Optimal Intensity Measures in Probabilistic Seismic Demand Models of Cable-Stayed Bridges Subjected to Pulse-Like Ground Motions

Zhong, Jue; Jeon, Jong‐Su; Shao, Yahui; Liang, Chen

doi:10.1061/(asce)be.1943-5592.0001329

Cited by 96 publications

(23 citation statements)

References 23 publications

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“…The detailed mechanism of the fault, the moment magnitude ( M ), the source-to-site distance ( R ) of each ground motion can be found in Dabaghi and Der Kiureghian (2017) and Zhong et al (2019). Each pulse-like record was rotated to the direction which contains the largest pulse amplitude and the corresponding orthogonal horizontal direction following the method proposed by Baker (2007) and Dabaghi and Der Kiureghian (2017).…”

Section: Seismic Risk Assessment At Near-fault Sitesmentioning

confidence: 99%

Near-fault seismic risk assessment of simply supported bridges

et al. 2020

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Bridges tend to sustain excessive seismic demand (e.g. displacement) under pulse-like ground motions attributing to the effect of forward directivity, which is of high likely to occur at locations near the fault rupture. This study tries to incorporate the pulse effect into the probabilistic seismic hazard analysis (PSHA) and probabilistic seismic demand analysis (PSDA) framework, which are combined to quantify the risk of earthquake-induced damage in the near-fault location. The near-fault PSDA and PSHA are established and connected conditioned on peak ground velocity (PGV). Four sets of typical simply supported bridge types with the varying heights, representing the range of the period, are simulated by taking account the strength and stiffness degradation associated with material and geometry nonlinearity. The detailed investigation of the near-fault seismic risk is performed for these bridge models located at representative near-fault sites namely 5, 10, 15, and 20 km, respectively. The results reveal that near-field directivity effect strongly impacts the bridge damage risk with the observation of higher risk at the closer site; the bridges with the period of approximately Tp/2(pulse period) tend to experience the highest seismic risk, and the relative vulnerability of four bridge types is also compared.

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Section: Seismic Risk Assessment At Near-fault Sitesmentioning

confidence: 99%

Near-fault seismic risk assessment of simply supported bridges

et al. 2020

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“…Selection of an approximate IM plays a vital role in the probabilistic demand seismic models, which provides the link between EDPs and IMs. An optimal IM should satisfy the following five requirements [1,7].…”

Section: Characteristics Of An Optimal Immentioning

confidence: 99%

“…A sufficient IM is statistically independent of ground motion characteristics, such as the magnitude (M), the epicentral distance (R), and fault characteristics. e sufficiency of IMs is assessed with a regression analysis on the residual ε/IM to obtain the corresponding p value, from the PSDM to the ground motion characteristics, M or R [1]. A larger p value of the regression evaluation indicates a more sufficient IM.…”

Section: Proficiency: a Composite Metric Of Efficiency Andmentioning

confidence: 99%

“…It has been observed that ground motion recordings in the near-fault region, which is usually taken as within 20 km from the fault rupture, tend to differ from far-field rivals in three main characteristics, that is, velocity pulse, directivity effect, and large vertical acceleration component [1]. Some of these differences are usually shown in the velocity and displacement time series, which have been attributed to two effects: the rupture directivity effect and the fling step.…”

Section: Introductionmentioning

confidence: 99%

“…Li et al [17] proposed two fuzzy-valued (F V ) structure-specific intensity measures (one is based on the squared spectral velocity and the other is based on the inelastic spectral displacement) to characterize near-fault pulse-like ground motions. Zhong et al [1] investigated the response of cable-stayed bridges under synthetic and recorded pulse-like ground motions and found that PGV tends to be the optimal intensity measure compared to other six structure-independent IMs.…”

Section: Introductionmentioning

confidence: 99%

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Optimal Seismic Intensity Measure Selection for Isolated Bridges under Pulse‐Like Ground Motions

Jiang

Zhong

et al. 2019

Advances in Civil Engineering

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Isolated bridges are commonly designed in the near-fault region to balance excessive displacement and seismic force. Optimal intensity measures (IMs) of probabilistic seismic demand models for isolated bridges subjected to pulse-like ground motions are identified in this study. Four typical isolated girder bridge types with varied pier height (from 4 m to 20 m) are employed to conduct the nonlinear time history analysis. Totally seven structure-independent IMs are considered and compared. Critical engineering demand parameters (EDPs), namely, pier ductility demands and bearing deformation along the longitudinal and transverse directions, are recorded during the process. In general, PGV tends to be the optimal IM for isolated bridges under pulse-like ground motions based on practicality, efficiency, proficiency, and sufficiency criterions. The results can offer effective guidance for the optimal intensity measure selection of the probabilistic seismic demand models (PSDMs) of isolated bridges under pulse-like ground motions.

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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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Optimal Intensity Measures in Probabilistic Seismic Demand Models of Cable-Stayed Bridges Subjected to Pulse-Like Ground Motions

Cited by 96 publications

References 23 publications

Near-fault seismic risk assessment of simply supported bridges

Near-fault seismic risk assessment of simply supported bridges

Optimal Seismic Intensity Measure Selection for Isolated Bridges under Pulse‐Like Ground Motions

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

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