Response of the Fatih Sultan Mehmet Suspension Bridge under spatially varying multi-point earthquake excitations

Apaydın, Nurdan Memişoğlu; Baş, Selçuk; Harmandar, Ebru

doi:10.1016/j.soildyn.2016.01.018

Cited by 22 publications

(7 citation statements)

References 25 publications

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“…To study seawater layer effects on the dynamic response of a sea-crossing bridge under tri-directional spatial ground motions, the seismic analysis of a large span cable-stayed bridge was conducted using the generated multi-point artificial waves [26][27][28]. The bridge has five spans; the main span of 436 m, first side spans of 126 m and second side spans of 60 m. The height of left towel of bridge is 167.19 m, its pier has height of 55.73 m; the height of right towel is 172.69 m, its pier has height of 61.23 m. A 3D finite element model of the cable-stayed bridge was developed using ANSYS software, as shown in Fig.…”

Section: Finite Element Modelingmentioning

confidence: 99%

The effect of seawater layer on cable-stayed bridge under tri-direction spatial varying ground motions

Shi¹,

Pan²,

Fan³

2018

J. vibroeng.

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Abstract. In recently years, many sea-crossing bridges were built in some countries. For the complexity of seafloor condition and the stochastic characteristics of earthquakes, it is necessary to research the seismic responses of these sea-crossing bridges located on seawater layer and irregular bottom conditions. In this paper, a theory of the spatial varying ground motions was derived considering the wave propagation in soil and water. The effects of sea water layer, wave passage, coherence, local site and soil saturation on the seismic responses of a cable-stayed bridge were researched. The transfer function was used to calculate the local site effect and soil saturation effect. The seawater layer effect was studied via a simple medal from Crouse and Quilter. Multi-support and tri-direction excitations were utilized with large mass method. The seismic responses of a long span cable-stay bridge in the site conditions with and without seawater were compared. The results present that the seawater layer affects the earthquake response of bridge greatly, and the soil types have different effects on the different component of bridge. The research will help reasonably evaluate the security of sea-crossing bridge under earthquake excitation.

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Section: Finite Element Modelingmentioning

confidence: 99%

The effect of seawater layer on cable-stayed bridge under tri-direction spatial varying ground motions

Shi¹,

Pan²,

Fan³

2018

J. vibroeng.

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“…In the previous studies, the obtained frequencies from full‐scale dynamic and ambient vibration tests on the bridge were within the expected values and could be used for validation of a numerical model of the bridge. Considering spatially varying multi‐point earthquake excitations, Apaydin et al 11 first conducted a detailed numerical investigation on the Fatih Sultan Mehmet Bridge. They revealed that the results under multi‐point earthquake motions obtained were relatively higher when compared with those from uniform ground motion and that the displacement response of the towers and deck under non‐uniform earthquake motion differed from that of uniform motion.…”

Section: Introductionmentioning

confidence: 99%

Hanger replacement influence on seismic response of suspension bridges: Implementation to the Bosphorus Bridge subjected to multi‐support excitation

Baş

Dong

Apaydın³

et al. 2020

Earthq Engng Struct Dyn

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The effects of hanger replacement from inclined to vertical configuration on seismic response of long-span suspension bridges are investigated considering multi-support earthquake excitation. The Bosphorus Bridge is investigated due to its recent comprehensive rehabilitation, mainly involving hanger replacement. The finite-fault stochastic simulation method (FINSIM) is utilized for multi-point earthquake time-history generation. The developed finite element (FE) model both for the inclined and vertical hanger arrangement are verified through the structural health monitoring (SHM) data. Based on the comparative analysis, the tension force of vertical hangers is found to be lower than that of inclined hangers, whereas the tension force of the main and back-stay cables remains the same. The compressive axial force of the deck decreases relatively in the case of the vertical hanger arrangement, whereas the crosssectional forces at the tower base section increase. The approach viaducts are not affected by the vertical hanger arrangement. According to the demand/capacity ratios for damage estimation under the max. earthquake (2475 years return period), structural damage on the tower base section may be expected for both hanger arrangements, while these sections perform well under design scenario earthquake. The expansion joint of the bridge with inclined hangers is also estimated to be damaged; however, this displacement is lower in the case of the vertical hanger arrangement due to the viscous dampers. The findings also reveal that a change in hanger form of a suspension bridge can necessitate other structural retrofit, such as using viscous dampers to limit longitudinal displacements of the deck and retrofitting the bridge towers.

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“…Due to the diversification of structural forms, the seismic responses of multipoint excitation are also different. Scholars at home and abroad focused on some large-span structures represented by some bridges [3][4][5][6] and then paid attention to some unique structures, such as arch trusses [7], arch dams [8], string support shell [9], cable dome [10,11], long tunnel [12], and multitower and conjoined structure [13,14].…”

Section: Introductionmentioning

confidence: 99%

Seismic Response and Vibration Reduction Analysis of Suspended Structure under Wave Passage Excitation

Cai

et al. 2020

Advances in Civil Engineering

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In order to study the influence of traveling wave effect on the seismic response and damping effect of suspended structure, a series of shaking table tests of the 1 : 20 suspended structure have been carried out to compare and analyze the dynamic responses of suspended structures under two points and a consistent input. The vibration damping effect and vibration reduction law of suspended structure are discussed at different apparent wave velocity and in the different connection. The research shows that the damping suspended structure has a good damping effect, and the amplitude reduction of the top displacement peak response is up to 15%, which corresponds to smaller apparent velocities. Moreover, the upper bound of the maximum acceleration response at the structures’ top under nonuniform input motions equals that of the uniform motion. However, there is a hysteresis in the acceleration response under wave travelling excitations, and the smaller the apparent wave velocity, the more obvious the hysteresis.

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Response of the Fatih Sultan Mehmet Suspension Bridge under spatially varying multi-point earthquake excitations

Cited by 22 publications

References 25 publications

The effect of seawater layer on cable-stayed bridge under tri-direction spatial varying ground motions

The effect of seawater layer on cable-stayed bridge under tri-direction spatial varying ground motions

Hanger replacement influence on seismic response of suspension bridges: Implementation to the Bosphorus Bridge subjected to multi‐support excitation

Seismic Response and Vibration Reduction Analysis of Suspended Structure under Wave Passage Excitation

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