Optimum Design of the Control Devices for the Adjacent Structures under Earthquake Excitation

2005 ◽  
Author(s):  
Jun Teng ◽  
Hongjun Liu
Keyword(s):  
Optimum Design ◽  
Earthquake Excitation ◽  
Adjacent Structures ◽  
Control Devices

Connecting Parameter Study on Adjacent Structures Linked by Dampers

2011 ◽  
Vol 243-249 ◽  
pp. 3832-3838
Author(s):  
Huang Sheng Sun ◽  
Li Nuo Cheng
Keyword(s):  
Damping Ratio ◽  
Structural Vibration ◽  
Parameter Study ◽  
Optimal Parameters ◽  
Seismic Responses ◽  
Earthquake Excitation ◽  
Power Spectral ◽  
Adjacent Structures ◽  
Distribution Of Power ◽  
Seismic Mitigation

In order to research the optimal parameters of dampers linking adjacent structures for seismic mitigation, two SDOF systems connected with visco-elastic damper (VED) are taken as research object and the primary structural vibration frequency ratio, connection stiffness and linking damping ratio as research parameters. Modified Kanai-Tajimi spectrum is selected to model the earthquake excitation. The peak distribution of power spectral density curves are analyzed, then the formulas of structural mean squared displacement (MSD) and research parameters is derived based on random vibration theory. Then the relationship of the adjacent structural seismic response versus the research parameters was presented. The optimal value of the linking visco-elastic damper damping ratio and stiffness ratio are investigated. Finally, the seismic responses of example structures with or without connecting dampers are contrastively analyzed. The dependence of response mitigation effective on research parameters is highlighted. The results indicate fine earthquake-reduction effectiveness of dampers connecting adjacent structures. It is also shows that optimal parameters of damper cannot reduce the seismic responses of the primary structures connected to the best extent simultaneously. The damper parameters should be determined according to the best seismic mitigation effectiveness of the primary, auxiliary structure or the combined structure system.

scholarly journals Study on Pounding Response of Adjacent Inelastic SDOF Structures Based on Dimensional Analysis

2021 ◽  
Vol 2021 ◽  
pp. 1-16
Author(s):  
Xuyong Chen ◽  
Huipeng Guo ◽  
Tao Wang ◽  
Qiaoyun Wu
Keyword(s):  
Dimensional Analysis ◽  
Frequency Ratio ◽  
Structural Parameters ◽  
Contact Process ◽  
Structural Response ◽  
Mass Ratio ◽  
Earthquake Excitation ◽  
Kelvin Model ◽  
Dimensionless Equation ◽  
Adjacent Structures

The dimensional analysis method is applied to study the pounding response of two inelastic single-degree-of-freedom (SDOF) structures under simplified earthquake excitation. The improved Kelvin pounding model is used to simulate the force and deformation of the collider during the contact process. Using bilinear interstory resistance model to simulate the inelastic characteristics of SDOF structures, the expression of dimensionless pounding force and the dimensionless equation of motion during the pounding process are deduced. When dimensionless parameters are used to represent the colliding equation of adjacent inelastic SDOF structures, the variables affecting the pounding response of the adjacent structures are reduced from 14 to 11, which can clearly reflect the rules during the pounding process. The correctness and superiority of the improved Kelvin model are verified by comparing the pounding responses between the improved Kelvin model and Kelvin model. The pounding response of the two inelastic SDOF structures with improved Kelvin model is illustrated in the form of spectra, and the self-similarity of pounding response of the two inelastic SDOF structures is revealed. The effects of structural parameters on the pounding response are analyzed. The results show that the effects of mass ratio, frequency ratio, and initial spacing between the adjacent inelastic SDOF structures on the pounding response of the left-side structure (with smaller mass and stiffness) are closely related to the division of spectral regions. For the right-side structure with larger mass and stiffness, the amplification of pounding on structural response increases with the increase of mass ratio Π m and decreases with the increase of frequency ratio μ and structural spacing Π d .

scholarly journals Study on Dynamic Structure-Soil-Structure Interaction of Three Adjacent Tall Buildings Subjected to Seismic Loading

2019 ◽  
Vol 12 (1) ◽  
pp. 336
Author(s):  
Jinsong Gan ◽  
Peizhen Li ◽  
Qiang Liu
Keyword(s):  
Soil Structure ◽  
Structural Characteristics ◽  
Tall Buildings ◽  
Dynamic Structure ◽  
Soil Structure Interaction ◽  
Soil Behavior ◽  
Earthquake Excitation ◽  
Skeleton Curve ◽  
Structure Interaction ◽  
Adjacent Structures

The dynamic structure-soil-structure interaction (SSSI) involving three adjacent structures with pile-raft foundations arranged along the east-west direction in a viscoelastic half-space is numerically studied under earthquake excitation. The direction of earthquake excitation is perpendicular to the direction of the structural arrangement. In the simulation, the Davidenkov model of the soil skeleton curve is assumed for soil behavior, and the viscous-spring artificial boundary is adopted. In order to investigate the effects of SSSI, the clear distance between structures, structure types, structure heights, and the first natural periods of structures are considered, and a series of numerical simulations are conducted. The peak floor displacement and the peak inter-story shear force of structures are examined to determine the SSSI effects. Results show that SSSI effects change significantly with these factors. Furthermore, the structural seismic response could be increased or reduced as a result of SSSI, depending mainly on the structural characteristics, rather than the location of the structures. These results are significant for studying the effects of SSSI and the sustainable development of cities, especially for the seismic design of dense urban buildings.

Optimum design and vibration control of a space structure with the hybrid semi-active control devices

2017 ◽  
Vol 19 (4) ◽  
pp. 341-350
Author(s):  
Meng Zhan ◽  
Sheliang Wang ◽  
Tao Yang ◽  
Yang Liu ◽  
Binshan Yu
Keyword(s):  
Vibration Control ◽  
Active Control ◽  
Optimum Design ◽  
Space Structure ◽  
Control Devices

3-D imaging of cells using a confocal laser scanning microscope and digital image processing

1988 ◽  
Vol 46 ◽  
pp. 96-97
Author(s):  
Thomas M. Jovin ◽  
Michel Robert-Nicoud ◽  
Donna J. Arndt-Jovin ◽  
Thorsten Schormann
Keyword(s):  
Laser Scanning ◽  
Confocal Laser Scanning Microscope ◽  
Laser Scanning Microscopy ◽  
Confocal Laser Scanning ◽  
Confocal Laser ◽  
Scanning Microscope ◽  
Laser Scanning Microscope ◽  
Biochemical Processes ◽  
Adjacent Structures

Light microscopic techniques for visualizing biomolecules and biochemical processes in situ have become indispensable in studies concerning the structural organization of supramolecular assemblies in cells and of processes during the cell cycle, transformation, differentiation, and development. Confocal laser scanning microscopy offers a number of advantages for the in situ localization and quantitation of fluorescence labeled targets and probes: (i) rejection of interfering signals emanating from out-of-focus and adjacent structures, allowing the “optical sectioning” of the specimen and 3-D reconstruction without time consuming deconvolution; (ii) increased spatial resolution; (iii) electronic control of contrast and magnification; (iv) simultanous imaging of the specimen by optical phenomena based on incident, scattered, emitted, and transmitted light; and (v) simultanous use of different fluorescent probes and types of detectors.We currently use a confocal laser scanning microscope CLSM (Zeiss, Oberkochen) equipped with 3-laser excitation (u.v - visible) and confocal optics in the fluorescence mode, as well as a computer-controlled X-Y-Z scanning stage with 0.1 μ resolution.

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