Role of Structural Details in Altering the Expected Seismic Response of Base-Isolated Bridges

Chaudhary, Muhammad Tariq A.; Abé, Masato; Fujino, Yozo

doi:10.1006/mssp.2002.1480

Cited by 12 publications

(8 citation statements)

References 7 publications

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“…At low strain levels experienced by the bearings due to low amplitude ambient and earthquake-induced excitations, their secant stiffness is much higher than the one at the significantly much higher strain levels associated with the design of the bearings for the strong design earthquakes prescribed by the seismic code. These large differences of the elastomeric bearings stiffnesses between the identified and the design ones are also consistent with the results obtained by Chaudhary et al (2002) for base-isolated bridges and by Stewart et al (1999) for base-isolated buildings. Qualitatively similar results are observed for the bearing stiffness values in Table 3 for the Kavala bridge, although these values are significantly higher than those identified for the Polymylos bridge.…”

Section: Kavala Bridgessupporting

confidence: 89%

“…Extensions for identifying non classically-damped modal models in the frequency domain has also been developed by Chaudhary et al (2000). These methods have been applied to identify the modal characteristics of bridges (Werner et al 1987;Chaudhary 2002) and buildings (Papageorgiou and Lin 1989) by processing input-output earthquake recordings.…”

Section: Introductionmentioning

confidence: 99%

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Structural identification of Egnatia Odos bridges based on ambient and earthquake induced vibrations

Ntotsios

Karakostas

Lekidis

et al. 2008

Bull Earthquake Eng

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Abstract:The dynamic characteristics of two representative R/C bridges on Egnatia Odos motorway in Greece are estimated based on low amplitude ambient and earthquake-induced vibrations. The present work outlines the instrumentation details, algorithms for computing modal characteristics (modal frequencies, damping ratios and modeshapes), modal-based finite element model updating methods for estimating structural parameters, and numerical results for the modal and structural dynamic characteristics of the two bridges based on ambient and earthquake induced vibrations. Transverse, bending and longitudinal modes are reliably identified and stiffness-related properties of the piers, deck and elastomeric bearings of the finite element models of the two bridges are estimated. Results provide qualitative and quantitative information on the dynamic behavior of the bridge systems and their components under low-amplitude vibrations. Modeling assumptions are discussed based on the differences in the characteristics identified from ambient and earthquake vibration measurements. The sources of the differences observed between the identified modal and structural characteristics of the bridges and those predicted by finite element models used for design are investigated and properly justified.

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Section: Kavala Bridgessupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Structural identification of Egnatia Odos bridges based on ambient and earthquake induced vibrations

Ntotsios

Karakostas

Lekidis

et al. 2008

Bull Earthquake Eng

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“…temperature and humidity variations (Alampalli, 2000;Xia et al, 2012) and unintentional locking of bridge components (bearings, side stoppers, expansion joints) due to lack of maintenance or fabrication errors etc. (Chaudhary et al 2002;Maalek et al, 2010). Similarly, soil-structure interaction (SSI) (Fraino et al, 2012;Gomez et al, 2013;Chaudhary 2017a), scour around foundations (Ju, 2013;Bao & Liu, 2017), support settlement or liquefaction can change the boundary conditions and impact the modal parameters of the bridge system (Catbas & Aktan, 2002;Lombardi & Bhattacharya, 2014).…”

Section: Introductionmentioning

confidence: 99%

Sensitivity of modal parameters of multi-span bridges to SSI and pier column inelasticity and its implications for FEM model updating

Chaudhary

2020

Lat. Am. j. solids struct.

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Modal parameters, determined through forced vibration testing, ambient vibrations or seismic excitations, are central to the structural health monitoring process for bridges. These parameters are used to obtain highfidelity numerical models through FEM model updating by fine-tuning mass, stiffness and boundary conditions and matching the numerical and observed modal parameters. This study investigated sensitivity of modal parameters to changes in boundary conditions (soil-structure interaction effect) and pier column inelasticity (stiffness effect) through more than 450 non-linear dynamic time-history analysis of an ordinary multi-span bridge. The bridge system was founded on shallow foundations in five rock profiles and on pile foundations in five soil profiles and was subjected to 21 seismic ground motions of varying intensity (0.036 to 0.61g). Modal frequencies showed sensitivity to the SSI and pier column inelasticity effects for low and higher levels of seismic excitations respectively. Mode shapes, on the contrary, were insensitive to SSI as well as pier column inelasticity for all levels of seismic excitations.

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“…Nonetheless, secondary components such as rubber bearings, hinge restrainers, side stoppers, and expansion joints if not well taken care of are likely to result in undesirable overall performance of a bridge structure during extreme quake events [2].…”

Section: Introductionmentioning

confidence: 99%

“…Fix-type bearings may break loose if their hinge-restrainer device is sheared off by lateral seismic loading. New techniques in the form of an isolator or a damper device are introduced to replace or enhance conventional bearings [2,3].…”

Section: Introductionmentioning

confidence: 99%

Failure study of a bridge subjected to pounding and sliding under severe ground motions

Wang

2007

International Journal of Impact Engineering

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Role of Structural Details in Altering the Expected Seismic Response of Base-Isolated Bridges

Cited by 12 publications

References 7 publications

Structural identification of Egnatia Odos bridges based on ambient and earthquake induced vibrations

Structural identification of Egnatia Odos bridges based on ambient and earthquake induced vibrations

Sensitivity of modal parameters of multi-span bridges to SSI and pier column inelasticity and its implications for FEM model updating

Failure study of a bridge subjected to pounding and sliding under severe ground motions

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