Effects of Near Fault and Far Fault Ground Motions on Nonlinear Dynamic Response and Seismic Improvement of Bridges

Hajali, Mohammad; Jalali, Abdolrahim; Maleki, Ahmad

doi:10.28991/cej-0309186

Cited by 7 publications

(4 citation statements)

References 7 publications

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“…The response of the Sutong Cable stayed bridge with the forward directivity with fling step ground motions and the artificial pulses near-fault pulse-type ground motions were studied by the researchers and the results shows that the fling step ground motions which have low PGV/PGA, enforce larger deformation and internal forces over the structure than the forward directivity motions (fig. 5) (Li et al, 2017;Hajali et al, 2018).…”

Section: Effect Of Near-fault Earthquake On Bridge Structuresmentioning

confidence: 99%

The High-Speed Railway Bridges Under Vehicle Moving Load And Near Fault Seismic Ground Motions – Review.

Vijayakumar

Qian

2021

J. build. mater. struct.

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All-time needs of maintenance of high-speed train system and its infrastructure safety are must all over the world. Nowadays, for the smooth running of HSR trains, most of the country depends on the HSR bridge structures, but there is still a lack of understanding of the behavior of structures under various factors like seismic and high speed moving load effects. To study the dynamic behavior of HSR bridges, it is important to consider the interaction of moving vehicle – Bridge structure – Ground surface showing that the different parameters involved in understanding the response of the structure. The main motivation of this study is to initiate a better understanding of the various parameters effects by those seismic and moving vehicles over the dynamic behavior of the HSR bridges. The effects of forwarding directivity pulses were considered to understand the behavior of HSR bridges against near-fault earthquakes, which can make a substantial impact on the seismic demand capacity of the moving vehicles and structures. The effects of high-speed moving vehicles over the HSR bridges to understanding the parameters involved in the dynamic behavior of the coupled system. This literature review can help the beginners and who initiate the study based on the dynamic behavior of high-speed railway bridges and their components under seismic and moving load effects.

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Section: Effect Of Near-fault Earthquake On Bridge Structuresmentioning

confidence: 99%

The High-Speed Railway Bridges Under Vehicle Moving Load And Near Fault Seismic Ground Motions – Review.

Vijayakumar

Qian

2021

J. build. mater. struct.

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“…The seismic response of a near-fault ground motion differs significantly from far-fault earthquakes (Akkar et al, 2005;Adanur et al, 2012). NFGM exposes structures to a large amount of energy at the start of the earthquake due to a large velocity pulse, resulting in an increase in structural responsiveness with considerable structural damage (Liao et al, 2004;Davoodi et al, 2013;Hajali et al, 2018). It has been observed that in comparison to half-wave signals, a pulse including a full-wave signal causes severe structural damage (Reddy et al, 2011).If the pulse velocity's Time Period (T p ) is longer than the structure's fundamental Time period (T 1 ), the structure's seismic demand in the elastic range increases.…”

Section: Introductionmentioning

confidence: 99%

Influence of near-fault ground motion characteristics and the relative geographical positioning of sites on the seismic response of RC structures

Wani

Vemuri

Chenna³

2023

IJSI

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PurposeThe objective of the study is to examine the response of reinforced concrete (RC) structures subjected to Near-Fault Ground Motions (NFGM) and highlight the importance of considering various factors including the influence of the relative geographical position of near-fault sites that can affect the structural response during an earthquake.Design/methodology/approachIn this paper, the response of a four-storey RC building subjected to NFGMs with varied characteristics like hanging wall and footwall in conjunction with directivity and the effect of pulse-like ground motions with rupture direction are investigated to understand the combined influence of these factors on the behavior of the structure. Furthermore, the capacity and demand of the structural element are investigated for computing the performance ratio.FindingsResults from this study indicate that the most unfavorable combinations for structural damage due to near-fault ground motion are the hanging wall with forward rupture, the fault normal component of ground motions, and pulse-like ground motions with forward directivity.Originality/valueThe results from this study provide valuable insight into the response of RC structures subjected to NFGM and highlight the importance of considering various factors that can affect the structural response during an earthquake. Moreover, the computation of capacity and demand of the critical beam indicates exceedance of desired limits, resulting in the early deterioration of the structural elements. Finally, the analytical analysis from the present study confirms that the hanging wall with forward ruptures, pulse-like motions, and fling steps are the most unfavorable combinations for seismic structural damage.

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“…The velocity pulse effect and the high-frequency vibration are the main characteristics of near-fault earthquakes. Several scholars have studied the influence of the velocity pulse on the structural response, finding that the velocity pulse effect usually causes a larger response than the non-pulse far-field earthquake (Hajali et al, 2018; Jalali et al, 2012; Süleyman et al, 2012; Wu et al, 2014; Xin et al, 2019; Yan and Chen, 2015; Zhang et al, 2018), but most scholars pay attention to long-period structures such as high-rise buildings and large-span structures, it has been found in their researches that the velocity pulse plays a controlling role on the seismic response of these long-period structures, while the high-frequency vibration has little effect. Furthermore, it shows that the seismic response of structure under the near-fault earthquake is associated with the structural period.…”

Section: Introductionmentioning

confidence: 99%

Seismic damage features of high-speed railway simply supported bridge–track system under near-fault earthquake

Guo

Gao

et al. 2020

Advances in Structural Engineering

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Seismic loads pose a potential threat to the high-speed railway bridges in China, which have been rapidly developing in recent years, especially for those subjected to the near-fault earthquakes. The previous researches on high-speed railway bridges usually concern the far-field earthquake, and the damage of high-speed railway bridge–track system subjected to the near-fault earthquake has not been well studied. In this article, a seven-span high-speed railway simply supported bridge–track system is selected to explore the seismic damage features under the excitation of near-fault earthquake which possesses characteristics of obvious velocity pulse and high-frequency vibration. First, a detailed finite element model of the selected bridge–track system is established and calibrated by the experimental data and design code. Then the low-frequency pulse-type portion and the high-frequency background portion are separated from the selected eight original near-fault records, and a series of nonlinear dynamic analysis is conducted. The results show that the background portion leads to more serious damage of the bridge–track system than the pulse-type portion. Due to the high stiffness of high-speed railway bridge–track system, the background portion with high-frequency vibration characteristic produces the main part of seismic response of system. As for the damage part of system, the weakest component of the bridge–track system is the sliding layer, followed by the shear alveolar.

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Effects of Near Fault and Far Fault Ground Motions on Nonlinear Dynamic Response and Seismic Improvement of Bridges

Cited by 7 publications

References 7 publications

The High-Speed Railway Bridges Under Vehicle Moving Load And Near Fault Seismic Ground Motions – Review.

The High-Speed Railway Bridges Under Vehicle Moving Load And Near Fault Seismic Ground Motions – Review.

Influence of near-fault ground motion characteristics and the relative geographical positioning of sites on the seismic response of RC structures

Seismic damage features of high-speed railway simply supported bridge–track system under near-fault earthquake

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