Probabilistic sensitivity analysis of multi-span highway bridges

Bayat, Mahmoud; Daneshjoo, F.; Nisticò, Nicola

doi:10.12989/scs.2015.19.1.237

Cited by 13 publications

(5 citation statements)

References 19 publications

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“…In the study of existing durability of concrete, carbonation depth is used as a parameter, but the effect of its size in structural section cannot be taken into consideration if putting the depth of carbonization as a parameter of carbonization to concrete performance. In this paper, the carbonation rate [28,29] is chosen as the calculation parameter, as shown in Figure 4, and the calculation of related parameters [30] is shown in (5)- (12). And the peak stress, peak strain, and elastic modulus of concrete in the life cycle are shown in…”

Section: Definition Of Carbonated Concretementioning

confidence: 99%

“…Considering the degradation effect of chloride ion erosion on the properties of reinforcing steel bars and by analyzing the seismic fragility of a two-span bridge, Choe and others [10] conclude that the corrosion of reinforcing steel bars will have a certain effect on the seismic performance of concrete bridges. A new intensity measure of earthquakes for probabilistic seismic analysis is presented 2 Complexity for skewed highway bridges by Bayat [11,12]. Andre et al [13] concerns the development of a new structural robustness definition, and structural robustness and structural fragility indices.…”

Section: Introductionmentioning

confidence: 99%

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Analysis on the Time‐Varying Fragility of Offshore Concrete Bridge

et al. 2019

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For offshore bridges, the most prominent problem in the whole life cycle is that it is in an earthquake prone zone and an offshore corrosion environment at the same time. A nonlinear dynamic analysis model is set up for an offshore multispan and continuous rigid frame bridge based on the OpenSEES platform. The fragility surface of the bridge pier, bearing, bridge platform, and system are established by selecting a reasonable damage constitutive model of the material durability and a damage index analysis that studies the damage of the bridge durability to time-varying seismic fragility of bridge components and the system of the whole life cycle in offshore environment. The results show that the durability damage will lead to a constant decline in seismic capacity of the pier and an increase of the seismic demand under earthquake action as well as the probability to reach the ultimate failure state; compared to high piers, a low pier is more vulnerable to the offshore corrosion environment; the seismic fragility of bridge platform is higher than that of simply bearing; and the influence of offshore corrosion on environment is relatively large. With the prolongation of service period, the effect of durability damage on the seismic fragility of bridge system cannot be ignored in the coastal environment and it is necessary to make a reasonable evaluation on the seismic fragility of bridge structure during the whole life period.

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Section: Definition Of Carbonated Concretementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis on the Time‐Varying Fragility of Offshore Concrete Bridge

et al. 2019

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“…[12] are modeled by using Finite Element Method (FEM). Some more detailed modelling techniques of bridge elements can be found in [13][14][15][16]. Bridges with the subtended angle between 0-90 are modeled in this research.…”

Section: Finite Element Modelmentioning

confidence: 99%

A novel index for damage detection of deck and dynamic behavior of horizontally curved bridges under moving load

Najafabadi¹,

Daneshjoo²,

Bayat³

2017

J. vibroeng.

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The purpose of this paper is to evaluate the responses of horizontally curved bridges that are affected by vehicles load. The effect of vehicles dynamic loads on bridges is influenced by factors such as geometric characteristics of structures and moving loads specifications. To consider the effect of dynamic loads in design of bridges, static load increases with a coefficient which is called "impact factor" in Design Codes. In this paper, by examining the effect of curvature of deck and the speed of vehicles which are passing along the bridge on the dynamic response of bridge, set of new equations for DAF is presented. For this purpose, dynamic analysis is performed for seven bridges with different radius of curvature under the influence of AASHTO truck. In the case study models, it can be seen that the separation of impact factor into two different coefficients; support reaction and displacement responses make bridge design more economical and safer. Reduction of the curvature radius decreases dynamic amplification factor (both coefficients). To identify the possible damages of the examined bridges in the early stages of the advent a new index is presented. This index can predict the damages due to moving vehicles.

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“…So far, few studies about wall pier bridges have been published [1,2]. There are some gaps to be filled: (1) Formerly used finite elements such as fiber-based beam-column element are not quite suitable for the simulation of wall piers, and some newly-developed finite elements have not been applied to this field; (2) The seismic capacity models of common pier columns developed in previous studies cannot be applied to the wall pier, a parameter-dependent capacity model is worth further developing. In this study, these problems are analyzed and discussed, and a seismic vulnerability model of the wall pier girder bridge is proposed.…”

Section: Introductionmentioning

confidence: 99%

A Probabilistic Capacity Model and Seismic Vulnerability Analysis of Wall Pier Bridges

Li-bo

2020

Applied Sciences

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This study aims to establish a probabilistic capacity model of a wall pier under various damage states, and the seismic vulnerability of a typical wall pier bridge is studied. The finite element analysis of the wall pier is carried out by using the layered shell element, and its accuracy is verified through the comparison with the experimental results. A series of wall pier samples are generated based on the survey data, and the corresponding finite element models are established. The hysteresis analysis is implemented to obtain the displacement drift ratio of each seismic performance point. A candidate capacity model with various factors is proposed, and the unknown parameters are estimated and filtered by the Bayesian method. One hundred and twenty bridge samples of a benchmark bridge are generated by considering the uncertainty of parameters, and the finite element models are established. The bridge samples and ground motions were matched by one-to-one correspondence for the nonlinear time history analysis, and seismic vulnerability models of bridge components and system are obtained. The results showed that the in-plane capacity of wall piers is mainly affected by axial compression ratio, shear span ratio, and vertical reinforcement ratio. The wall pier shows excellent behavior in the earthquakes. The capacity models of wall piers can be used for evaluating the damage states of wall piers, and obtaining the seismic vulnerability model of wall piers bridges to be used for future seismic risk assessment and retrofit prioritization.

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Probabilistic sensitivity analysis of multi-span highway bridges

Cited by 13 publications

References 19 publications

Analysis on the Time‐Varying Fragility of Offshore Concrete Bridge

Analysis on the Time‐Varying Fragility of Offshore Concrete Bridge

A novel index for damage detection of deck and dynamic behavior of horizontally curved bridges under moving load

A Probabilistic Capacity Model and Seismic Vulnerability Analysis of Wall Pier Bridges

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