scholarly journals EFFECTIVENESS OF WAVE PASSAGE EFFECT OF SEISMIC ISOLATED AND NONISOLATED BRIDGES UNDER SPATIALLY VARYING GROUND MOTION

2018 ◽  
Vol 13 (3) ◽  
pp. 229-246
Author(s):  
Muhammet Yurdakul ◽  
Şevket Ateş
Keyword(s):  
Ground Motion ◽  
Passage Effect ◽  
Wave Passage ◽  
Spatially Varying ◽  
Wave Passage Effect

Effects of Spatial Variable Ground Motions on the Seismic Response of Base-Isolated Building

2010 ◽  
Vol 163-167 ◽  
pp. 4422-4428
Author(s):  
Yong Qin Lei ◽  
Yong Feng Du
Keyword(s):  
Seismic Response ◽  
Ground Motion ◽  
Ground Motions ◽  
Time History ◽  
Spatial Variable ◽  
Passage Effect ◽  
History Analysis ◽  
Large Plane ◽  
Wave Passage ◽  
Wave Passage Effect

Aimed to base-isolated building with large plane dimension, the change laws of seismic response for base-isolated building under spatial variable ground motions were researched. Firstly, the artificial spatial variable earthquake time histories were generated using spectral representation method based on code response spectrum. Then the 3-D FEM modal of one based-isolated building with large plane dimension was established and the seismic response of based-isolated building under spatially ground motion was studied by nonlinear time history analysis. The mitigation effects of based-isolated building with large plane dimension were compared each other at the cases of uniform excitation, non-uniform excitation considering only wave passage effect, non-uniform excitation considering both the wave passage effect and incoherence effect, multi-component uniform excitation, multi-component non-uniform excitation considering the wave passage effect and multi-component non-uniform excitation considering both the wave passage effect and incoherence effect. The results show that the seismic response of base-isolated structure with large plane dimension under the uniform excitation is relative safety. When the base-isolated building with large plane dimension is designed by time history analysis, the spatial variability of earthquake ground motion effects can be considered.

Influence of Incoherence and Wave Passage Effects on Seismic Performances of Long Immersed Tunnel

2019 ◽  
Vol 16 (05) ◽  
pp. 1840012 ◽  
Author(s):  
Z. Y. Chen ◽  
S. B. Liang ◽  
C. He
Keyword(s):  
Axial Compression ◽  
Time History ◽  
Earthquake Ground Motion ◽  
Seismic Responses ◽  
Low Frequencies ◽  
Passage Effect ◽  
Immersed Tunnel ◽  
Support Excitation ◽  
Wave Passage ◽  
Wave Passage Effect

This paper conducts time history analysis to explore the influence of spatially varying earthquake ground motion (SVEGM) on seismic responses of the long immersed tunnel. Incoherence effect and wave passage effect are mainly focused here. Moreover, three coherency models are adopted to investigate the sensitivity of the computed responses to the models. The calculation results show that SVEGM enlarges seismic responses of the immersed tunnel significantly than uniform excitation. Considering wave passage effect and incoherence effect simultaneously makes the seismic responses increase more sharply than considering the latter only. The deformation of Gina gasket is barely sensitive to coherency model, while the axial compression force is sensitive to coherency model. It indicates suppressing that the fundamental mode and dominating higher-mode response are the hallmark of multi-support excitation. The great differences of three models decay with separation at low frequencies and their coherency in frequency domain are the main reasons that cause the variations of the axial compression forces.

Influence of Wave Passage Effect on Seismic Response of Truss String Structure Co-Working with its Base Frame

2014 ◽  
Vol 533 ◽  
pp. 154-158
Author(s):  
He Peng Wang ◽  
Zhong Gen Xu ◽  
Chang Gen Deng
Keyword(s):  
Seismic Waves ◽  
Time History ◽  
Element Model ◽  
Seismic Responses ◽  
Passage Effect ◽  
History Analysis ◽  
Insertion Method ◽  
String Structure ◽  
Wave Passage ◽  
Wave Passage Effect

By inputting two groups of seismic waves with phase differences of 0.16s, 0.34s, 0.5 and 0.34s, 0.66s, 1.0s to column elements divided into four parts of lower story of finite element model with insertion method, this paper analyzed the influence of wave passage effect on seismic responses of truss string structure of Guangzhou Convention and Exhibition Centre co-working with its base frame by time history analysis method. The results show that: because of natural vibration characteristics of structure, wave traveling has some effect on seismic responses of truss string structure of Guangzhou Convention and Exhibition Centre.

Study of the Analysis Methods of Wave-Passage Effect Based on ABAQUS

2010 ◽  
Vol 163-167 ◽  
pp. 4316-4319
Author(s):  
Jue Yang Zhang ◽  
Zai Gen Mu ◽  
Ming Gan
Keyword(s):  
Great Influence ◽  
Large Mass ◽  
Advantages And Disadvantages ◽  
Passage Effect ◽  
Analysis Methods ◽  
Acceleration Method ◽  
The Difference ◽  
Wave Passage ◽  
Large Mass Method ◽  
Wave Passage Effect

Wave-passage effect of the seismic is the main reason of multi-support excitations, and there are always two analysis methods which are large mass method and acceleration method to study on the multi-support excitations, this paper take one kind of trussed structure as an example, use the two methods to consider the wave-passage effect of seismic, compare the difference between the results from using the two methods, and also compare the difference between single-support and multi-support excitations. This paper draw a conclusion that it is a precise way to using ABAQUS to analysis the wave-passage effect of the seismic; wave-passage effect of the seismic has an great influence on the reaction of long-span spatial structures, it must be considered in the similar projects; and the large method and acceleration method both have their advantages and disadvantages, so we should give concrete analysis to concrete problems.

Investigation of ground-motion spatial variability effects on component and system vulnerability of a floating cable-stayed bridge

2019 ◽  
Vol 22 (8) ◽  
pp. 1923-1937 ◽  
Author(s):  
Kai Ma ◽  
Jian Zhong ◽  
Ruiwei Feng ◽  
Wancheng Yuan
Keyword(s):  
Spatial Variability ◽  
Ground Motion ◽  
Seismic Vulnerability ◽  
Site Response ◽  
Soil Condition ◽  
System Level ◽  
Soil Conditions ◽  
Cable Stayed Bridge ◽  
Wave Passage ◽  
Spatially Varying

The effects of ground-motion spatial variability on the seismic vulnerability of a floating cable-stayed bridge with 420-m long main span are investigated using component and system-level fragility analysis methods. Four combinations of the spatial variability components are considered including (a) the incoherence effect; (b) the incoherence and wave-passage effects; (c) the incoherence and site-response effects; and (d) general excitation case including the incoherence, wave-passage, and site-response effects. Parametric study was carried out to assess the sensitivity of seismic fragility to the variation of spatial variability components. The results indicate that the bridge becomes more vulnerable under spatially varying excitations than uniform excitations. The fragile components and the bridge system become more vulnerable with an increase in incoherence level. The component and system-level vulnerabilities are not sensitive to the variation of apparent wave velocities in most cases. However, the site-response effect is more complex than incoherence and wave-passage effects. There is no general trend about its effect on different components, whereas the system fragility increases as the soil conditions of adjacent excitation sites change more significantly and the soil types vary from the soft to the firm along wave-traveling direction. In addition, the bridge tends to be more vulnerable if the soil condition of the reference site becomes softer for the general excitation case. Spatial variability effects, especially incoherence and site-response effects, should be considered in the fragility analyses of this type of bridges.

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