Increasing Seismic Energy Dissipation of Steel Moment Frames Using Reduced Web Section (RWS) Connection

2016 ◽  
Vol 21 (7) ◽  
pp. 1090-1112 ◽  
Author(s):  
Saeed Erfani ◽  
Vahid Akrami
Keyword(s):  
Energy Dissipation ◽  
Seismic Energy ◽  
Moment Frames ◽  
Steel Moment Frames

Study on Seismic Performance of a New Type Energy Dissipation Steel Moment Frames

2011 ◽  
Vol 94-96 ◽  
pp. 764-770
Author(s):  
Bing Guo ◽  
Jin Tao Wang ◽  
Tian Liang ◽  
Zhen Bao
Keyword(s):  
Energy Dissipation ◽  
Axial Stress ◽  
Design Criterion ◽  
Moment Frames ◽  
Steel Moment Frames ◽  
Web Openings ◽  
Web Opening ◽  
Open Circular ◽  
Circular Holes ◽  
New Type

Open circular holes with a certain size in beam web at 1/6 span is a new method to improve the seismic behavior of steel moment frames. Based on the results of elasticity theory, analytical model of frame with opening web is proposed, and analysis and verification with nonlinear finite element method (FEM) are conducted. Results show that, beam with opening web at 1/6 span can significantly reduce the axial stress of beam flange near the beam-column connections. It is helpful to achieve the design criterion of strong connection and weak member, and also to simplify the connection construction. If the diameter of web opening is appropriate, beam plastic hinges can move inward to beam section at opening web, and has little effect on bearing capacity, stiffness, energy dissipation capacity and ductility of frames. The method of web openings and the size range are presented at the end of this paper.

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.

Seismic Energy Demands in Steel Moment Frames

2016 ◽  
Vol 847 ◽  
pp. 210-221
Author(s):  
Selcuk Dogru ◽  
Bora Aksar ◽  
Bulent Akbas ◽  
Jay Shen ◽  
Onur Seker ◽  
...  
Keyword(s):  
Ground Motion ◽  
Structural Damage ◽  
Seismic Energy ◽  
Degree Of Freedom ◽  
Nonlinear Time History Analysis ◽  
Input Energy ◽  
Moment Frames ◽  
Steel Moment Frames ◽  
Energy Parameters ◽  
Energy Demands

This study presents an energy approach to the seismic evaluation of steel moment resisting frames. A structure subjected to strong ground motion is supposed that it shows nonlinear behavior. Energy parameters is a way to specify the structural damage. Input energy is depend on the characteristics of the structure and ground motion. Structural design can be defined as the equilibration of the input energy and the energy dissipation capacity of the structure. Structures subjected to eartquake are supposed to dissipate all the input energy. Studies based on energy concepts are usually applied to single-degree-of-freedom (SDOF) system. For multi-degree-of-freedom (MDOF), more researches and new simpler methodologies are still needed in performance based evaluation including energy parameters. In this study , low – medium and high rise steel moment frames and will be studied in linear and nonlinear time history analysis. The results obtained from these analysis are reviewed for seismic energy demands.

Effects of Fling Step and Forward Directivity on Seismic Response of Buildings

2006 ◽  
Vol 22 (2) ◽  
pp. 367-390 ◽  
Author(s):  
Erol Kalkan ◽  
Sashi K. Kunnath
Keyword(s):  
Seismic Response ◽  
Ground Motions ◽  
High Amplitude ◽  
Moment Frames ◽  
Steel Moment Frames ◽  
Damage Potential ◽  
Near Fault ◽  
Forward Directivity ◽  
Fling Step ◽  
Far Fault

This paper investigates the consequences of well-known characteristics of near-fault ground motions on the seismic response of steel moment frames. Additionally, idealized pulses are utilized in a separate study to gain further insight into the effects of high-amplitude pulses on structural demands. Simple input pulses were also synthesized to simulate artificial fling-step effects in ground motions originally having forward directivity. Findings from the study reveal that median maximum demands and the dispersion in the peak values were higher for near-fault records than far-fault motions. The arrival of the velocity pulse in a near-fault record causes the structure to dissipate considerable input energy in relatively few plastic cycles, whereas cumulative effects from increased cyclic demands are more pronounced in far-fault records. For pulse-type input, the maximum demand is a function of the ratio of the pulse period to the fundamental period of the structure. Records with fling effects were found to excite systems primarily in their fundamental mode while waveforms with forward directivity in the absence of fling caused higher modes to be activated. It is concluded that the acceleration and velocity spectra, when examined collectively, can be utilized to reasonably assess the damage potential of near-fault records.

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