Isolation Effect Research about RFPS Seismic Isolating System on Bridges

2013 ◽  
Vol 662 ◽  
pp. 683-687
Author(s):  
Hai Bin Chen ◽  
Nan Ge
Keyword(s):  
Vertical Direction ◽  
Time History ◽  
Rolling Friction ◽  
Isolation Effect ◽  
Isolation System ◽  
History Analysis ◽  
Calculation Results ◽  
Internal Forces ◽  
Response Equation ◽  
Method Analysis

A balance equation was established for RFPS which in the general position, it derived from Alembert's principle and Static theory. Then make a bridge structure with RFPS bearings as an example calculated the dynamic response equation of the isolation system that under the action of earthquake. The solving program which based on MATLAB program was presented with Newmark–β time-history analysis method. Analysis and calculation results show that the isolation effect of RFPS bearings was very evident. Make an appropriate selection on slide radius and the rolling friction coefficient values can make the internal forces (shear forces) for piers exhibit a significant reduction to a great extent. Besides, the drift of longitudinal beam in horizontal direction and vertical direction would be both in the reasonable bounds.

Analysis of Earthquake Response on Isolated Building with Limiting Displacement Protective Devices

2010 ◽  
Vol 163-167 ◽  
pp. 4027-4031
Author(s):  
Jin Hui Liu ◽  
Wan Tao Ding
Keyword(s):  
Program Analysis ◽  
Time History ◽  
Fortran Program ◽  
Isolation Effect ◽  
Good Effect ◽  
Earthquake Response ◽  
Isolation System ◽  
Protective Devices ◽  
History Analysis ◽  
Rare Earthquake

Based on isolation theory, time-history analysis on isolation system with limiting displacement protective devices was studied by Fortran program. Isolation effect of non-isolated structure, isolated structure and limit isolated structure were analyzed. Adhesion phenomenon of algorithm is solved by subdividing time steps during program analysis. And it gets good effect. According to comparing with isolation effect of different isolated structure, the result that isolation effect of isolated structure and limit isolated structure is obvious is reward; and limit isolated structure can isolation and prevent large displacement of isolation layers to avoid structure failure under rare earthquake condition. So limit isolated structure plays a double protection for structure.

Seismic performance of Greater Jakarta LRT with added lead rubber bearing using non-linear time history analysis

2021 ◽  
Author(s):  
Iswandi Imran ◽  
Marie Hamidah ◽  
Tri Suryadi ◽  
Hasan Al-Harris ◽  
Syamsul Hidayat
Keyword(s):  
Linear Time ◽  
Time History ◽  
Time History Analysis ◽  
Performance Level ◽  
Structural Performance ◽  
Isolation System ◽  
Rubber Bearing ◽  
Lead Rubber Bearing ◽  
History Analysis ◽  
Seismic System

<p>In order to overcome stringent seismic requirement in the new Greater Jakarta Light Rail Transit Project, a breakthrough seismic system shall be chosen to obtain expected structural performance. This seismic system shall be designed to provide operational performance level after strong earthquake events. To achieve the criteria, seismic isolation system using Lead Rubber Bearings is chosen. With this isolation system, Greater Jakarta LRT has become the first seismically isolated infrastructure and apparently an infrastructure with the largest numbers of LRBs in one single project in Indonesia. More than 10.400 Pcs LRBs are used for the first phase of the construction and the numbers will be certainly increased in the next phase of the construction. To evaluate the structural performance, non-linear time history analysis is used. A total of 3 pair matched ground motions will be used as the input for the response history analysis. The ability of the lead rubber bearing to isolate and dissipate earthquake actions will determine its structural performance level. This will be represented by the nonlinear hysteretic curves obtained throughout the earthquake actions.</p>

A Study on the Restrainer for Isolated Bridge

2011 ◽  
Vol 243-249 ◽  
pp. 5208-5213
Author(s):  
Yong Feng Du ◽  
Xiao Yu Sun
Keyword(s):  
Lateral Displacement ◽  
Time History ◽  
Nonlinear Characteristics ◽  
Isolation System ◽  
Finite Element Software ◽  
Continuous Beam Bridge ◽  
History Analysis ◽  
Isolated Bridge ◽  
Isolated Bridges ◽  
Beam Bridge

As a result of adopting isolated bearings, it is inevitable to increase the lateral displacement of the superstructure and the chance of girder falling. However, the shear keys that just satisfies the structural design is far from meeting the requirements of displacement of isolated bridge restrictions. On account of this, given the nonlinear characteristics of bearings and the restrainer, the authors make the study on the "damping rubber with coupling collar" restrainer, and then establish isolation system model of continuous beam bridge with finite element software named Midas. Meanwhile, the effect of the restrainer on the dynamic response of isolated bridges is presented by time-history analysis, which reveals the great value in the application of limiting displacement of isolated bridge.

