Surface Generation of Asynchronous Seismic Signals for the Seismic Response Analysis of Bridges

Lavorato, Davide; Fiorentino, Gabriele; Bergami, Alessandro Vittorio; Ma, Hui; Nuti, Camillo; Briseghella, Bruno; Vanzi, Ivo; Zhou, Weidong

doi:10.7712/120117.5560.18098

Cited by 8 publications

(17 citation statements)

References 31 publications

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“…These signals were obtained starting from the EW accelerometric components of the main shock recorded at two recording stations (AQA, AQV) near L'Aquila city (Italy) on 4-06-2009 [11]. The soil motion below each foundation is along the direction y in Figure 1; this direction is perpendicular to the bridge deck and so the bridge behavior was studied in this direction only ( §4).…”

Section: Asynchronous and Synchronous Actions On The Bridgesmentioning

confidence: 99%

“…The displacement histories, calculated by means of the software Seismosignal [39] starting from the accelerograms generated in [11], were selected to represent the seismic actions applied on the two selected bridges (non-isolated and isolated) to perform asynchronous and synchronous analyses ( §4). These signals were obtained starting from the EW accelerometric components of the main shock recorded at two recording stations (AQA, AQV) near L'Aquila city (Italy) on 4-06-2009 [11].…”

Section: Asynchronous and Synchronous Actions On The Bridgesmentioning

confidence: 99%

“…Different arrays of asynchronous seismic signals were generated considering the three bridge locations starting from the same inputs. Each generation uses a different random extraction to considered statistical variability of the generated signals [11].…”

Section: Introductionmentioning

confidence: 99%

“…The generation procedure [6,7,[23][24][25][26][27][28][29][30][31][32][33][34][35][36][37] used to obtain the input displacement histories at the bridge foundation points was discussed in Lavorato et al [11]. This procedure was implemented in MATLAB [38] as a framework of functions named GAS 2.0 -Generation of Asynchronous Signals -.…”

Section: Introductionmentioning

confidence: 99%

“…Designers of long structures should take in account these differences to define with attention the asynchronous design actions which can be more detrimental than the synchronous ones [1][2][3][4][5][6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Seismic Behaviour of Isolated Rc Bridges Subjected to Asynchronous Seismic Input

Lavorato¹,

Bergami²,

Rago³

et al. 2017

Proceedings of the 6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Section: Asynchronous and Synchronous Actions On The Bridgesmentioning

confidence: 99%

Section: Asynchronous and Synchronous Actions On The Bridgesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Seismic Behaviour of Isolated Rc Bridges Subjected to Asynchronous Seismic Input

Lavorato¹,

Bergami²,

Rago³

et al. 2017

Proceedings of the 6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

Self Cite

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A method for linear response analysis of long bridges under multi-support seismic excitation

Parvanehro

Shiravand²,

Safi³

2022

Bull Earthquake Eng

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Simplified design of bridges for multiple-support earthquake excitation

Papadopoulos

Sextos

2020

Soil Dynamics and Earthquake Engineering

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This paper presents a novel, bridge-dependent approach for quantifying the increase of design quantities due to spatially variable earthquake ground motion (SVEGM). Contrary to the existing methods for multiple support bridge excitation analysis that are either too complicated to be applied by most practitioners or oversimplied (e.g. Eurocode 8, Annex D provisions), this method aims to strike a balance between simplicity, accuracy and computational efficiency. The method deliberately avoids generating support-dependent, acceleration or displacement, asynchronous inputs for the prediction of bridge response. The reasons behind this decision are twofold: (a) first, the uncertainty associated with the generation of asynchronous motion scenarios, as well as the exact soil properties, stratification and topography is high while, (b) the response of a bridge is particularly sensitive to the above due to the large number of natural modes involved. It is therefore prohibitive to address SVEGM effects deterministically in the framework of a design code. Instead, this new method is based on two important and well-documented observations: (a) that SVEGM is typically globally beneficial but locally detrimental [1], and (b) that the local seismic demand increase is very closely correlated with the excitation of higher modes, which are not normally activated in the case of uniform ground motion [2,3]. Along these lines, a set of static analyses are specified herein to complement the standard, code-based response spectrum analysis. These static analyses apply spatially distributed lateral forces, whose patterns match the shape of potentially excited antisymmetric modes. The amplitude of those forces is derived as a function of the expected amplification of these modes according to the process initially proposed by Price et al. [4]. Two real bridges with different structural configurations are used as a test-bed to demonstrate the effectiveness of the new method. Comparison of the results with those obtained through rigorous response history analysis using partially correlated, spatially variable, spectrum-compatible input motions [5] shows that, the simplified method presented herein provides a reasonably accurate estimation of the SVEGM impact on the response of the bridges examined at a highly reduced computational cost. This is essentially an elastic method that is found to be simple, yet precise enough to consist an attractive alternative for the design and assessment of long and/or important bridge structures in earthquake-prone regions.

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Surface Generation of Asynchronous Seismic Signals for the Seismic Response Analysis of Bridges

Cited by 8 publications

References 31 publications

Seismic Behaviour of Isolated Rc Bridges Subjected to Asynchronous Seismic Input

Seismic Behaviour of Isolated Rc Bridges Subjected to Asynchronous Seismic Input

A method for linear response analysis of long bridges under multi-support seismic excitation

Simplified design of bridges for multiple-support earthquake excitation

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