Viscoelastic Coupling Dampers for Enhanced Multiple Seismic Hazard Level Performance of High-Rise Buildings

2018 ◽  
Vol 34 (4) ◽  
pp. 1847-1867 ◽  
Author(s):  
Renée MacKay-Lyons ◽  
Constantin Christopoulos ◽  
Michael Montgomery
Keyword(s):  
Seismic Hazard ◽  
Structural Damage ◽  
Time History ◽  
Coupled System ◽  
Nonlinear Time History Analysis ◽  
Coupling Beams ◽  
Restoring Force ◽  
High Rise ◽  
Amplitude Maximum ◽  
Hazard Level

Viscoelastic coupling dampers (VCDs) are installed in lieu of traditional reinforced concrete (RC) coupling beams in high-rise buildings to provide distributed supplemental damping for all dynamic loading conditions without affecting the architectural layout. When distributed effectively over the height of the building, VCDs provide viscous damping in all lateral modes of vibration and an elastic restoring force that enhances the lateral stiffness of the coupled system. In this paper, a first extensive numerical case study is carried out to compare the seismic performance of a conventional coupled shear wall high-rise building to a high damping alternate of the same design in which VCDs replace all diagonal RC beams in the core to enhance its seismic resilience. The added damping from VCDs is intended to reduce the peak responses under low amplitude earthquakes, but for larger amplitude maximum credible earthquakes, the peak responses are similar; however, structural damage is greatly reduced. Three seismic hazard levels were investigated, and the results indicate that the use of VCDs reduces peak floor accelerations, story drifts, and story shears over all seismic intensities. Nonlinear time-history analysis results also highlighted the improved resilience of the VCD structure at the maximum credible seismic hazard level where the use of VCDs eliminated all damage to coupling beams that would otherwise require repair over most of the height of the building.

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.

DRIFT DEMANDS OF LOW-DUCTILE MOMENT RESISTANCE FRAMES (MRF) UNDER FAR FIELD EARTHQUAKE EXCITATIONS

2016 ◽  
Vol 78 (6) ◽  
Author(s):  
Mohammadreza Vafaei ◽  
Sophia C. Alih ◽  
Qotrunnada Abdul Rahman
Keyword(s):  
Structural Damage ◽  
Load Capacity ◽  
Time History ◽  
Seismic Excitation ◽  
Nonlinear Time History Analysis ◽  
Soft Story ◽  
History Analysis ◽  
The Stability ◽  
Nonlinear Time History ◽  
Strong Ground

Most of current Malaysian’s structures have not been designed with consideration of seismic excitation effect. Tremors that have been recorded locally due to active local faults and earthquake events in neighboring countries have raised the question about the level of safety of these structures.  The effects of seismic excitation on the stability and fragility of the structures are now being concerned by most researchers and engineers in order to mitigate structural damage and societal losses. This study focuses on the seismic performance of Reinforced Concrete (RC) Moment Resistance Frames (MRF) in Malaysia which has been only designed to resist gravity and wind loads effects. An ordinary building layout with different number of stories (four, seven, and 10 stories) is selected in a way that can represent the potential of soft-story phenomenon in RC buildings in Malaysia. Such structures have limited lateral load capacity to withstand against strong ground motion. Nonlinear time history analysis is used to analyze the structures using seven different ground motions scaled to 0.05g, 0.1g and 0.15g to suit Malaysian condition. The outcomes of this study illustrate the vulnerability of the typical RC, MRF structures in Malaysia to soft-story phenomenon and clarify on the necessity of seismic retrofit for such structures.  

Seismic Behavior of Super High-Rise Frame-Core Wall Structure

2012 ◽  
Vol 226-228 ◽  
pp. 967-971
Author(s):  
Ji Xing Yuan ◽  
Qing Zhang
Keyword(s):  
Failure Mode ◽  
Seismic Performance ◽  
Time History ◽  
Frame Structure ◽  
Wall Structure ◽  
Coupling Beams ◽  
High Rise ◽  
Seismic Shear ◽  
Earthquake Force ◽  
Dynamic Time

In this paper a super high-rise frame-core wall as an example, It was analyzed the frame-core wall structure system under action of earthquake force features, set reasonable seismic performance objectives, analysis the structure reasonable failure mode, made it have enough bearing capacity and ductility for a reasonable design of frame and coupling wall-beam, could make the frame-core wall structure with multiple seismic fortification lines, improve the seismic performance of the frame-core wall structure. Finally, the action of earthquake deformation and seismic shear force distribution was analyzed through the elastic dynamic time-history analysis. After a reasonable optimization analysis showed: Frame-core wall structure could have three seismic fortification lines: coupling beams, core wall, frame structure, and had enough energy dissipation ability at the same time, could form the rational failure mode, improved the seismic performance of the structure.

