Identification of the significant uncertain parameters in the seismic response of irregular bridges

2017 ◽  
Vol 141 ◽  
pp. 356-372 ◽  
Author(s):  
Farahnaz Soleimani ◽  
Brani Vidakovic ◽  
Reginald DesRoches ◽  
Jamie Padgett
Keyword(s):  
Seismic Response ◽  
Uncertain Parameters ◽  
Irregular Bridges

scholarly journals Investigating the Use of Natural and Artificial Records for Prediction of Seismic Response of Regular and Irregular RC Bridges Considering Displacement Directions

2021 ◽  
Vol 11 (3) ◽  
pp. 906
Author(s):  
Payam Tehrani ◽  
Denis Mitchell
Keyword(s):  
Seismic Response ◽  
Radial Displacement ◽  
Time History ◽  
Good Prediction ◽  
3D Analysis ◽  
Combination Rules ◽  
Principal Axes ◽  
Artificial Records ◽  
The Mean ◽  
Irregular Bridges

The seismic responses of continuous multi-span reinforced concrete (RC) bridges were predicted using inelastic time history analyses (ITHA) and incremental dynamic analysis (IDA). Some important issues in ITHA were studied in this research, including: the effects of using artificial and natural records on predictions of the mean seismic demands, effects of displacement directions on predictions of the mean seismic response, the use of 2D analysis with combination rules for prediction of the response obtained using 3D analysis, and prediction of the maximum radial displacement demands compared to the displacements obtained along the principal axes of the bridges. In addition, IDA was conducted and predictions were obtained at different damage states. These issues were investigated for the case of regular and irregular bridges using three different sets of natural and artificial records. The results indicated that the use of natural and artificial records typically resulted in similar predictions for the cases studied. The effect of displacement direction was important in predicting the mean seismic response. It was shown that 2D analyses with the combination rules resulted in good predictions of the radial displacement demands obtained from 3D analyses. The use of artificial records in IDA resulted in good prediction of the median collapse capacity.

The Stochastic Seismic Response Analysis on Nonlinear Pile-Soil-Structure Interaction System with Uncertain Parameters

2011 ◽  
Vol 243-249 ◽  
pp. 3940-3944
Author(s):  
Ai Hong Zhou ◽  
Ying Yuan ◽  
Ji Hua Chen
Keyword(s):  
Seismic Response ◽  
Vibration Analysis ◽  
Soil Structure ◽  
Soil Structure Interaction ◽  
Equivalent Linearization ◽  
Uncertain Parameters ◽  
Structure Interaction ◽  
Material Parameters ◽  
Interaction System ◽  
Stochastic Seismic Response

In order to solve the problem of the analysis of seismic response for nonlinear pile-soil-structure interaction system with uncertain parameters subjected to stochastic external excitation, a simple and practical method was proposed in this paper, and the corresponding plug-in program was developed on the platform of universal software ANSYS. Firstly, the stochastic vibration analysis was converted into the definite harmonic vibration analysis accurately by means of the pseudo-excitation method. Secondly, perturbation theory of small parameter was introduced to consider the uncertain material parameters and direct interpolation equivalent linearization model was used to simulate the nonlinearity of material. Finally, the effects of the variability of shear modulus, damping ratio, density and Poisson’s ratio on the stochastic seismic response of the pile-soil-structure interaction system are studied. The results show that the variability coefficients of the response have the same magnitude as the input material parameters and the influence of the variability of material parameters on the response magnitude can’t be ignored.

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