scholarly journals THE IMPACT OF APPLYING BASE ISOLATOR IN HOSPITAL BUILDING

2014 ◽  
Vol 10 (2) ◽  
pp. 9
Author(s):  
Predaricka Deastra ◽  
Jati Sunaryati ◽  
Riza Aryanti
Keyword(s):  
Seismic Performance ◽  
Seismic Isolation ◽  
Relative Displacement ◽  
Internal Force ◽  
Isolation System ◽  
Vibration Period ◽  
Final Project ◽  
The Difference ◽  
Earthquake Zone ◽  
The Impact

Due to Indonesia’s location in the earthquake zone, it is necessary for civil engineers in Indonesia to study seismic performance of a building, which is strongly related to the structure of the building itself. Buildings equipped with vibration damping structures, known as an isolation system, will have a different seismic behavior than if it did not have one. This is due to the impact of an earthquake dampening vibration isolator. This final project analyzes the difference between seismic performance of a building using a seismic isolation system and ones without. The conclusion of this final project shows that the isolation system will decrease the internal force of a structure element by about 57.71% for axial force, 84.10% for shear, and 85.75% for moment. The application of an isolation system will also decrease the relative displacement by about 74,28% and extended structure vibration period by about 171.17 %. Keywords: earthquake, seismic performance, isolation system.

Research on Seismic Performance for Steel Box Arch Bridge Scheme of Xiazhang Sea-Crossing Bridge

2011 ◽  
Vol 243-249 ◽  
pp. 1917-1921
Author(s):  
Bin Yan ◽  
Yun Cheng Feng
Keyword(s):  
Seismic Response ◽  
Seismic Performance ◽  
Seismic Isolation ◽  
Parameter Analysis ◽  
Isolation System ◽  
Arch Bridge ◽  
Constraint System ◽  
Earthquake Zone ◽  
Bearing System ◽  
Seismic System

Xia-Zhang Sea-crossing Bridge was located in earthquake zone, the design of which was governed by earthquake. Based on seismic-isolation principles, seismic-isolation bearing system and damper system were studied to find out the effect of each seismic-isolation system on seismic performance of steel box arch bridge scheme. Seismic response could be effectively reduced by damper system, without changing the original constraint system of structure, which was recommended for longitudinal seismic system. Two liquid viscous dampers were suggested installing between pier and girder after parameter analysis, with damping coefficient of 4000kN/ (m/s) 1.0 and damping index of 1.0.

scholarly journals Evaluation of optimal FVDs for inter-storey isolation systems based on surrogate performance models

2021 ◽  
Author(s):  
Marco Donà ◽  
Enrico Bernardi ◽  
Alberto Zonta ◽  
Ping Tan ◽  
Fulin Zhou
Keyword(s):  
Seismic Performance ◽  
Seismic Isolation ◽  
Prediction Models ◽  
Relative Displacement ◽  
Isolation System ◽  
General Validity ◽  
Fluid Viscous Dampers ◽  
Wide Range ◽  
And Performance ◽  
Isolation Systems

AbstractInter-storey seismic isolation is increasingly gaining attention. One of the main related issues is the need to limit the relative displacement between substructure and superstructure, while maintaining a good seismic performance of the superstructure. As shown in some studies, fluid viscous dampers (FVDs) mounted in isolation systems are effective in reducing isolator deflection but can be harmful by amplifying inter-storey drifts and floor accelerations. Additionally, the effectiveness of FVDs for inter-storey applications was investigated only recently, and specific approaches for their optimisation and performance evaluation are missing. Therefore, this paper proposes a method for the optimal multi-objective design of FVDs, based on the definition of appropriate surrogate response models, which allows for rationally comparing the FVD effects for a wide range of dampers and structures. In particular, the optimal FVD parameters are provided in a dimensionless form, so that they can be predicted by design equations of general validity within the range of the structures analysed. This method is applied to a stock of regular structures with various vibration periods of superstructure, isolation and substructure, examining a linear and a non-linear isolation system and a set of natural records, in order to comprehensively assess the effects of FVDs and their non-linearity on the seismic performance of these structures. Finally, prediction models of optimal FVD parameters are provided based on the results obtained and are applied to three case studies as an example.

scholarly journals Comparative analysis of conventional and new seismically isolated structure

2021 ◽  
Vol 64 (3) ◽  
pp. 185-193
Author(s):  
Jelena Ristić ◽  
Miloš Vučinić ◽  
Danilo Ristić ◽  
Milutin Vučinić
Keyword(s):  
Seismic Isolation ◽  
Low Cost ◽  
Seismic Energy ◽  
Seismic Excitation ◽  
Isolation System ◽  
Vibration Period ◽  
International Projects ◽  
Dominant Period ◽  
Efficient Protection ◽  
Seismically Isolated