Study on Evaluation Method of High-Rise Building Performance by Equivalent Single Degree of Freedom System

2008 ◽  
Vol 400-402 ◽  
pp. 599-605
Author(s):  
Xing Wen Liang ◽  
Li Xin ◽  
Yue Sheng Tong
Keyword(s):  
Evaluation Method ◽  
Demand Curve ◽  
Time History ◽  
Degree Of Freedom ◽  
Nonlinear Time History Analysis ◽  
Elastic Displacement ◽  
Natural Period ◽  
Single Degree Of Freedom ◽  
High Rise ◽  
Single Degree

A performance evaluation method of high-rise buildings is presented, by means of capacity spectra method which allows for higher mode effects. The multi-degree-of-freedom system (MDOF) of each mode is transformed into equivalent single-degree-of-freedom (ESDOF) system, and the ESDOF system is supposed to be elastic perfectly plastic. In elastic range, the equivalent displacement of ESDOF system for each mode is deduced by displacement response spectra based on the natural period, and the structural lateral elastic displacement of each mode could be determined by the corresponding equivalent displacement and mode shape. In inelastic range, according to capacity spectra method, the relationships among demand curve, capacity curve and ductility coefficient are built. The structural performance under moderate or major earthquake is determined by iteration method. The paper illustrates the application of the proposed procedure with an example and attempts to prove its feasibility by nonlinear time-history analysis.

Seismic performance evaluation of coupled wall system with novel replaceable steel truss coupling beams

2018 ◽  
Vol 22 (6) ◽  
pp. 1284-1296 ◽  
Author(s):  
Yong Li ◽  
Ye Liu ◽  
Shaoping Meng
Keyword(s):  
Reinforced Concrete ◽  
Seismic Response ◽  
Time History ◽  
Nonlinear Time History Analysis ◽  
Coupling Beam ◽  
Coupling Beams ◽  
Coupled Wall ◽  
Steel Truss ◽  
Seismic Loadings ◽  
Wall System

Coupled wall systems are often used in high-rise buildings in zone of high seismic risk to provide lateral resistance to earthquake loading. Once damaged, reinforced concrete coupling beams are costly and time-consuming to repair post-earthquake. To enhance the seismic resilience for coupled wall structures, a novel replaceable steel truss coupling beam is first introduced. The proposed replaceable steel truss coupling beam consists of chord members at the top and bottom, respectively, and two buckling-restrained energy dissipaters are employed in the diagonal direction. The energy dissipaters can yield first before the wall piers and dissipate large amounts of energy to protect the main structure under seismic loadings. In addition, the energy dissipaters can be easily installed and post-earthquake repaired through pin connection with the chord members. This article mainly focused on the numerical and theoretical analyses of the proposed replaceable steel truss coupling beam, and nonlinear analytical models were developed in PERFORM-3D. An 11-story prototype structure was designed per Chinese code. The seismic response of hybrid coupled wall system with replaceable steel truss coupling beams was evaluated using nonlinear time history analysis and compared with the response of reinforced concrete coupled wall system with reinforced concrete coupling beams under seismic loadings. Results show that the proposed replaceable steel truss coupling beam leads to a good seismic response with reduced interstory drifts of the systems and rotational demand in the beams and wall piers due to a large energy dissipation capacity and overstrength.

Seismic Response of Bridge Isolated with Friction Pendulum Systems

2012 ◽  
Vol 256-259 ◽  
pp. 2122-2126
Author(s):  
Chang Feng Wang ◽  
Chun Lin Zhu
Keyword(s):  
Seismic Response ◽  
Time History ◽  
Nonlinear Time History Analysis ◽  
Restoring Force ◽  
Simply Supported ◽  
Long Span ◽  
Steel Truss ◽  
Reduction Effect ◽  
Nonlinear Time History ◽  
Friction Pendulum

Friction pendulum systems are sliding bearing that make use of a spherical concave surface to provide a restoring force and friction force to dissipate earthquakes energy. Seismic response reduction effect of some tall pier and long span simply-supported steel truss girders with FPS is researched by using nonlinear time history analysis method. The results show that seismic response reduction effect is evident for the moment at the bottom of pier and displacement at the top of pier for the tall pier and long span simply-supported steel truss girders.

scholarly journals Seismic assessment of tall RC frames with hybrid friction damper and SMA designed by PBPD method

2021 ◽  
Vol 37 (1) ◽  
Author(s):  
F. Norouzi ◽  
H. Nasebaradi ◽  
M. Jamshidi
Keyword(s):  
Design Method ◽  
Time History ◽  
Hysteretic Behavior ◽  
Nonlinear Time History Analysis ◽  
Friction Damper ◽  
High Rise ◽  
Rc Frames ◽  
Lateral Strength ◽  
Residual Deformations ◽  
Nonlinear Time History

In this study, a new lateral load resisting system for high-rise (Reinforced Concrete) RC frames is proposed, which includes friction damper-superelastic SMA wires. The proposed SMA-friction damper can not only regulate the mechanism of frictional energy dissipation components with its self-centering SMA wires according to the design method based on the proposed performance, which is able to provide a hysteretic behavior and high self-centering capacity with the lowest SMA consumption but also has some advantages such as simple configuration and economic application. In this paper, two high-rise 18 and 22-story RC frames were designed in two design modes of common and with the proposed damper. The nonlinear time history analysis subjected to 10 far-field earthquakes performed in Opensees software. The results of the analyses showed that using the proposed SMA-friction damper, in addition to the effective increase in ductility, lateral stiffness and lateral strength, provided an excellent self-centering capacity, which resulted to the significant reduction in the maximum drift and the residual deformations in the structure.