Structural Response and Pounding of Andalas University Hospital Building Using New Indonesian Seismic Code SNI 1726-2012

2016 ◽  
Vol 845 ◽  
pp. 274-282
Author(s):  
Fauzan ◽  
Febrin Anas Ismail ◽  
Zev Al Jauhari
Keyword(s):  
Response Spectrum ◽  
Structural Response ◽  
Time History ◽  
Analysis Time ◽  
University Hospital ◽  
Seismic Code ◽  
History Analysis ◽  
Internal Forces ◽  
Hospital Building ◽  
Analytical Result

Keywords: Earthquake, Internal Forces, Displacement, Response Spectrum Analysis, Time History Analysis, PoundingAbstract. Teaching Hospital is an educational facilitiy for students in the Faculty of Medicine and also as a health services for the general public. The hospital building must be built in accordance with earthquake-safe building standards, so that buildings are not damaged in an earthquake. Andalas University Hospital was built at Padang in 2014 which was designed using Indonesian Seismic Code SNI 03-1726-2002 with quakes zone 6. Since 2012, a new Seismic Code, SNI 1726-2012, was issued and all the buildings should be designed by using the new code. Therefore, the authors are interested in analyzing the structural response of the hospital building by using new seismic code SNI 1726-2012. The results, then, were compared with the responses of the structure which calculated by using SNI 03-1726-2002.The results of analysis show that the structural responses in the internal forces and displacement by using SNI 1726-2012 was higher than those using SNI 03-1726-2002. In this study, an analysis of potential Pounding was also conducted by using dynamic analysis Time History method. The analytical result shows that there is no pounding between adjacent buildings at Andalas University Hospital Buildings.

Theoretical Analysis and Application Research on Grid String Branch Structure

2011 ◽  
Vol 243-249 ◽  
pp. 374-378
Author(s):  
Zong Yun Mo ◽  
Xiao Li Liu ◽  
Xue Feng Song
Keyword(s):  
Natural Vibration ◽  
Time History ◽  
Calculation Model ◽  
Structural Vibration ◽  
Application Research ◽  
General Law ◽  
History Analysis ◽  
String Structure ◽  
Internal Forces ◽  
Node Displacement

According to the thought of beam string structure, pre-stressing structure was presented that it was joined by rigid grid and flexible cable by pole support. It was grid string branch structure. A calculation model of string branch grid was founded. Static and dynamic characteristics of the structure that it was acted by different pre-stress value were analyzed. Through the analysis, the structure displacement and internal forces of rod are improved obviously depending on pre-stress value. The pre-stress value is larger, structure displacement and internal forces of rod are lower. Natural vibration characteristics of the structure are almost not changing, while pre-stress value is changing. When the structure is time history analysis, its response curve accords with general law of structural vibration. Node displacement response of up and bottom chord nodes are not occurred retardation effect.

Effect of Friction Bearing Ratio on Isolation Performance and Nonlinear Property in Parallel Composite Isolation System

2013 ◽  
Vol 639-640 ◽  
pp. 896-900
Author(s):  
Ying Yuan ◽  
Ai Hong Zhou ◽  
Yan Li Gao
Keyword(s):  
Base Isolation ◽  
Time History ◽  
Analysis Method ◽  
Isolation System ◽  
Nonlinear Properties ◽  
History Analysis ◽  
Friction Bearing ◽  
Key Factor ◽  
Hysteretic Characteristics ◽  
Isolation Performance

Different friction bearing ratios have effects on the base isolation property of parallel composite isolation system subjected to the seismic excitation. In order to deeply investigate how the friction bearing ratio affect the isolation property, the numerical simulation was carried out by the time-history analysis method, in which the seismic response of parallel composite isolation system with different friction bearing ratios under different acceleration peak values were calculated. Then, the effects of different friction bearing ratios on the base maximum shear coefficients and base maximum displacements; the hysteretic characteristics and nonlinear properties were analyzed and discussed. The results show that, for the parallel composite isolation system, friction bearing ratio is a key factor affecting the isolation property and the nonlinear properties are tightly related to the friction bearing ratio and acceleration peak values.

