The development of a multi-level unseating prevention device (MLUPD) for bridges

Hamzah, Mustafa Kareem; Hejazi, Farzad

doi:10.1016/j.istruc.2020.05.011

Cited by 8 publications

(3 citation statements)

References 17 publications

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“…Implementation of restrainers or dampers in bridges for improving lateral resistance, ductility and unseating prevention without scarifying the overall integrity of bridges is one of the most effective techniques that can guarantee the structural safety of bridges. Recently, different researches have been conducted to examine the impact of implementing different types of damping systems in the bridge to control the bridge movement under applied loads [6,7]. Numerical simulations and experimental testing have widely been performed on restrainers, dampers and bridges equipped with these devices [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Development of adjustable variable stiffness restrainer for bridge subjected to seismic excitation

Hamzah

Hejazi

2023

PLoS ONE

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This paper presents a numerical and experimental assessment of a developed adjustable variable stiffness restrainer (AVSR) utilized for short span bridges. This restrainer has the ability to demonstrate multi stiffness capacity in different stages of bridge’s superstructure movement to mitigate the severe damage of bridge due to an earthquake. The multi-level stiffness behavior of developed AVSR is achieved by using multiple mechanical springs with different lengths and placed in parallel in proposed design. A small prototype of developed AVSR has been fabricated and tested under incremental and cyclic loading in order to assess the restrainer performance and the behavior has been validated using finite element analysis. Thereafter, the constitutive model of AVSR was derived for the proposed restrainer in order to implement it in numerical simulations. Furthermore, a parametric study has been conducted numerically to evaluate the effectiveness of different parameters on the restrainer capacity. Moreover, the efficiency of AVSR application in a single degree of freedom system has been assessed by performing seismic analysis on a frame equipped with AVSR subjected to different seismic excitations using Newmarkʼs method. The experimental and finite element results proved the efficiency of developed variable stiffness device to exhibit adjustable action against imposed loads in three designed stages. Furthermore, the parametric study results revealed that increasing the section area of the spring wire leads to increase the restrainer capacity. In contrast, the restrainer resistance is declined by an increase in the mean spring diameter and number of coils for each spring of AVSR. The time history analysis results also indicated that the frame response in terms of displacement, velocity and acceleration is improved by implementing the AVSR in the considered system.

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Section: Introductionmentioning

confidence: 99%

Development of adjustable variable stiffness restrainer for bridge subjected to seismic excitation

Hamzah

Hejazi

2023

PLoS ONE

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“…However, external technologies are more widely used to overcome bridge unseating and they can be stiffness dependant, velocity dependent and energy absorption devices [7][8][9]. The yielding dampers are the most widely used devices since they are cost effective, simple structure, dissipate ground motion energy and the material is available [10].…”

Section: Introductionmentioning

confidence: 99%

Numerical Performance of Energy Dissipation Slotted Plate for Bridge Unseating Prevention

Hamzah

Hejazi

2022

IOP Conf. Ser.: Earth Environ. Sci.

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Recently, the bridge unseating prevention devices are widely used in active seismic zones. These devices are stiffness dependant, velocity dependant and energy dissipation devices. The energy dissipation devices are designed to overcome the energy that transfers from bridge substructure to superstructure. However, the current devices are not controlled to function with different ground motion intensities and should be replaced after yielding. Therefore, this research introduced a slotted plate energy dissipation device with three parts, each part function in known deformation range. The slotted plate behavior has been evaluated numerically by finite element method. Displacement control and load control analysis has been done, and then the effect of steel grade is studied to predict the suitable steel properties for designing the plate. Moreover, the slotted plate behavior is applied in 3D bridge seismic analysis to assess the multi-level performance and the ability to overcome the seismic effect on the bridge in longitudinal direction. The results approved the capability of the plate to dissipate energy in multi-stage of deformation. The lower steel grade is suitable for low to moderate earthquake zone and the high grade can be used in severe ground motion areas. Furthermore, the bridge longitudinal behavior has enhanced with different steel grades of the slotted plate.

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“…Further, the underestimation of track constraints makes the effect of some isolation devices not substantially different between Railway Bridges and Highway Bridges and thus rarely investigated in HSRSB, such as unseating prevention devices. The unseating prevention device, which is used to prevent adjacent girder pounding and girder falling, has been extensively studied in seismic analysis of highway Bridges [25][26][27] . However, in the HSRSB, the bridge-track-subgrade interaction may change the isolation effect of unseating prevention devices, which cannot be detected in the study of Highway Bridge.…”

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confidence: 99%

Control of Difference of Seismic Response across Different Spans of high-speed railway multi-spans simply supported bridge

Zhang

Jiang

Zhou

et al. 2022

Bull Earthquake Eng

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In this paper, the Difference of Seismic Response across Different Spans (DSR) in the longitudinal distribution of High-Speed Railway Multi-spans Simply Supported Bridge (HSRSB) under longitudinal earthquake excitation is investigated, and an evaluation method which can intuitively reflect the difference of seismic response is proposed. A feasible way to strengthen the connection stiffness between adjacent girders is proposed to control DSR. The rationality of the finite element model used is verified by comparing the numerical results with the experimental ones, showing a satisfactory agreement. Comparing the seismic response of a bridge model considering the subgrade-track constraints (BCTM) and a bridge model without subgrade-track constraints (BWTM), it is found that the DSR in the longitudinal distribution causes some new disadvantages, which are neglected in BWTM. The BCTM considering DLC generates a model called BCDM. The effect of the number of span on DSR are studied based on BCDM. The analysis of this model showed that DLC suppresses the DSR and reduces the seismic response of most bridge components. It also transfers the seismic disadvantage from the bridge part to the subgrade-track structure. As it is more convenient and cost-effective to repair the base plate of the subgrade than the bridge components after earthquake seismic event, this disadvantage transfer is in favor of forming a new anti-seismic system that subgrade-track structure is used to protect the bridge part.

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The development of a multi-level unseating prevention device (MLUPD) for bridges

Cited by 8 publications

References 17 publications

Development of adjustable variable stiffness restrainer for bridge subjected to seismic excitation

Development of adjustable variable stiffness restrainer for bridge subjected to seismic excitation

Numerical Performance of Energy Dissipation Slotted Plate for Bridge Unseating Prevention

Control of Difference of Seismic Response across Different Spans of high-speed railway multi-spans simply supported bridge

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