Effect of Ground Motion Directionality on Fragility Characteristics of a Highway Bridge

Basu, Swagata; Shinozuka, Masanobu

doi:10.1155/2011/536171

Cited by 22 publications

(4 citation statements)

References 16 publications

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“…The current approach to earthquake response analysis involves arbitrarily inputting two horizontal ground motions to structures without considering the direction of the input. However, studies have indicated that this method may underestimate seismic fragility, particularly in bridges [42,43]. It has been shown that the horizontal component of earthquake excitation significantly affects the torsional response of stress-ribbon bridges.…”

Section: Comparison Of Responses From Different Inputmentioning

confidence: 99%

Enhancing Seismic Performance of Steel-Plated Stress-Ribbon Bridge with Tuned Mass Dampers: A Finite-Element Study

Dong,

Zhang,

Huang

et al. 2023

Advances in Civil Engineering

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There has been a noticeable rise in the construction of lightweight stress-ribbon pedestrian bridges. In regions with a high risk of seismic activity, it is crucial to employ advanced seismic control technology to mitigate the impact of earthquakes and improve the bridge’s performance and durability. The objective of this study is to investigate the effect of tuned mass dampers (TMDs) on a steel-plated stress-ribbon bridge using the finite element method. The study aims to analyze the performance of various TMD designs focusing on both vertical and torsional modes. Multiple TMD configurations are considered and numerically compared. The results indicate that TMDs offer both a tuning effect and a static mass effect for stress-ribbon bridges. The tuning effect is most pronounced when the mass ratio falls between 2% and 4%. Installing a single TMD with a mass ratio of 0.05 can decrease vertical displacement along the entire span by up to 36%. Furthermore, a torsional TMD effectively reduces both the torsion of stress ribbons and the pier forces. As a recommendation, the combination of a single vertical displacement TMD and a torsional TMD can be considered the most appropriate scheme for earthquake response control. Moreover, the addition of TMDs reduces the bridge’s sensitivity to the direction of earthquake excitation. These findings contribute to a broader understanding of the earthquake performance of stress-ribbon bridges and assist designers in selecting appropriate control schemes to address vibrational issues.

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Section: Comparison Of Responses From Different Inputmentioning

confidence: 99%

Enhancing Seismic Performance of Steel-Plated Stress-Ribbon Bridge with Tuned Mass Dampers: A Finite-Element Study

Dong,

Zhang,

Huang

et al. 2023

Advances in Civil Engineering

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“…In order to achieve realistic results, it is essential to take soil structure interaction into account while modeling the structural system for bridges. In the literature, many of the researchers used soil springs to reflect this interaction [2,5,15,16] During the modeling process in the OpenSees program, "Py Simple1" material model was used for lateral soil resistance and "Tz Simple1" material model was used for axial resistance. The pile elements were divided into 0.5 m long members for the first 10 m length below the pile cap and 1 m long members for the last 10 m. The springs were assigned to the nodes of these small elements.…”

Section: Soil-structure Interactionmentioning

confidence: 99%

The Effect of Ground Motion Incidence Angle for Scoured Highway Bridges

Ateş,

Avşar

2023

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Bridges are usually built to connect two pieces of land where water flows between them. Over time, for the water crossing bridges it is inevitable to occur scour around bridge substructure and this may affect both the seismic demands and capacity of bridge members. Besides, the ground motion incidence angle is another critical issue that can amplify the seismic demands imposed on the bridges. In this study, it is aimed to investigate the seismic performance of a highway bridge which has a uniform scour around its piles. A soil structure interacted reinforced concrete bridge consisting of prestressed I-sectioned beams and deck is modeled in OpenSees program. Scour depth is varied from 0 m (no scour) to 5 m depth with a uniform increment of 1 m. During nonlinear time history analysis, 7 different strong ground motion records with their 3 components are used. To obtain critical incidence angle, horizontal components of ground motions are rotated from 0° to 180° with an increment of 15° by using linear transformation equations. Superstructure displacement, pier curvature and shear force demands are investigated for each scour depth and earthquake incidence angle in the scope of the study. Both scour depth and earthquake incidence angle affect the seismic response of the investigated highway bridge under the selected ground motion records.

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“…Several studies have investigated the effect of the loading direction on the dynamic characteristics of geometrically straight bridge structures. Torbol et al (2012) and Basu and Shinozuka (2011) highlighted the importance of considering the effect of the incidence angle in the seismic fragility assessment of bridge structures and concluded that neglecting this parameter may lead to an underestimation of the resultant fragility functions. Similarly, Taskari et al (2015) evaluated the multi-angle fragility of straight bridges and concluded that the fragility of individual components is highly sensitive to the input loading orientation.…”

Section: Introductionmentioning

confidence: 99%

System fragility evaluation of a curved highway bridge structure considering multi-direction seismic excitations

Rashid,

Nishio

2023

Advances in Structural Engineering

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This paper presents the impact of varying the input seismic excitation directions on the system fragility of a geometrically complex highway bridge structure. The traditional approach of fragility derivation in the principal loading directions (longitudinal and transverse) results in an under/overestimation of the system fragility. To reduce such errors, the contribution of all major vulnerable components to the system fragility in the critical loading direction must be considered. For this purpose, a series of nonlinear time-history analyses were conducted for a testbed configured geometrically curved highway bridge structure in Japan. Shear strain, ductility, and distortion strain were considered as engineering demand parameters for bearings, concrete pier, and steel piers, respectively. The demand dependency among the components was considered using the correlation coefficient matrix for fragility estimation. Subsequently, fragility functions with respect to the input loading directions were generated for the bridge components and system to quantify their sensitivity to seismic input excitation directions. The results show that the component fragility is significantly influenced by the input excitation direction. A relative comparison of the system fragility for different loading directions indicated that a 150° loading direction yielded a higher fragility demand. The findings suggest that the critical fragility assessment should not always be decided only along the principal loading directions.

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Effect of Ground Motion Directionality on Fragility Characteristics of a Highway Bridge

Cited by 22 publications

References 16 publications

Enhancing Seismic Performance of Steel-Plated Stress-Ribbon Bridge with Tuned Mass Dampers: A Finite-Element Study

Enhancing Seismic Performance of Steel-Plated Stress-Ribbon Bridge with Tuned Mass Dampers: A Finite-Element Study

The Effect of Ground Motion Incidence Angle for Scoured Highway Bridges

System fragility evaluation of a curved highway bridge structure considering multi-direction seismic excitations

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