Impact of vertical ground motion on the statistical analysis of seismic demand for frictional isolated bridge in near-fault regions

Zhong, Jue; Zhu, Yuntao; Han, Qiang

doi:10.1016/j.engstruct.2022.115512

Cited by 34 publications

(3 citation statements)

References 43 publications

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“…Vertical components were not considered because of their less significant impact on the structural performance (Abbasi et al, 2016;Mosqueda et al, 2004;Usami et al, 2004). However, for near-field ground motions, the impact of the vertical component may be statistically significant and should not be neglected, which is not the case in this study (Zhong et al, 2023). The characteristics of the selected waveforms are listed in Table 4.…”

Section: Ground Motions Selection and Excitation Directionmentioning

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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Section: Ground Motions Selection and Excitation Directionmentioning

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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“…For the refined model, shell element was used to sim ulate concrete deck slabs, steel girders were simulated by elastomeric frame element, and the shear nail connections between girders and slabs were simulated by Link units, and shear nail stiffnesses were considered in this model. The refined model is able to take into account not only the effect of the actual distribution of stiffness and mass of the composit girder, but also the effect of the mechanical properties of the shear nail connection on th In general, the bridge superstructure is in an elastic state under seismic action [18][19][20][21][22][23][24]. Due to the small stiffness and mass of the steel-concrete composite girders in this bridge, a reasonable simulation of the actual distribution of stiffness and mass may have some influence on the seismic response of the bridge.…”

Section: Finite Element Model (Fem) 231 Bridg Overviewmentioning

confidence: 99%

Study on Seismic Performance Optimization of Assembly Concrete-Filled Steel Tubular (CFST)-Laced Piers

Chen,

Zuo,

Zhang

et al. 2023

Sustainability

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This study aims to investigate the seismic behavior of concrete-filled steel tubular (CFST)-laced piers; after verifying the model through engineering tests, the simplified finite element models (S-FEM) and refined ones (R-FEM) with CFST-laced piers are developed in this manuscript, respectively. Through comparison, it is found that the S-FEM can effectively improve analyzing efficiency while meeting the requirements of engineering analysis accuracy. In addition, the seismic response of assembled flange-connected CFST-laced piers bridge was studied based on the S-FEM, and different structural parameters, including pier height, axial compression ratios, steel ratios of CFST columns, steel lacing tube arrangement, and longitudinal slope, are considered to optimize the bridge design scheme. Results indicate that the parameters of 0.1 axial pressure ratios and 1:30 longitudinal slope show superior seismic performance. Meanwhile, the peak axial force and peak bending moment of CFST column limbs occur at the pier bottom, and the flanges, which are subject to larger bending moments, are generally located at the two connection positions above the pier bottom.

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“…When the seismic P wave propagates in the sea, the cancellation interference effect greatly reduces the intensity of the vertical component of the seabed ground motion, resulting in a lower vertical and horizontal peak acceleration ratio of the seabed ground motion compared to that of the land ground motions. Therefore, the vertical ground motion is not considered in this paper [21][22][23].…”

Section: The Finite Element Analysis Modelmentioning

confidence: 99%

Seismic Risk Analysis of Offshore Bridges Considering Seismic Correlation between Vulnerable Components

2023

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To comprehensively evaluate the seismic performance of offshore bridges, a seismic risk analysis of an example bridge was developed based on improved two-dimensional (2D) seismic fragility analysis. Taking a simply-supported beam bridge in an offshore tidal environment as an example, the adverse effects of chloride ion erosion are considered and the seismic response process of the example bridge is simulated using the Incremental Dynamic Analysis (IDA) method. The appropriate damage indexes are chosen for the plate rubber bearing and the pier , and the one-dimensional (1D) seismic fragility curves of single components and the entire bridge are obtained. The correlation coefficients of vulnerable components are quantitatively proposed based on the correlation analysis method, and the 2D seismic fragility curves of the entire bridge are achieved while accounting for seismic correlation between vulnerable components. The seismic risk probability of the entire bridge is finally determined after combining hazard analysis at the bridge site and seismic loss analysis. The results show that there is a significant correlation between vulnerable components and that 2D seismic fragility analysis based on the reliable correlation coefficients of vulnerable components can more comprehensively evaluate the seismic performance of the entire bridge. In the context of seismic disaster reduction research focused on slight and moderate damage caused by moderate-to-small ground motions, this research can provide scientific and technical support for seismic design and seismic risk assessment of offshore bridges.

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Impact of vertical ground motion on the statistical analysis of seismic demand for frictional isolated bridge in near-fault regions

Cited by 34 publications

References 43 publications

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

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

Study on Seismic Performance Optimization of Assembly Concrete-Filled Steel Tubular (CFST)-Laced Piers

Seismic Risk Analysis of Offshore Bridges Considering Seismic Correlation between Vulnerable Components

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