Seismic fragility analysis of railway reinforced concrete bridges considering real‐time vehicle‐bridge interaction with the aid of co‐simulation techniques

Paraskevopoulos, Elias

doi:10.1002/eqe.3657

Cited by 14 publications

(5 citation statements)

References 59 publications

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“…IDA is widely used in earthquake induce VBI analysis but requires special algorithms to improve computational efficiency. For instance, the seismic fragility analysis taken by Stefanidou and Paraskevopoulos 38 needs to calculate a large number of working conditions by using general IDA method (constant step method). On the other hand, the Hunt & Fill 39–41 method used in ref 8 .…”

Section: Linear Contact Model Based Detachment Pga Prediction Methodsmentioning

confidence: 99%

Simplification of earthquake induced vehicle bridge interaction contact simulation for urban viaducts

Shi

Lin

2023

Earthq Engng Struct Dyn

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The possibility of motor vehicles parking on or slowly driving on the urban viaducts during earthquakes has been largely increased to a non‐negligible level due to the traffic jams in most of modern cities. As a fact of the earthquake disaster investigation, detachment and collision between motor vehicles and the bridge deck endangered the safety of both drivers and the bridge structure itself. In recent studies, Hertz model was therefore proposed to simulate this nonlinear contact and collision behavior with the complexity and inefficient in solving the kinetic equilibrium equations of earthquake induced vehicle bridge interaction (VBI) system, and hence hindered the comprehensive numerical analysis. In this paper, two linearized contact models, that is, a piecewise linear tangent model derived by Taylor series expansion of the Hertz model and a piecewise secant model derived by least square method of error minimization of the Hertz model, are both proposed to simplify the simulation of the vehicle bridge contact behavior for earthquake induced VBI system. A total of 3*2041VBI parametric systems considering different vehicle masses, frequencies and ground motions, are calculated and statistically analyzed to compare the accuracy of each model with nonlinear Hertz model. Statistical analysis result shows that the vertical contact force calculated by two simplified models are acceptable in earthquake induced VBI analysis with less than 10% error in more than 99% analysis cases. However, the piecewise tangent model is more accurate than the piecewise secant model when the vehicle and bridge stay attached. If detachment occurs, the secant model would have higher accuracy in predicting the initial peak ground acceleration (PGA) of vehicle detachment from the bridge. Based on this result, a formula using the piecewise secant model for predicting the initial detachment PGA of vehicles from the bridge deck is proposed to simplify the increment dynamic analysis (IDA) method in further earthquake induced VBI analysis.

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Section: Linear Contact Model Based Detachment Pga Prediction Methodsmentioning

confidence: 99%

Simplification of earthquake induced vehicle bridge interaction contact simulation for urban viaducts

Shi

Lin

2023

Earthq Engng Struct Dyn

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“…However, up to now, only a few papers have been published on the vibration of the train-bridge system induced by an overheight collision force to the bridge superstructure and its influence on the dynamic responses of the railway bridge system [1]. The dynamic behavior of a train-bridge interaction system is a complicated problem that involves vehicle (train) modelling and bridge system modelling issues [2,3]. The dynamic response of the railway bridgetrain interaction has been studied extensively [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Study on a 3D Train-Track-Bridge System Dynamic Behavior Subjected to Over-Height Collision Force

Taghipour,

Zakeri,

Jahangiri

et al. 2024

Period. Polytech. Civil Eng.

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Railway bridges are built to allow trains to cross over highways, valleys, or other transportation infrastructure. In recent years, the number of railway bridges subjected to over-height collision forces has increased. These collisions damage the bridge and affect the safety of the running train. In this investigation, first, a 3D GT26 train-track-bridge interaction model was created to study the effects of collision forces applied to the bridge superstructure and not to the bridge piers as a novelty of this research using the finite element analysis. Then, the dynamic responses of the railway bridge due to the GT26 train load and subjected to over-height collision forces were obtained. Finally, the different sensitivity analyses describe that changing the length of the collision area, the bridge span, and the value of collision forces affect the dynamic responses of the bridge in the contact area. The results show that maximum lateral displacement of the concrete girder in case of assuming the GT26 train 3D model plus over-height collision force is 8.88% less than the case in which considering only freight train axle-load and same over-height collision force apply to the bridge superstructure, and its value reduces from 45 mm to 41 mm. The maximum lateral displacement of the bridge deck is reduced by about 71% by increasing the collision area length from 0.2 m to 1.2 m and at the impact area rises about 43.5% by changing collision speed from 48 km/hr to 144 km/hr as collision force from 7753 kN to 13370 kN.

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“…In addition, to examine structural dynamic responses under thermal loads and an accelerating mass, Esen (2019) considered material nonlinearity due to temperature increase for a Timoshenko beam with simple supports. Typically, the frameworks for VBI problems including bridge nonlinearity have been proposed by implementing a coupled system with FE software for bridges and in-house code for vehicle and their interaction (Borjigin et al, 2018; Gong et al, 2020; Stefanidou and Paraskevopoulos, 2022). Then, the responses of each system are exchanged until satisfying equilibrium conditions.…”

Section: Introductionmentioning

confidence: 99%

Post-fire nonlinear vehicle–bridge interaction analysis considering hysteretic material behavior

Piao

Kim

2023

Advances in Structural Engineering

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Deteriorating bridges and potential vulnerabilities are crucial in the structural assessment of railroad bridges. Among various hazards that a bridge may encounter, evaluating the bridge after a fire is important because it may change the behavior of the bridge. More specifically, the post-fire bridge exhibits structural stiffness degradation, residual stress accumulation, and residual deflection. Due to those residual responses further affecting the dynamics of the bridge, analyzing the post-fire behavior of a bridge subject to normal traffic usage becomes important. Thus, this paper proposes a framework that assesses the dynamic behavior of a post-fire bridge considering the material hysteresis due to thermal loads and vehicle-bridge interaction (VBI). The proposed model is different from previous approaches in that the nonlinear VBI analysis is analyzed in an integrated system equation. So far, most related works exchange the data between separate finite element analysis software and in-house codes, intrinsically facing convergence problems. Instead, by adopting the augmented representation approach, the proposed framework becomes computationally efficient. Herein, nonlinear structural fire analysis is performed to obtain post-fire responses of the bridge. Then, the dynamic analysis is realized by incorporating material hysteretic behavior and VBI systems. The proposed framework is validated against the linear VBI model under gravity load. Subsequently, parametric studies are presented to represent various fire scenarios and long-term serviceability. The results demonstrate that the proposed model provides an effective tool for evaluating post-fire bridge dynamics by including material hysteresis under cyclic traffic loads. Moreover, the proposed framework can easily accommodate various types of hazards as well that cause the nonlinear behavior of the system.

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Seismic fragility analysis of railway reinforced concrete bridges considering real‐time vehicle‐bridge interaction with the aid of co‐simulation techniques

Cited by 14 publications

References 59 publications

Simplification of earthquake induced vehicle bridge interaction contact simulation for urban viaducts

Simplification of earthquake induced vehicle bridge interaction contact simulation for urban viaducts

Study on a 3D Train-Track-Bridge System Dynamic Behavior Subjected to Over-Height Collision Force

Post-fire nonlinear vehicle–bridge interaction analysis considering hysteretic material behavior

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