Influence of RC jacketing on the seismic vulnerability of RC bridges

Navarrete, Bertha A. Olmos; Jara, José; Gómez-Soberón,; Díaz, Manuel Jara

doi:10.1016/j.engstruct.2016.05.029

Cited by 15 publications

(5 citation statements)

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“…It is a popular seismic retrofit method that has been actively researched and applied in the past (e.g. [1][2][3]) and attracts also more recent scientific interest, with researchers investigating it experimentally [4][5][6][7][8][9], analytically [10][11][12] or with the use of structural analysis software [10,[13][14][15]. The focus of recent research efforts appears to be on the better modelling of the interface between the existing element and the concrete jacket, the improvement of analytical methods and the use of new materials.…”

Section: Introductionmentioning

confidence: 99%

Optimized seismic retrofit of steel-concrete composite buildings

Papavasileiou

Charmpis

Lagaros

2020

Engineering Structures

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This work is focused on comparatively assessing the cost-effectiveness of three seismic retrofit approaches for non-code-conforming frame buildings with steel-concrete composite columns.The first two of the assessed retrofit approaches aim in indirectly enhancing structural system performance by strengthening individual composite columns using reinforced concrete jackets or concrete-covered steel cages. The third retrofit approach considered aims in upgrading the composite building frame at hand by installing steel bracings at selected bays. A specially developed structural optimization procedure is used to perform an objective comparison of the cost-effectiveness of the three retrofit approaches. The objective of the optimization procedure is to minimize the total retrofit material cost, while constraints are imposed to ensure the satisfaction of design requirements for the retrofitted structure regarding member capacities (according to Eurocodes 3 and 4 for steel beams and composite columns, respectively), structural system performance under horizontal loading (based on interstorey drifts calculated by pushover analyses) and fundamental periods (obtained from eigenvalue analyses). By defining 30 cases of under-designed 2-storey, 4-storey and 6-storey composite buildings (i.e. buildings with steel-concrete composite columns), an extensive numerical investigation involving 120 retrofit optimization runs was conducted. The results obtained provide insight into the relative cost-effectiveness of the three seismic retrofit approaches and reveal certain conditions under which each approach is economically most viable.

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Section: Introductionmentioning

confidence: 99%

Optimized seismic retrofit of steel-concrete composite buildings

Papavasileiou

Charmpis

Lagaros

2020

Engineering Structures

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“…Most of the old bridges constructed before 1990 AD have a longitudinal reinforcement ratio of 0.005 (Navarrete, et al 2016). Hence the model with a longitudinal reinforcement ratio of 0.005 in pier has been used and is denoted with the name "existing" in the analysis.…”

Section: Bridge Descriptionmentioning

confidence: 99%

“…The thickness of steel is the parameter that has been varied. In the FEM model, it is assumed that there is a perfect bond between the original pier and the Steel jacket (Navarrete, et al 2016). The retrofitted cross section consists of two confined cores, longitudinal reinforcement layer and outer steel jacketed layer.…”

Section: Ei = Flexural Stiffnessmentioning

confidence: 99%

“…Among the bridge's structural components, the piers are the most vulnerable elements under the action of seismic loads. To improve the piers bending capacity, different techniques are employed to retrofit the structures, RC jackets, steel jackets, CFRP jackets, external prestressed cables, or even the inclusion of new elements (Navarrete et al 2016).…”

Section: Introductionmentioning

confidence: 99%

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Effect of Steel Jacketing Thickness on Seismic Performance of Bridge

Suwal,

Jamarkattel

2023

SCITECH Nepal

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The bridges of Nepal are getting older and old bridges were designed without considering the seismic forces, hence have low seismic capacity. The capacity of these bridges needs to be enhanced and should perform well during seismic events. The jacketing technique can be used to upgrade the bridge's structural performance. This research paper mostly focuses on the seismic performance enhancement after the application of steel jacketing on the bridge pier. The variable that has been varied is the thickness of the steel jacket. The capacity of a bridge pier is evaluated using displacement-controlled nonlinear static analysis (Pushover). The time history load is applied to the structure to determine the seismic demand of the bridge. The quantification of the enhancement of the bridge structure after the application of Steel Jacketing is evaluated by plotting the fragility curve. The modeling of the bridge is done in CSI Bridge V20.2.0. The different damage state is defined using the strain values obtained from the pushover analysis. For different damage states, the capacity and demand value are used to obtain the probability of exceeding at different PGA levels. The fragility curve is developed using the First Order Second Order Method (FOSM). From the study, it is found, that the vulnerability of the bridge after the use of jacketing for extensive damage state, the probability of failure reduced from 28.22% to 14.24% at 1.0g PGA. Similarly, the vulnerability of the bridge after the use of jacketing for collapse damage state, the probability of failure decreased from 16.93% to 7.22% at 1.0 PGA

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“…To this end, numerous optimization-based design methods for seismic protective devices have been proposed in the last three decades. In general, design methodologies for seismic devices can be classified to be deterministic (Wang, Chung and Liao, 1998;Makris and Zhang, 2004a;Jangid, 2005;Soneji and Jangid, 2007;Ozbulut and Hurlebaus, 2011a) and probabilistic (Karim and Yamazaki, 2007;Agrawal et al, 2012;Siqueira et al, 2014;Olmos Navarrete et al, 2016). The deterministic method simulates the structure's nonlinear time history responses under a handful of ground motions to determine its performance state.…”

Section: ; Aashto 2010)mentioning

confidence: 99%