Seismic reliability of a cable-stayed bridge retrofitted with hysteretic devices

Casciati, Fabio; Cimellaro, Gian Paolo; Domaneschi, Marco

doi:10.1016/j.compstruc.2008.01.012

Cited by 74 publications

(28 citation statements)

References 32 publications

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“…where the union indicates the aggregation of the conditional probabilities for multiple parameters with multiple limit thresholds (Casciati et al, 2008). If the case is reduced to a bi-dimensional one considering, for instance, displacements and accelerations of a structure, the fragility is written in the following form:…”

Section: Comparison Between Spectral Approach and Nonlinear Dynamic Amentioning

confidence: 99%

Spectral and fragility evaluations of retrofitted structures through strength reduction and enhanced damping

Cimellaro

Roh

Stefano

2009

Earthq. Eng. Eng. Vib.

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A retrofi t procedure for existing buildings called the "weakening and damping technique" (WeD) is presented in this paper. Weakening of structures can limit the maximum response accelerations during severe ground motions, but leads to an increase in the displacements or inter-story drifts. Added damping by using viscous dampers, on the other hand, reduces the inter-story drifts and has no signifi cant effect on total accelerations, when structures behave inelastically. The weakening and damping technique addresses the two main causes for both structural and nonstructural damage in structures. The weakening retrofi t is particularly suitable for structures that have overstressed components and weak brittle components. In this paper, the advantages of the WeD are verifi ed by nonlinear dynamic analysis and simplifi ed spectral approach that has been modifi ed to fi t structures with additional damping devices. A hospital structure located in the San Fernando Valley in California is selected as a case study. The results from both analyses show that the retrofi t solution is feasible to reduce both structural acceleration and displacement. A sensitivity analysis is also carried out to evaluate the effectiveness of the retrofi tting method using different combinations of performance thresholds in accelerations and displacements through fragility analysis.

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Section: Comparison Between Spectral Approach and Nonlinear Dynamic Amentioning

confidence: 99%

Spectral and fragility evaluations of retrofitted structures through strength reduction and enhanced damping

Cimellaro

Roh

Stefano

2009

Earthq. Eng. Eng. Vib.

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“…Many numerical methods (i.e., the time domain analysis or frequency domain spectral method) have been proposed to assess both linear and nonlinear seismic responses of cable-stayed bridges under uniform or multisupport ground motions [6][7][8]. Moreover, many works focused on seismic control strategy and fragility analysis for cable-stayed bridges [9][10][11]. With regard to the shake table test of cable-stayed bridges, few studies have proposed to investigate the seismic behavior of cable-stayed bridges.…”

Section: Introductionmentioning

confidence: 99%

“…With regard to the seismic fragility analysis of cable-stayed bridges, a few studies have been proposed recently to assess the seismic vulnerability of cable-stayed bridges. Casciati et al [9] assessed the seismic reliability of a benchmark cable-stayed bridge with passive hysteretic devices using fragility curves. Barnawi and Dyke [10] developed the fragility curves of a benchmark cable-stayed bridge equipped with three response modification systems, namely, active, semiactive, and passive devices.…”

Section: Introductionmentioning

confidence: 99%

Seismic Fragility Assessment of an Isolated Multipylon Cable-Stayed Bridge Using Shaking Table Tests

Pang

2017

Advances in Civil Engineering

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In recent decades, cable-stayed bridges have been widely built around the world due to the appealing aesthetics and efficient and fast mode of construction. Numerous studies have concluded that the cable-stayed bridges are sensitive to earthquakes because they possess low damping characteristics and high flexibility. Moreover, cable-stayed bridges need to warrant operability especially in the moderate-to-severe earthquakes. The provisions implemented in the seismic codes allow obtaining adequate seismic performance for the cable-stayed bridge components; nevertheless, they do not provide definite yet reliable rules to protect the bridge. To date, very few experimental tests have been carried out on the seismic fragility analysis of cable-stayed bridges which is the basis of performance-based analyses. The present paper is aimed at proposing a method to derive the seismic fragility curves of multipylon cable-stayed bridge through shake table tests. Toward this aim, a 1/20 scale three-dimensional model of a 22.5 m cable-stayed bridge in China is constructed and tested dynamically by using the shaking table facility of Tongji University. The cable-stayed bridge contains three pylons and one side pier. The outcomes of the comprehensive shaking table tests carried out on cable-stayed bridge have been utilized to derive fragility curves based on a systemic approach.

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“…The nonlinear seismic response of cable-stayed bridges under both uniform and multi-support excitations has been investigated in some studies, using either the time domain analysis or frequency domain spectral analysis Abdel-Ghaffar, 1990, 1992;Abdel-Ghaffar, 1991;Allam and Datta, 1999]. Recently, many studies have focused on the seismic design and structural passive and semi-active control strategy for cable-stayed bridges [Dyke et al, 2003;Jung et al, 2003;Casciatia et al, 2008;Cámara Casado, 2011;Camara et al, 2013;Barnawi and Dyke, 2014]. It is concluded from these studies that cable-stayed bridges are sensitive to earthquakes because of their high flexibility and low inherent damping [Pacheco et al, 1993;Chang et al, 2004].…”

Section: Introductionmentioning

confidence: 99%

Selection of Optimal Intensity Measures in Seismic Damage Analysis of Cable-Stayed Bridges Subjected to Far-Fault Ground Motions

Zhang

Ding

Pang

2015

J. Earthquake and Tsunami

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The intensity measures of ground motions are closely related to the damage of bridge structures. However, it is difficult for engineers to select these parameters to predict the potential damage of cable-stayed bridges under earthquakes. This paper investigated the correlation between the intensity measures of far-fault ground motions and the damage of cable-stayed bridges. 322 far-fault ground motions were selected, and 26 available intensity measures in the literatures were chosen to carry out comparative analysis on a cable-stayed bridge with a single pylon. The nonlinear finite element model of this bridge was built, considering the stiffness degradation of concrete and low-cycle fatigue effect of steel. It is concluded in this study that velocity spectral intensity (VSI) is the optimal intensity measure for seismic damage analysis of cable-stayed bridges subjected to far-fault ground motions, followed by spectral acceleration at fundamental period and Housner intensity. Five commonly used intensity measures, namely peak ground acceleration (PGA), the ratio of PGA to peak ground velocity (PGA/PGV), specific energy density (SED), predominant period (Tp) and mean period (Tm), demonstrate low correlations with the bridge damage. In particular, there is very weak correlation between the conventionally used PGA and the seismic damage of cable-stayed bridges.

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Seismic reliability of a cable-stayed bridge retrofitted with hysteretic devices

Cited by 74 publications

References 32 publications

Spectral and fragility evaluations of retrofitted structures through strength reduction and enhanced damping

Spectral and fragility evaluations of retrofitted structures through strength reduction and enhanced damping

Seismic Fragility Assessment of an Isolated Multipylon Cable-Stayed Bridge Using Shaking Table Tests

Selection of Optimal Intensity Measures in Seismic Damage Analysis of Cable-Stayed Bridges Subjected to Far-Fault Ground Motions

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