The pulse effect on the isolation device optimization of simply supported bridges in near-fault regions

Jiang, Linwei; Zhong, Jue; Yuan, Wancheng

doi:10.1016/j.istruc.2020.06.034

Cited by 38 publications

(7 citation statements)

References 29 publications

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“…This study selected far‐fault records used in Jiang et al 14 Records 1–80 were selected from the Pacific Earth Engineering Research Center (PEER), and records 80–100 were selected from the database of the SAC project. The magnitude ranges from 5.8 to 6.9, and the epicentral distance ranges from 10 to 60 km.…”

Section: Ground Motionsmentioning

confidence: 99%

Probabilistic seismic performance of pylons of a cable‐stayed bridge under near‐fault and far‐fault ground motions

Wang

Zhong

2022

Earthquake Engineering and Resilience

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Pulse‐like ground motions significantly influence structural responses, indicating that more consideration should be given to the seismic design of structures in the near‐site region. However, less effort focuses on the seismic response of a cable‐stayed bridge under near‐field pulse‐like excitations, and the difference in structural responses caused by near‐field pulse‐like and far‐field ground motions is not fully captured. This paper, therefore, aims to investigate the effect of pulse‐like ground motions on a cable‐stayed bridge, and it presents a comparison of far‐field earthquakes. Considering the finite number of recorded ground motions, artificial pulse‐like ground motions are adopted in this study. Furthermore, two classical intensity measures (peak ground velocity [PGV] and peak ground acceleration) were used to establish the probabilistic seismic demand model for cable‐stayed bridges. Then, fragility curves associated with the pylon of the bridge were compared under the action of different types of excitations, and the damage state of the whole pylon is presented through the median point of the slight damage of the curvature of each pylon section. The results indicate that the bottom section of the pylon is damaged first under different seismic excitations, with the PGV as the index. Moreover, far‐fault ground motions have a greater impact on the curvature response of the longitudinal bridge section of the pylon than the near‐fault ground motions, so the damage is more serious.

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Section: Ground Motionsmentioning

confidence: 99%

Probabilistic seismic performance of pylons of a cable‐stayed bridge under near‐fault and far‐fault ground motions

Wang

Zhong

2022

Earthquake Engineering and Resilience

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“…Many previous studies have focused on seismic optimization for mitigation strategies (Jiang et al, 2020; Pang et al, 2021; Zhong et al, 2020). In this study, a multi-criteria optimization (MCO) procedure is used to quantitively identify the optimized design parameter combination.…”

Section: Sensitivity Analysis and Multi-criteria Optimizationmentioning

confidence: 99%

Seismic response sensitivity and optimal design of an isolated multi-span continuous highway bridge with self-centering SMA RC bridge piers and superelastic SMA restrainers

Wang

Alam

2022

Journal of Intelligent Material Systems and Structures

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The use of superelastic shape memory alloy (SMA) in reinforced concrete (RC) pier and restrainers between girder and pier/abutment has been proposed in an earlier study to improve the seismic performance of highway bridges. This paper aims at identifying the significant factors that affect the seismic response of such a novel bridge system. A sequential fractional factorial design method is performed to statistically evaluate the effects of six design factors (three geometry-related and three material-related) as well as their interactions. Additionally, a multi-criteria optimization technique is implemented to determine the most efficient combination of the design parameters for SMA RC piers and SMA restrainers. Results demonstrate that the geometry-related factors and their interactions have large effects (with a contribution greater than 91%) on the relative displacement between the girder and pier. The target residual drift of the pier, design target displacement of the restrainer, and their interaction are the three most significant factors (with contributions approximately 30%–68%) affecting the base shear of the pier. The residual drift of the pier is sensitive to the design target displacement of the restrainer, its interaction with the forward transformation stress of SMA, and material-related factors with regard to the energy dissipation of SMA.

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“…Therefore, the need to change location and move a lot in earthquakes near the fault due to the frequency content and special features of these records is one of the limitations of this system [17]. In recent years this issue may have been solved to some extent with additional dampers added to the isolation system, especially in bridges [18]. Wu et al [19] studied the failure of structures on sandstone and mudstone.…”

Section: Introductionmentioning

confidence: 99%

Building's Controlled Seismic Isolation by Using Upper Horizontal Dampers and Stiff Core

Jouneghani

Hosseini

Rohanimanesh

et al. 2023

Turkish Journal of Civil Engineering

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The fundamental period of the seismically isolated buildings may be close to that of the long period pulses of near-filed earthquakes, leading to very large lateral displacements in isolators, which in turn can considerably reduce the stability of isolators, increase the chance of collision of the isolated buildings to adjacent buildings, or even result in overturning of the isolated buildings. Therefore, it is important to control these types of buildings and reduce the amount of lateral displacement in their isolating system. In this study, by conducting a series of time history analyses for a set of five multi-story steel buildings with various numbers of stories from 3 to 14, each having a very stiff core structure and a set of crosswise viscous dampers, connecting the building structure to the core structure at the lowest and the top floors, as well as the same structures without the core structure and dampers, the effect of stiff core and dampers in reducing the lateral displacement at isolators has been shown. Results indicate that by the proposed technique, the lateral displacement of the base isolation system is significantly decreased particularly for low-rise buildings.

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The pulse effect on the isolation device optimization of simply supported bridges in near-fault regions

Cited by 38 publications

References 29 publications

Probabilistic seismic performance of pylons of a cable‐stayed bridge under near‐fault and far‐fault ground motions

Probabilistic seismic performance of pylons of a cable‐stayed bridge under near‐fault and far‐fault ground motions

Seismic response sensitivity and optimal design of an isolated multi-span continuous highway bridge with self-centering SMA RC bridge piers and superelastic SMA restrainers

Building's Controlled Seismic Isolation by Using Upper Horizontal Dampers and Stiff Core

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