FOSID: a fractional order spectrum intensity for probabilistic seismic demand modeling of extended pile-shaft-supported highway bridges under liquefaction and transverse spreading

2021 ◽  
Author(s):  
Xiaowei Wang ◽  
Abdollah Shafieezadeh ◽  
Jamie Ellen Padgett
Keyword(s):  
Fractional Order ◽  
Highway Bridges ◽  
Seismic Demand ◽  
Demand Modeling ◽  
Pile Shaft ◽  
Order Spectrum ◽  
Probabilistic Seismic Demand ◽  
Spectrum Intensity ◽  
Extended Pile Shaft

Fractional order intensity measures for probabilistic seismic demand modeling applied to highway bridges

2012 ◽  
Vol 41 (3) ◽  
pp. 391-409 ◽  
Author(s):  
Abdollah Shafieezadeh ◽  
Karthik Ramanathan ◽  
Jamie E. Padgett ◽  
Reginald DesRoches
Keyword(s):  
Fractional Order ◽  
Highway Bridges ◽  
Seismic Demand ◽  
Intensity Measures ◽  
Demand Modeling ◽  
Probabilistic Seismic Demand

scholarly journals Optimal Earthquake Intensity Measures for Probabilistic Seismic Demand Models of Base-Isolated Nuclear Power Plant Structures

Energies ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 5163
Author(s):  
Duy-Duan Nguyen ◽  
Tae-Hyung Lee ◽  
Van-Tien Phan
Keyword(s):  
Power Plant ◽  
Nuclear Power Plant ◽  
Nuclear Power ◽  
Seismic Demand ◽  
Lumped Mass ◽  
Earthquake Intensity ◽  
Intensity Measures ◽  
Demand Models ◽  
Probabilistic Seismic Demand ◽  
Spectrum Intensity

The purpose of this study is to evaluate the optimal earthquake intensity measures (IMs) for probabilistic seismic demand models (PSDMs) of the base-isolated nuclear power plant (NPP) structures. The numerical model of NPP structures is developed using a lumped-mass stick model, in which a bilinear model is employed to simulate the force-displacement relations of base isolators. In this study, 20 different IMs are considered and 90 ground motion records are used to perform time-history analyses. The seismic engineering demand parameters (EDPs) are monitored in terms of maximum floor displacement (MFD), the maximum floor acceleration (MFA) of the structures, and maximum isolator displacement (MID). As a result, a set of PSDMs of the base-isolated structure is developed based on three EDPs (i.e., MFD, MFA, and MID) associated with 20 IMs. Four statistical parameters including the coefficient of determination, efficiency (i.e., standard deviation), practicality, and proficiency are then calculated to evaluate optimal IMs for seismic performances of the isolated NPP structures. The results reveal that the optimal IMs for PSDMs with respect to MFD and MID are velocity spectrum intensity, Housner intensity, peak ground velocity, and spectral velocity at the fundamental period. Meanwhile, peak ground acceleration, acceleration spectrum intensity, A95, effective peak acceleration, and sustained maximum acceleration are efficient IMs for PSDMs with respect to MFA of the base-isolated structures. On the other hand, cumulative absolute velocity is not recommended for determining the exceedance of the operating basis earthquake of base-isolated NPP structures.

A Probabilistic Seismic Demand Model for Regular Highway Bridges

2016 ◽  
Vol 847 ◽  
pp. 307-318 ◽  
Author(s):  
Hai Bin Ma ◽  
Wei Dong Zhuo ◽  
Gu Yin ◽  
Ying Sun ◽  
Li Bo Chen
Keyword(s):  
Probability Distributions ◽  
Highway Bridges ◽  
Seismic Demand ◽  
Site Conditions ◽  
Demand Model ◽  
Demand Models ◽  
Probabilistic Seismic Demand ◽  
Performance Based Seismic Design ◽  
Seismic Demand Model ◽  
And Performance

Probabilistic seismic demand models are important for the design of structures based on the seismic probability and the performance of the structure. In this paper, the probabilistic seismic demands of 8 representative regular highway bridges are calculated using the cloud approach by selecting 2390 earthquake records for 3 different site conditions. These demands are expressed in terms of an intensity measure (IM), which is the spectral acceleration at the fundamental period with 5% damping, and an engineering demand parameter (EDP), which is the drift ratio at the top of pier. The probability distributions of the EDP are established at several IM levels. The results show that the EDPs have reasonably standard beta distributions at different IM levels. A correlation between the mean EDP and the IM is also established using regression analysis. The probabilistic seismic demand model is suitable for 3 different site conditions and can greatly simplify the calculation of seismic demand in the probability-based and performance-based seismic design of regular bridges.

scholarly journals Probabilistic seismic demand modeling of local level response parameters of an RC frame

2016 ◽  
Vol 15 (1) ◽  
pp. 1-23 ◽  
Author(s):  
Fabio Freddi ◽  
Jamie Ellen Padgett ◽  
Andrea Dall’Asta
Keyword(s):  
Local Level ◽  
Seismic Demand ◽  
Rc Frame ◽  
Demand Modeling ◽  
Probabilistic Seismic Demand
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