Seismic response of highway viaducts equipped with lead-rubber bearings under low temperature

Deng, Pengru; Gan, Zhiping; Hayashikawa, Toshiro; Matsumoto, Takashi

doi:10.1016/j.engstruct.2019.110008

Cited by 23 publications

(11 citation statements)

References 29 publications

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“…In their study, LRBs were modeled with two different non-deteriorating bilinear force-displacement curves to idealize hysteretic behavior of LRBs at "summer" (25°C) and "winter" (-30°C) with properties provided by manufacturer. Another study that has focused on seismic response of LRB isolated bridge under low temperatures was conducted by Deng et al [22]. Similarly, in the analytical model, they used a non-deteriorating hysteretic representation for LRBs where stiffness and strength of LRB was modified in accordance with an empirical formulation.…”

Section: Introductionmentioning

confidence: 99%

Modification in Response of a Bridge Seismically Isolated with Lead Rubber Bearings Exposed to Low Temperature

2022

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This study investigates the response modification in a bridge seismically isolated with lead rubber bearings (LRBs), due to change of ambient temperature from 20 o C to -30 o C. Accordingly, a large-size LRB was tested after being conditioned at corresponding temperatures and changes in its hysteretic properties were noted. Use of analytical tool in modeling nonlinear response of the tested LRB was justified by comparing the experimentally observed and analytically obtained force-displacement curves. Then, verified analytical representation of an LRB was employed in nonlinear response history analyses conducted to quantify the change in response of a representative LRB isolated bridge when subjected to bidirectional ground motion excitations at 20°C and -30°C. Analyses results are also employed to assess the use of property modification factor, , to change isolator properties in order to represent low temperature behavior. It is revealed that for the selected ground motion records, the average isolator force remains almost the same for both ambient temperatures. Moreover, using property modification factor will result in accurately estimated isolator displacements, but overestimated isolator forces, in an average sense.

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Section: Introductionmentioning

confidence: 99%

Modification in Response of a Bridge Seismically Isolated with Lead Rubber Bearings Exposed to Low Temperature

2022

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“…e California DOT and Illinois DOT analyzed the key design factors which affect the seismic performance of LRBs supported bridge, and the conclusion revealed that seismic motion intensity, pier height, and bearing type are the keys which affect the isolation system performance [11,12]. Deng et al and Billah et al compared the impact of geometric parameters of the bearing and vertical load on the bridge seismic response by using FEM (finite element method) to model the rubber bearing supported bridge [13,14]. Mitoulis et al studied the influence on the characteristics of steel plate on the performance of rubber bearing under the combined effects of shear, rotation, and axial load [15,16].…”

Section: Introductionmentioning

confidence: 99%

Seismic Response Analysis and Evaluation of Laminated Rubber Bearing Supported Bridge Based on the Artificial Neural Network

Zhang

Wang

et al. 2021

Shock and Vibration

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Laminated rubber bearings are commonly adopted in small-to-medium span highway bridges in earthquake-prone areas. The accurate establishment of the mechanical model of laminated rubber bearings is one of most critical steps for the bridge seismic response analysis. A new constitutive model of bearing based on the artificial neural network (ANN) technique is established through the static cyclic test of laminated rubber bearings, considering the bearing initial stiffness, friction coefficient, and other parameters such as the bearing sectional area, height, loading velocity, vertical load, and aging time. Combined with the ANN method, the ANN-based bridge seismic demand model is built and applied to the rapid evaluation of the bridge seismic damage. The importance of the bearing affecting design factors in the bridge seismic demands are ranked. The results demonstrated that the dimensions of the bearing and vertical load are the main factors affecting the bearings constitutive model. Based on the partial dependency analysis with the ANN-based bridge seismic demand model, it is concluded that the height of bearing is the key design parameter which affects the bridge seismic response the most. The ANN seismic demands model can fit the complex function relationship between various factors and bridge seismic response with high precision, so as to achieve the rapid evaluation of bridge seismic damage.

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“…In their study, LRBs were modeled with two different non-deteriorating bilinear force-displacement curves to idealize hysteretic behavior of LRBs at "summer" (25°C) and "winter" (-30°C) with properties provided by manufacturer. Another study that has focused on seismic response of LRB isolated bridge under low temperature was conducted by Deng et al [19]. Similarly, in the analytical model, they used a non-deteriorating hysteretic representation for LRBs where stiffness and strength of LRB was modified in accordance with an empirical formulation.…”

Section: Introductionmentioning

confidence: 99%

“…LRB properties used in the analyses were computed for temperatures changing from -30°C to 40°C. However, it is to be mentioned that both Billah and Todorov [18] and Deng et al [19] neglected the deterioration in strength of LRBs due to temperature rise in the lead core under cyclic motion. Thus, presented results are based on bounding analyses where hysteretic properties such as strength and stiffness of LRB do not change during the applied motion.…”

Section: Introductionmentioning

confidence: 99%

Variation in Response of a Bridge Seismically Isolated With LRBS Under the Effect of Low Ambient Temperature

Çavdar¹,

Karuk²,

Ozdemir³

2021

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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In this paper, the change in response parameters of a seismically isolated bridge, namely maximum isolator displacement (MID) and shear force (MSF), is studied when the ambient temperatures drops to (-30⁰C) from 20⁰C. Isolation system of the analyzed bridge is assumed to be composed of lead rubber bearings (LRBs). First, the LRB was subjected to cyclic loading after a conditioning period of 24 hours at both temperatures. Test results were used to validate the success of analytical model used to idealize the deteriorating hysteretic behavior of the LRB. Then, verified analytical representation of LRB was utilized in nonlinear response history analyses in order to measure the variation in MID and MSF in the bridge model under the effect of bidirectional seismic excitations at 20⁰C and -30⁰C. Two distinct group of ground motions, that constitute characteristics of both near-field and largemagnitude-small-distance records, were used in the analyses. Results showed that MIDs obtained for LRB properties of 20 o C are about 20% larger than the ones obtained for -30 o C, in an average sense. Furthermore, average MSF obtained for near-field ground motions at 20 o C and -30 o C are identical. However, for large-magnitude-small-distance ground motions, MSF of -30 o C is almost 25% larger than that of 20 o C.

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Seismic response of highway viaducts equipped with lead-rubber bearings under low temperature

Cited by 23 publications

References 29 publications

Modification in Response of a Bridge Seismically Isolated with Lead Rubber Bearings Exposed to Low Temperature

Modification in Response of a Bridge Seismically Isolated with Lead Rubber Bearings Exposed to Low Temperature

Seismic Response Analysis and Evaluation of Laminated Rubber Bearing Supported Bridge Based on the Artificial Neural Network

Variation in Response of a Bridge Seismically Isolated With LRBS Under the Effect of Low Ambient Temperature

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