Extensive analytical and experimental research has been done by the authors directed to mitigation of the effects of earthquakes on structures. The research results mainly represent parts of the realized several related international projects. A selected part of the analytical studies directed to comparison between conventional and seismically isolated frame structures is presented in this paper. The responses of the applied newely developed advanced seismic isolation system HC-RMS-GOSEB to the simulated input excitation of three representative earthquakes of intensity 0.50g, have shown that it is very effective for construction of vibro-isolated and seismically resistant buildings, providing activated multistage seismic response and globally optimized seismic energy balance. Its application achieves an increase in the vibration period of the structure, far enough from the dominant period of seismic excitation. The results of the research confirm that this system is a potential solution for achieving low-cost and highly efficient protection of buildings.

Analysis of Vibration Isolator’s Anti-Seismic Performance in Porcelain SF6 High Voltage Circuit Breaker

2013 ◽  
Vol 448-453 ◽  
pp. 2045-2048
Author(s):  
Yan Zhong Ju ◽  
Xin Lei Wu
Keyword(s):  
Seismic Performance ◽  
High Voltage ◽  
Seismic Isolation ◽  
Circuit Breaker ◽  
Isolation System ◽  
High Voltage Circuit Breaker ◽  
Rubber Bearing ◽  
Laminated Rubber Bearing ◽  
Sf6 Circuit Breaker ◽  
Isolation Device

Choosing LW15-550Y porcelain high voltage SF6 circuit breaker as the research subject, we designed the lead laminated rubber bearing (LRB) seismic isolation device for LW15-550Y circuit breaker. We finally gets the results that the LRB isolation system increases the flexibility of the breaker structure and improves the seismic performance of the high voltage circuit breaker structure.

Study of Parameters Optimization on Seismic Isolated Railway Bridges

2011 ◽  
Vol 50-51 ◽  
pp. 135-139
Author(s):  
Tie Yi Zhong ◽  
Chao Yi Xia ◽  
Feng Li Yang
Keyword(s):  
Optimal Design ◽  
Optimization Design ◽  
Seismic Isolation ◽  
Optimization Method ◽  
Relative Displacement ◽  
Parameters Optimization ◽  
Design Parameters ◽  
Isolation System ◽  
Railway Bridges ◽  
Design Variables

Based on optimization theories, considering soil-structure interaction and running safety, the optimal design model of the seismic isolation system with lead-rubber bearings (LRB) for a simply supported railway beam bridge is established by using the first order optimization method in ANSYS, which the parameters of the isolation bearing are taken as design variables and the maximum moments at the bottom of bridge piers are taken as objective functions. The optimal calculations are carried out under the excitation of three practical earthquake waves respectively. The research results show that the ratio of the stiffness after yielding to the stiffness before yielding has important effect on the structural seismic responses. Through the optimal analysis of isolated bridge system, the optimal design parameters of isolation bearing can be determined properly, and the seismic forces can be reduced maximally as meeting with the limits of relative displacement between pier top and beam, which provides efficient paths and beneficial references for dynamic optimization design of seismic isolated bridges.

scholarly journals Research on Base Isolation for Seismic Retrofitting of Adjacent Structures Connected with a Large Floor

2017 ◽  
Vol 11 (1) ◽  
pp. 980-991
Author(s):  
Kai Chen ◽  
Zhiwei Miao ◽  
Aiqun Li
Keyword(s):  
Seismic Isolation ◽  
Base Isolation ◽  
Time History ◽  
Reference Value ◽  
Relative Displacement ◽  
Seismic Retrofitting ◽  
Fundamental Vibration ◽  
Vibration Period ◽  
Adjacent Structures ◽  
Tower Structure

Introduction: Seismic isolation has been proven to be an efficient approach to seismic retrofitting of structures based on the concept of reducing the seismic forces by lengthening the structural fundamental vibration period. However, superstructures may collide with each other under seismic excitation as the top displacement increases in the case of base-isolated adjacent structures. The relative displacement of top floors of superstructures is decreased more effectively by connecting the isolation layer of adjacent structures with a large floor, compared with the method to increase the width of seismic joint by using building monolithic movement technology. A specific engineering of base isolation for retrofitting of existing adjacent frame structures is studied in this paper. Methods: Seismic response was evaluated for the structures in different cases by time-history analysis. Parametric studies are performed in order to achieve the laws of top displacement difference of superstructures influenced by the change of dynamic characteristic of towers in the case of base-isolated multi-tower structure with a large floor. Results and Conclusion: The results of extensive numerical analysis verify the effectiveness of isolation with a large floor in minimizing the forces from earthquake and protecting the top story from crashing into each other, which has important reference value for application of retrofitting with isolation technology on adjacent reinforced concreted frames.

