Behavior of Elastomeric Bridge Bearings: Computational Results

Hamzeh, Osama N.; Tassoulas, John L.; Becker, Eric B.

doi:10.1061/(asce)1084-0702(1998)3:3(140)

Cited by 18 publications

(6 citation statements)

References 6 publications

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“…44 Considering this factor can further validate the effectiveness of dynamic indexes and their ability to integrate bearing disengagement information, which has not been adjusted in this article. (2) The reduction in natural frequencies in the case of multiple bearings disengagement was greater than that in the case of single bearing disengagement. Therefore, the damage has a cumulative effect on the reduction in NF.…”

Section: Experimental Results and Analysismentioning

confidence: 88%

“…As shown in the comparison between (b) and (a) in Figure 6, it can be seen a significant numerical difference in the second mode order vibration mode at bearing 1 which was disengaged. (2) In addition, the change in the vibration modes caused by the disengagement of bearings was not only a local change, at the same time, it also had an impact on the amplitude change of vibration modes in other areas. As shown in the comparison between (h) and (e) in Figure 5, it can be also seen a significant difference in the third mode order vibration mode at bearing 2 in Job8, not only at disengagement bearings 1 and 3.…”

Section: Experimental Results and Analysismentioning

confidence: 99%

“…Bridge bearings play an important role in transmitting force and displacement, and in the safety and service life of the overall bridge, as a component connecting the superstructure and substructure of a bridge. 1,2 However, bridge bearings are prone to cracking, deformation and displacement, disengagement, and other diseases due to defects in the material performance, the uncoordinated working environment, the concrete shrinkage and creep, the change in ambient temperature, the uneven contact surface among the parts of bridges, the uneven settlement of the foundation, and other reasons. [3][4][5] The bridge bearing diseases seriously affect the mechanical characteristics of the bridge and endanger the safety of pedestrians.…”

Section: Introductionmentioning

confidence: 99%

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Bridge-bearing disengagement identification based on flexibility matrix diagonal matrix change rate: an indoor physical simulation experiment

Ma,

Qiao,

2023

Structural Health Monitoring

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The disengagement of bridge bearings is a pervasive issue encountered in the realm of bridges, which can potentially lead to changes in operational circumstances, diminished longevity, and compromised traffic safety. The current methods employed for detecting such disconnections primarily rely on force sensors, cameras, and acceleration sensors. However, their practical implementation on-site and effectiveness in accurately identifying disengagement require enhancement. To address the challenges associated with the installation and layout of conventional contact sensors, as well as the potential introduction of additional mass, a sophisticated “bridge-bearing disconnection detection system” has been devised. This innovative system is based on laser Doppler vibrometer technology, which eliminates the need for physical contact. The feasibility of employing non-contact laser Doppler vibration measurement technology in the detection of bridge-bearing disconnection has been successfully verified within the framework of this study. Furthermore, a comprehensive analysis of the sensitivity of key dynamic parameters, specifically natural frequencies and vibration modes, to bridge-bearing disengagement has been conducted. The verification process included evaluating the identification effectiveness of regularized combined absolute changes in vibration modes and flexibility matrix diagonal matrix change rate (FDMCR) under diverse working conditions simulating complete disconnection. This assessment involved using both finite element analysis and empirical measurements. The findings unequivocally demonstrate that the disconnection of bridge bearings results in a reduction in the natural frequencies for each mode order, with an observed cumulative effect. In addition, it is noteworthy that the vibration mode indices typically exhibit greater sensitivity toward the disconnection of outer bearings. By contrast, FDMCR demonstrates commendable positioning capabilities and exceptional noise resistance in identifying bridge-bearing disengagement. The empirical insights gleaned from these research findings hold significant value in terms of on-site identification of bridge-bearing disengagement, ultimately contributing to the preservation of bridges’ long-term operational integrity.

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Section: Experimental Results and Analysismentioning

confidence: 88%

Section: Experimental Results and Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Bridge-bearing disengagement identification based on flexibility matrix diagonal matrix change rate: an indoor physical simulation experiment

Ma,

Qiao,

2023

Structural Health Monitoring

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“…Finite element studies of laminated elastomeric bearings have been conducted in the past [13][14][15][16][17][18][19]. Most of the previous analyses were on two-dimensional models.…”

Section: Complementary Finite Element Analysismentioning

confidence: 99%

Analysis of specimen size effects in inclined compression test on laminated elastomeric bearings

Topkaya

2004

Engineering Structures

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“…Considering the nonlinear characteristic, Hamzeh et al established a 2D finite element model of the rubbing bearing. Adopting this model, the influence factors of bearing stresses and strains were analyzed, and the relationship between the lateral deformation and vertical deformation of the bearing was also obtained [2]. Moreover, many existing works investigate the influences of bearings without damage on the vibrations of bridge systems.…”

Section: Introductionmentioning

confidence: 99%

Damage Model of Bridge Bearing and Its Influence on Train-Track-Bridge Dynamic System

CHEN

2022

mech

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Bridge bearing damage is unavoidable in railway engineering. This work presents an investigation on the damage model of bridge bearing and its influence on the dynamic responses of the high-speed train-track-bridge system. Primarily, the mathematical description of bridge bearing damage model is explained in detail, which is then compared with the traditional linear model. Then a 3D train-track-bridge dynamic model considering bearing damage is established based on the train-track-bridge dynamic interaction theory. Adopting the model, the influences of single-point-damage and multi-point-damage on the dynamic behaviors of the coupled system are deeply investigated. Results show that the calculated obtained by the proposed model and the traditional linear model are different, especially in frequency-domain. Compared to results of traditional linear model, the results obtained by the proposed model are smaller due to the additional damping effect. Bridge bearing damage has almost no influence on the train vibrations, while has great effect on bridge vibrations. The damage in z-direction mainly affects the vertical vibrations, while damage in y-direction mainly influences the lateral vibrations. Among all the damaged bearings in this work, the influence of damage in x-direction has the least influence on the system. The damage in the fixed bearing is larger than that in other bearings, indicating that more attentions should be paid to the health monitoring of fixed bearings in railway engineering.

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Behavior of Elastomeric Bridge Bearings: Computational Results

Cited by 18 publications

References 6 publications

Bridge-bearing disengagement identification based on flexibility matrix diagonal matrix change rate: an indoor physical simulation experiment

Bridge-bearing disengagement identification based on flexibility matrix diagonal matrix change rate: an indoor physical simulation experiment

Analysis of specimen size effects in inclined compression test on laminated elastomeric bearings

Damage Model of Bridge Bearing and Its Influence on Train-Track-Bridge Dynamic System

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