Probabilistic Seismic Performance Analysis of RC Bridges

Mosleh, Araliya; Jara, José; Razzaghi, Mehran S.; Varum, Humberto

doi:10.1080/13632469.2018.1477637

Cited by 42 publications

(17 citation statements)

References 60 publications

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“…Bridge girders are expected to respond in the elastic range during earthquakes [27]. Simply supported superstructures of medium span bridges supported on flexible elastomeric bearings move closely as a rigid body when subject to lateral loads and seismic demand is concentrated in piers [28]. These elements are aligned along the centreline of the bridge deck.…”

Section: Structural Modellingmentioning

confidence: 99%

Multi‐hazard fragility analysis of RC bridges for high seismicity and high scouring scenarios

Ghimire

Pradhan

Gautam

2022

The Journal of Engineering

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Both earthquakes and floods occur frequently in the Himalayas. Since bridge structures are designed considering earthquake forces alone, floods are causing significant damage to bridges almost every year across the Himalayas. Thus, it is obvious that floods and earthquakes are the two most important natural hazards that could alter the performance of bridges in the Himalayas. Furthermore, settlement and scouring are commonly observed in many bridges in Nepal and neighbouring regions in the Himalayas. To this end, the conventional earthquake force-based analysis approaches become conservative as the conventional approaches do not account for multi-hazard impacts and design considerations. To fulfil the gap regarding multi-hazard vulnerability characterization, this study presents a comparative assessment of single and multiple natural hazards that are likely to impact Nepali highway bridges. Seismic fragility functions for representative reinforced concrete (RC) bridges are developed for earthquake only and earthquake and scouring scenarios. Parametric variation of likely scouring depth obtained from the hydrological analysis is used to depict the probabilistic scenario to obtain fragility functions for various scouring levels. The sum of the findings outlines that the seismic vulnerability of RC bridges increases significantly when scouring precedes seismic excitation.

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Section: Structural Modellingmentioning

confidence: 99%

Multi‐hazard fragility analysis of RC bridges for high seismicity and high scouring scenarios

Ghimire

Pradhan

Gautam

2022

The Journal of Engineering

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“…where, µ is the requirement capacity ratio of the structure; A and B are regression coefficients. According to Equation (15), the regression analysis of each component of the bridge system under various failure states could be carried out, and the correlation analysis of the seismic demands of each component could be carried out according to the analysis results of nonlinear dynamic time history, and the relevant parameters of the seismic demands of the structural components of the bridge were obtained, as shown in Table 4. It can be seen from Table 4 that the correlation between pier and abutment collision was relatively weak, but the minimum correlation coefficient was still greater than 0.75.…”

Section: Probabilistic Seismic Demand Model and Correlation Analysis ...mentioning

confidence: 99%

“…The numerical fragility analysis method is based on the numerical simulation and dynamic response analysis of the bridge structure to establish the fragility curve. This method can effectively solve the problems resulting from the empirical method, so it is widely used in the study of the seismic fragility of bridges [15].…”

Section: Introductionmentioning

confidence: 99%

Seismic Damage Probability Assessment of Isolated Girder Bridges Based on Performance under Near-Field Earthquakes

Liu

Yang

2021

Applied Sciences

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This paper presents a copula technique for developing seismic fragility curves for an RC (reinforced concrete) isolated continuous girder bridge, by considering earthquake damage indicators such as bridge piers, isolated bearing components, and the main girder of collision damage. The results of this method are compared with those of the limit method of the first-order reliability theory. Meanwhile, the incremental dynamic analysis of the bridge structure under different failure conditions is carried out, and the randomness of the near-fault ground motion and the structural parameters are accounted. Based on the damage index of the isolated bridge under different damage conditions, the seismic fragility curves of each component and the whole isolated bridge are obtained. The research shows that the safety control of the isolated continuous girder bridge structure is mainly affected by the seismic fragility of the isolated bearing, the influence of bridge pier seismic fragility is relatively small, and the probability of beam collision in an isolated bridge is lower than that of a general bridge without isolation bearing. By applying the isolation scheme, the probability of different damage state of the bridge structure is greatly reduced, thus the seismic performance is improved. It also verifies the efficiency and superiority of copula technology. The results will provide a reference for future seismic damage prediction.

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“…According to previous research, four engineering demand parameters of piers were used for the seismic demand analysis of 3# pier [35][36][37][38]. e displacement of the pier-top (u), the curvature of the pier-bottom (κb), and pier-top (κt) and the strain in the longitudinal steel bar (ε) of the piers were selected.…”

Section: Preliminary Selection Of Ims and Edpsmentioning

confidence: 99%

A Seismic Demand Model for Bridges Based on IM and EDP Parameter Matching and Bidirectional Optimization

Shuai

Song

2021

Shock and Vibration

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The accuracy of seismic demand models in seismic vulnerability analysis of structures or components mainly depends on the seismic intensity measures (IMs) and engineering demand parameters (EDPs). This paper proposes a novel method to obtain the optimal seismic demand model for the seismic vulnerability analysis of bridges. The method obtains the IM-EDP combination by matching all IMs and EDPs within a wide range one by one, considering the contribution of multiple IM parameters to the seismic response of the structure and avoiding the blindness of EDP selection. The IM is determined by calculating Pearson correlation coefficient and partial correlation coefficient, controlling the correlation between EDP and IM (or IMs) to a minimum to reduce the multicollinearity within the vector IMs and avoid ill-conditioned models. The optimal seismic demand model is obtained by inspecting the scatter plot and residual plot of suboptimal seismic demand models determined from all combinations by guaranteeing efficiency and sufficiency. The efficiency of seismic demand models is guaranteed by controlling the root mean square error (RMSE) and the coefficient of determination (R2). The sufficiency of models is guaranteed by controlling the slope of fitted line. A continuous rigid frame bridge with double thin-walled piers is used as a case study and a dynamic time-history analysis is performed to obtain the seismic vulnerability of bridge with the proposed method. The results show that the proposed method is feasible and ideally suited for optimizing seismic demand model.

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Probabilistic Seismic Performance Analysis of RC Bridges

Cited by 42 publications

References 60 publications

Multi‐hazard fragility analysis of RC bridges for high seismicity and high scouring scenarios

Multi‐hazard fragility analysis of RC bridges for high seismicity and high scouring scenarios

Seismic Damage Probability Assessment of Isolated Girder Bridges Based on Performance under Near-Field Earthquakes

A Seismic Demand Model for Bridges Based on IM and EDP Parameter Matching and Bidirectional Optimization

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