scholarly journals Comparative Study Of Structure Response Isolated Base And Not Isolated Base on IHF School Cimanggis

2020 ◽  
Vol 2 (2) ◽  
pp. 106-118
Author(s):  
Agyanata Tua Munthe ◽  
M Iksan
Keyword(s):  
Shear Force ◽  
Seismic Isolation ◽  
Base Isolation ◽  
Vibration Period ◽  
Heritage Foundation ◽  
Fixed Base ◽  
Technological Developments ◽  
The Moment ◽  
Response Method ◽  
The Impact

Along with technological developments in the field of civil engineering, various systems are used to reduce the impact of earthquakes on the structure. One system that has long been developed is a passive prevention system consisting of seismic isolation. Buildings that use seismic dumper are expected to fail structure when an earthquake occurs. This study discusses the comparison of internal forces in buildings using base isolation and without base isolation. The building which is the case study is the Indonesian Heritage Foundation school building in Cimanggis. The analysis uses the 2016 ETABS program. Earthquake analysis uses the Spectrum Response method. From the research results, it is known that the building which was installed with an insulator shakes the structure to 1,344 seconds. The vibration period of the structure increased 41% from the vibration period of the structure which still used a fixed base of 0.796 seconds. Seen from the intersection between floors the maximum direction of X can be reduced by 15.4% by installing an insulator. The same thing happened to the maximum inter-floor deviation for the Y direction deviation is muted by 27.75%. Base isolation installation reduces the moment in a column by 36% in the earthquake X direction and 61% in the earthquake Y direction. For column shear force is reduced by 58% in the earthquake X direction and 75% in the earthquake Y direction. Base isolation can reduce basic shear force in buildings by 24.49% in the X direction of the building and 22.24% in the Y direction.

Study on a Roller-Footing Isolated Single-Pier System

2012 ◽  
Vol 204-208 ◽  
pp. 2658-2661 ◽  
Author(s):  
Biao Wei ◽  
Shan Shan Li
Keyword(s):  
Seismic Performance ◽  
Time History ◽  
Internal Force ◽  
Nonlinear Time History Analysis ◽  
Isolation System ◽  
History Analysis ◽  
Object Of Study ◽  
Design Earthquake ◽  
Nonlinear Time History ◽  
Rolling Balls

As to improve bridges’ seismic performance, horizontal earthquake was isolated at the bottom of piers. With one pier system as the object of study, adopting nonlinear time history analysis analyzed the un-isolation system, the traditional isolation system and the new isolation system’s seismic performance especially when the actual earthquake was different from the design earthquake, in which the new isolation system was based on rolling balls. Results shows, as for the new isolation system, the internal force is independent of earthquake accelerations and earthquake periods, therefore, sympathetic vibration will not exist, and the internal force is always too small to destroy the system.

Analysis on Seismic Pounding of Curved Bridge

2011 ◽  
Vol 90-93 ◽  
pp. 800-804
Author(s):  
Qiang Xu ◽  
Xing Jun Qi
Keyword(s):  
Three Dimensional ◽  
Time History ◽  
Bending Moment ◽  
Relative Displacement ◽  
Internal Force ◽  
Curved Bridge ◽  
Reference Base ◽  
History Analysis ◽  
Seismic Pounding ◽  
The Impact

Based on the impact phenomenon between the end of the beam and the bridge abutment of the curved continuous bridge during earthquakes, a spatial finite element calculating model with collision element is presented. The law of collision is studied by the nonlinear contact time history analysis method under two three-dimensional ground motions. The variation laws of relative displacement and the internal force at the bottoms of piers are researched. In addition the changing of displacement and internal force at the end diaphragm are studied. The results show that the pounding action can easily lead to significant collision forces between the end beam and the abutment of the curved bridge which increases the axial force of girder evidently. The collision forces and longitudinal displacements from the inner to outer of the diaphragm generally are showed by an increasing trend, and the pounding action is more fierce under Elcentro ground motion than that under Tianjin ground motion.There is no relative displacement of consolided pier, bending moment and shear force of the consolided pier are greater than that of the mobile pier.The conclusions from the present study may serve as a reference base for seismic design of continuous curved bridges.

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