Research about FPS Seismic Isolating System on Bridges

2012 ◽  
Vol 256-259 ◽  
pp. 1618-1622
Author(s):  
Nan Ge ◽  
Hai Bin Chen ◽  
Pan Jiang
Keyword(s):  
Friction Factor ◽  
Seismic Isolation ◽  
Lagrange Equation ◽  
Vertical Direction ◽  
Shear Forces ◽  
Isolation System ◽  
Slipping Friction ◽  
Continuous Beam Bridge ◽  
Internal Forces ◽  
Beam Bridge

A numerical model was established for a continuous beam bridge with FPS bearings. It started from Lagrange equation in dynamic mechanics. The software for its numerical solution was presented with Newmark-β method. Computation results show that efficiency of the seismic isolation system is closely related to slipping friction factor on the contacting surface and slide radius. The internal forces (shear forces) for piers exhibit a significant reduction under an optimum combination of friction factor and slide radius. For friction factor being in the range of 0.1-0.2 and slide radius 1.5m, the shear force could be decreased by more than 50%, and the drift of beam would be less than 2cm in horizontal direction and less than 0.1cm in vertical direction respectively.

Study on the Influence of Infilled Wall on the Seismic Performance of Bottom Frame Structure

2014 ◽  
Vol 1065-1069 ◽  
pp. 1249-1253
Author(s):  
Hong Yu Deng ◽  
Bai Tao Sun
Keyword(s):  
Seismic Design ◽  
Time History ◽  
Frame Structure ◽  
Torsional Response ◽  
Finite Element Software ◽  
Content Ratio ◽  
History Analysis ◽  
Calculation Results ◽  
Current Code ◽  
Bottom Frame

In the current code of seismic design in our country,infilled wall are considered as non-structural component and do not participate in the seismic checking. In the bottom frame structure, the infilled wall of the first floor often change the number and position for using function at random,this will have unfavorable impact on the main structure. In this paper, a serious damaged bottom frame structure in high intensity area in Wenchuan earthquake is taken as the research object,and 3 comparative calculation models are designed, elasto-plastic time-history analysis is carried out on the use of ABAQUS finite element software. The calculation results show that: the first layer containing infilled with high wall content ratio will reduce the first floor damage, but causing the weak layer of the overall structure transfer from the bottom to transitional masonry story which aggravates damage, at the same time, an appropriate increase in wall content ratio can reduce the torsional response at a certain extent; nonuniform arrangement infilled wall has little effect on the floor deformation and resistance, but it will increase the torsional response of the whole structure.

scholarly journals Seismic analysis on cross joint of utility tunnel

2019 ◽  
Vol 295 ◽  
pp. 03004
Author(s):  
Chang-xiang Wang ◽  
Meijing Wang ◽  
Jianwen Liang
Keyword(s):  
Seismic Analysis ◽  
Time History ◽  
Reference Value ◽  
Internal Force ◽  
Analysis Model ◽  
Finite Element Software ◽  
History Analysis ◽  
Internal Forces ◽  
Utility Tunnel ◽  
The Cross

The finite element software ABAQUS is used to establish the seismic time-history analysis model of the utility tunnel joints. The viscoelastic boundary is employed to input the seismic wave through the equivalent nodal force. Considering the nonlinearity of the soil and concrete materials, the internal force of the cross-shaped utility tunnel is calculated, and the influence effect and influence range of the cross joints of the utility tunnel are also studied. Studies have shown that the internal forces near the cross joints increase significantly. The research has certain reference value for the seismic design of the cross joints in utility tunnel.

Analysis of Linear Viscous Damper Parameters and Shock Absorption for Long-Span Cable-Stayed Bridge

2011 ◽  
Vol 243-249 ◽  
pp. 3858-3862
Author(s):  
Hong Yu Jia ◽  
Shi Xiong Zheng ◽  
Ming Qiang Xia ◽  
Lei Yang
Keyword(s):  
Vertical Direction ◽  
Time History ◽  
Longitudinal Direction ◽  
Relative Displacement ◽  
Sensitivity Study ◽  
Viscous Dampers ◽  
Long Span ◽  
Behavior Study ◽  
History Analysis ◽  
Dynamic Time

The seismic behavior study of Fengdu Bridge will be conducted on a parameter of damping coefficient C of linear viscous dampers through linear dynamic time-history analysis. Simultaneously, the results are compared with the seismic response without viscous dampers. The parameter sensitivity study indicates that setting damper in longitudinal direction of bridge can reduce the relative displacement of key positions and the response of the bridge, the beneficial effect of the isolation in the longitudinal direction, but important amplification occurs in the vertical direction for relatively high frequency components. Moreover, the reference of application of linear viscous dampers will be provided for similar projects.

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