Influence of earthquake input angle on seismic response of curved girder bridge

Ni, Yongjun; Chen, Jiayu; Teng, Hualiang; Jiang, Hui

doi:10.1016/j.jtte.2015.05.003

Cited by 13 publications

(6 citation statements)

References 5 publications

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“…ü zg (t) and ü s3 (t) represent the vertical motions which are not affected by planar rotation. The transformation matrix (T) is used to perform this operation and is based solely on geometry [36]. Notably, the term üzg(t) shows the vertical motion, which is not affected by planar rotation.…”

Section: Ground Motion Incidence Anglementioning

confidence: 99%

“…Designers often do not know the direction in which predominant ground motion will occur at a bridge site. Many studies have been conducted to determine earthquake behaviours affecting bridges [28][29][30][31][32][33][34][35][36]. In Cronin's [37] thesis, the effect of the incidence angle on the nonlinear structural response of highway bridges was investigated through extensive statistical simulations.…”

Section: Introductionmentioning

confidence: 99%

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Influence of earthquake angle on seismic performance of concrete highway bridges

Lakusic

2023

JCE

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This study aims to evaluate the effect of earthquake angle on the seismic performance of a concrete highway bridge. As a numerical example, a twin prestressed concrete box-girder highway bridge was analysed using finite element methods. The bridge was subjected to the 1992 Erzincan earthquake ground accelerations in 19 directions with values ranging from 0° to 90° in 5-degree increments. To evaluate the effects of different earthquake angles on seismic performance, variations in the maximum displacements, internal forces and principal stresses on the bridge deck, columns, isolator and foundation were studied . The results changed considerably for different earthquake angles. Variations in the displacement, internal forces and principal stresses occurred at different incidence angles. In other words, there is no unique angle of incidence for each structure.

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Section: Ground Motion Incidence Anglementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of earthquake angle on seismic performance of concrete highway bridges

Lakusic

2023

JCE

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“…Factors such as the curvature and connection type of the pier and beam were also analyzed. Ni [5] investigated the influence of the seismic ground motions input angle on the seismic response of a curved girder bridge. erefore, it is very important to determine the worst-case input angle of seismic ground motion, which is one of the main methods to analyze the impact of the input angle of seismic ground motion on the seismic performance evaluation results of plan-asymmetric structures.…”

Section: Introductionmentioning

confidence: 99%

Seismic Fragility Assessment of RC Plan-Asymmetric Wall-Frame Structures Based on the Enhanced Damage Model

Wang

Huang

Zhang

2021

Shock and Vibration

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The seismic response of reinforced concrete (RC) plan-asymmetric structures is significantly influenced by the input angle of seismic ground motions. Hence, it is challenging to assess the performance of plan-asymmetric structures. In this study, the classic probabilistic seismic fragility assessment method is used to assess RC plan-asymmetric wall-frame structures based on the enhanced damage model. First, the worst-case input angle of seismic ground motions for plan-asymmetric structures is identified using the wavelet transforms coefficient method, considering the coupling of bidirectional seismic ground motions. Accordingly, the maximum deformation and hysteretic energy dissipation can be determined. Then, an enhanced damage model, which is based on the combination of deformation and hysteretic energy dissipation, is used to identify floor damage factor. Note that the importance coefficients of structural components are considered in the identification. Meanwhile, the incremental dynamic analysis (IDA) is conducted to create the fragility curves by assuming floor damage factor as seismic performance index. In particular, the randomness of the threshold for floor damage factor is considered during the assessment. Afterwards, numerical simulations are employed to verify the fragility assessment method. Results show that the wavelet transforms coefficient method can evaluate the worst-case input angles with low time-consuming and high efficiency. Meanwhile, the story damage factors confirmed that the proposed damage model could accurately assess the structure during the failure process. Moreover, the typical failure modes of the RC wall-frame structure, which significantly depend on the story damage distribution, can be defined using the enhanced damage model. Note that the randomness of the threshold could significantly affect the probability of exceedance, which is important for fragility analysis.

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“…While curved bridges have been favored by engineers and bridge designers, such bridges have also suffered severe impacts by earthquakes. 2 The geometric irregularity of curved bridges increases the deviation between the girder’s center of mass and their center of stiffness, which leads to the spatial coupling force of curved bridges especially under multi-dimensional earthquake excitation. Unfortunately, the curved bridges suffered severe damages or even collapsed during 2008 Wenchuan Earthquake.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigations on the effects of radius of curvature and longitudinal slope on the responses of curved bridges subject to seismic pounding

Jiao

Wang

et al. 2021

Measurement and Control

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Because of the irregular geometries, earthquake-induced adjacent curved bridge pounding may lead to more complex local damage or even collapse. The relevant research is mainly concentrated on the numerical analysis which lack experimental verification and discussion by changing of structural parameters. In this paper, a scaled three-dimensional numerical model of a curved bridge is established based on 3D contact friction theory for investigating the uneven distribution of pounding forces at the expansion joint of the bridge. Shaking table tests were carried out at first on a curved bridge to validate the numerical model. A series of parametric studies were then conducted to examine the impacts of the radius of curvature and longitudinal slope of the superstructure of the curved bridge on its seismic pounding response. The results show that the maximum pounding force first increases and then decreases as the radius of curvature increases, but that it decreases monotonically with the growth of the longitudinal slope. These results suggest that controlling the radius of curvature and the longitudinal slope of the superstructure of the bridge can reduce the localized high stress that is induced by seismic pounding. Also, the unevenly distributed pounding forces can significantly increase the relative radial displacement of the bridge’s deck corners, although the relative tangential displacement may decrease. It is thus necessary to adopt effective anti-pounding measures to prevent the superstructure of the bridge from being unseated.

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Influence of earthquake input angle on seismic response of curved girder bridge

Abstract: Please cite this article as: Ni, Y., Chen, J., Teng, H., Jiang, H., Influence of earthquake input angle on seismic response of curved girder bridge, Journal of Traffic and Transportation Engineering (English Edition) (2015),

Cited by 13 publications

References 5 publications

Influence of earthquake angle on seismic performance of concrete highway bridges

Influence of earthquake angle on seismic performance of concrete highway bridges

Seismic Fragility Assessment of RC Plan-Asymmetric Wall-Frame Structures Based on the Enhanced Damage Model

Experimental and numerical investigations on the effects of radius of curvature and longitudinal slope on the responses of curved bridges subject to seismic pounding

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