF system is suitable for moderate seismic region and has smaller dimension steel sections compared to the KB-TMF system.

Estimation of Seismic Energy Dissipation for Steel Slit Shear Walls Considering Out-of-Plane Buckling

2021 ◽  
Author(s):  
Yiming Ma ◽  
Liusheng He ◽  
Ming Li
Keyword(s):  
Energy Dissipation ◽  
Shear Walls ◽  
Seismic Energy ◽  
Thickness Ratio ◽  
Design Parameters ◽  
Test Results ◽  
Loading Test ◽  
Aspect Ratios ◽  
Out Of Plane ◽  
Energy Dissipation Capacity

Steel slit shear walls (SSSWs), made by cutting slits in steel plates, are increasingly adopted in seismic design of buildings for energy dissipation. This paper estimates the seismic energy dissipation capacity of SSSWs considering out-of-plane buckling. In the experimental study, three SSSW specimens were designed with different width-thickness ratios and aspect ratios and tested under quasi-static cyclic loading. Test results showed that the width-thickness ratio of the links dominated the occurrence of out-of-plane buckling, which produced pinching in the hysteresis and thus reduced the energy dissipation capacity. Out-of-plane buckling occurred earlier for the links with a larger width-thickness ratio, and vice versa. Refined finite element model was built for the SSSW specimens, and validated by the test results. The concept of average pinching parameter was proposed to quantify the degree of pinching in the hysteresis. Through the parametric analysis, an equation was derived to estimate the average pinching parameter of the SSSWs with different design parameters. A new method for estimating the energy dissipation of the SSSWs considering out-of-plane buckling was proposed, by which the predicted energy dissipation agreed well with the test results.

scholarly journals Studying a multistory building with different types of bracing

2018 ◽  
Vol 8 (01) ◽  
Author(s):  
Ahmed Falah Hasan ◽  
Ban Ali Kamil
Keyword(s):  
Low Cost ◽  
Lateral Load ◽  
Wind Load ◽  
Multistory Building ◽  
Different Types ◽  
Story Drift

In this paper the effect of different types of bracing had been studied besides studying the effect of height of building. Two different height was studied the first one was a 6-story and 10-story. The studied types of bracing included the V, X, K, and none bracing building. The X bracing is the best type for resist high lateral load,. The building without bracing give maximum story drift and the building may be collapse due to unstability because the lateral load (wind load), the V-bracing give a little different from X-bracing with low cost and easy for construction from X-bracing, and the building is highest the X-bracing is the beast type for bracing.

scholarly journals Energy Evolution Law of Marble Failure Process Under Different Confining Pressures Based on Particle Discrete Element Method

2021 ◽  
Vol 8 ◽  
Author(s):  
Yan-Shuang Yang ◽  
Wei Cheng ◽  
Zhan-Rong Zhang ◽  
Hao-Yuan Tian ◽  
Kai-Yue Li ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Energy Dissipation ◽  
Axial Strain ◽  
Triaxial Compression ◽  
Failure Process ◽  
Rock Failure ◽  
Biaxial Compression ◽  
Energy Evolution ◽  
Confining Pressures ◽  
Energy Dissipated

The energy dissipation usually occurs during rock failure, which can demonstrate the meso failure process of rock in a relatively accurate way. Based on the results of conventional triaxial compression experiments on the Jinping marble, a numerical biaxial compression model was established by PFC2D to observe the development of the micro-cracks and energy evolution during the test, and then the laws of crack propagation, energy dissipation and damage evolution were analyzed. The numerical simulation results indicate that both the crack number and the total energy dissipated during the loading process increase with confining pressures, which is basically consistent with the experiment results. Two damage variables were presented in terms of the density from other researchers’ results and energy dissipation from numerical simulation, respectively. The energy-based damage variable varies with axial strain in the shape of “S,” and approaches one more closely than that based on density at the final failure period. The research in the rock failure from the perspective of energy may further understand the mechanical behavior of rocks.

Experimental and analytical characterization of steel shear links for seismic energy dissipation

2018 ◽  
Vol 172 ◽  
pp. 405-418 ◽  
Author(s):  
Iolanda Nuzzo ◽  
Daniele Losanno ◽  
Nicola Caterino ◽  
Giorgio Serino ◽  
Luis M. Bozzo Rotondo
Keyword(s):  
Energy Dissipation ◽  
Seismic Energy ◽  
Analytical Characterization ◽  
Shear Links
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