scholarly journals Effect of Masonry Infill Walls with Openings on Nonlinear Response of Steel Frames

2021 ◽  
Vol 7 (2) ◽  
pp. 278-291
Author(s):  
Athmane Rahem ◽  
Yahiaoui Djarir ◽  
Lahbari Noureddineb ◽  
Bouzid Tayeb
Keyword(s):  
Structural Damage ◽  
Time History ◽  
Time History Analysis ◽  
Steel Frame ◽  
Nonlinear Time History Analysis ◽  
Infill Walls ◽  
Masonry Infill ◽  
History Analysis ◽  
Nonlinear Static ◽  
Nonlinear Time History

The infill walls are usually considered as nonstructural elements and, thus, are not taken into account in analytical models. However, numerous researches have shown that they can significantly affect the seismic response of the structures. The aim of the present study is to examine the role of masonry infill on the damage response of steel frame without and with various types of openings systems subjected to nonlinear static analysis and nonlinear time history analysis. For the purposes of the above investigation, a comprehensive assessment is conducted using twelve typical types of steel frame without masonry, with full masonry and with different heights and widths of openings. The results revealed that the influence of the successive earthquake phenomenon on the structural damage is larger for the infill buildings compared to the bare structures. Furthermore, when buildings with masonry infill are analyzed for seismic sequences, it is of great importance to account for the orientation of the seismic motion. The nonlinear static response indicated that the opening area has an influence on the maximal strength, the ductility and the initial rigidity of these frames. But the shape of the opening will not influence the global behavior. Then, the nonlinear time history analysis indicates that the global displacement is greatly decreased and even the behavior of the curve is affected by the earthquake intensity when opening is considered. Doi: 10.28991/cej-2021-03091653 Full Text: PDF

scholarly journals Mechanical Performance and Design Method of Improved Lead Shear Damper with Long Stroke

2018 ◽  
Vol 2018 ◽  
pp. 1-18
Author(s):  
Baoshun Wang ◽  
Weiming Yan ◽  
Haoxiang He
Keyword(s):  
Mechanical Performance ◽  
Time History ◽  
Constitutive Law ◽  
Nonlinear Time History Analysis ◽  
Damping Force ◽  
Rigid Plastic ◽  
Element Analysis ◽  
High Rise ◽  
Long Period ◽  
Long Stroke

The paper presents experimental study on an improved plate lead shear damper with long stroke (ILSD-LS) which is developed to meet the engineering requirements for high-rise structures with long periods subjected to the long-period earthquakes. Finite element analysis is also carried out to investigate the proposed damper. Based on the ideal rigid-plastic constitutive law of lead, a mechanical model of the ILSD-LS is established. Compared with ordinary dampers, ILSD-LS has better damping force, energy dissipation capacity, and stability according to the results of simulation and experiments. The method of calculating damping force is reasonable and accurate. In order to verify the damping effect of ILSD-LS for the structures with long periods under long-period ground motions, the nonlinear time history analysis of a typical high-rise structure with ILSD-LS is carried out. The numerical results indicate that the seismic responses of the high-rise structure with ILSD-LS are significantly reduced when subjected to long-period ground motion.

scholarly journals Evaluation of Seismic Performance of Improved Rocking Concentrically Braced-frames with Zipper Columns

2020 ◽  
Author(s):  
Nasim Irani Sarand ◽  
Abdolrahim Jalali
Keyword(s):  
Time History ◽  
Nonlinear Time History Analysis ◽  
Braced Frames ◽  
Concentrically Braced Frames ◽  
Restoring Force ◽  
Braced Frame ◽  
Concentrically Braced Frame ◽  
Concentrically Braced ◽  
Rocking Behavior ◽  
Post Tensioned

Concentrically braced frames (CBFs) as one of well-known stiff and common lateral force resisting systems often show limited ductility capacity under severe earthquakes. This study proposes rocking zipper braced frame (RZBF) to improve the drift capacity of CBFs which is based on combination of rocking behavior and zipper columns. In the RZBF system, rocking behavior permit the braced frame to uplift during the earthquake and then restoring force induced through post-tensioned bars self-center the frame to its initial state. Also, zipper columns can decrease the concentration of damage by distributing the unbalance force at the mid bay over the frame’s height. To assess the performance of RZBF, a comparison study is carried out considering CBF, rocking concentrically braced frame, zipper braced frame and RZBF. For this purpose, some frames structures are designed and nonlinear time history analysis conduct under a set of earthquake records. Seismic responses such as roof drift ratio, gap opening at the column-base interface, forces of top story braces and post-tensioned bars are taken into consideration. The results show that the proposed RZBF has better performance among the others and zipper columns can improve the behavior of rocking systems.

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