Vibration serviceability assessment of GFRP pedestrian bridges

Drygala, Izabela Joanna; Polak, Maria Anna; Dulińska, Joanna

doi:10.1016/j.engstruct.2019.01.072

Cited by 30 publications

(21 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The thickness of a single layer is 0.663 mm, hence the thickness of the entire laminate is 3.978 mm. The density was assumed as 1.71 g/cm 3 . The core is made of a PET foam.…”

Section: Description Of Segmentmentioning

confidence: 99%

“…The core is made of a PET foam. The thickness of the foam is 100 mm, and the density is 100 kg/m 3 Segment has the same cross-section as the target footbridge ( Fig. 2), its total length is reduced to 3 metres, thus theoretical length is 2.5 m. The usable width of segment is 2.59 m and the height of handrails is 1.3 m. The dimensions of cross-section are adopted in accordance with the polish standards.…”

Section: Description Of Segmentmentioning

confidence: 99%

“…1a). The dynamic analysis is crucial for very light footbridges [3]. Their small mass results low natural frequencies that are close to the critical frequencies of dynamic excitations produced by pedestrians.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Dynamic tests of composite footbridge segment – experimental and numerical studies

et al. 2019

View full text Add to dashboard Cite

Experimental dynamic tests and numerical simulations of a 3 meters long segment of a footbridge made of polymer composites are presented in the paper. The span-length is reduced, however dimensions of cross-section are the same as the target footbridge. The segment structure is made of sandwich panels, which consist of fibre reinforced polymer (GFRP) laminates (skins) and a PET foam (core). The first part of the paper contains description and results of experimental dynamic tests, which were subjected to the structure. The excitations during these tests was realised by a group of people standing or jumping on the structure deck. The obtained results allowed to determine natural frequencies as well as damping ratios. Moreover, cyclic loading was applied to the structure deck to check the possibility of delamination or debonding occurrence, as a result of repetitive dynamic excitations. The second part contains validation of numerical model - results of numerical analysis and its comparison with the experimental ones.

show abstract

“…The thickness of a single layer is 0.663 mm, hence the thickness of the entire laminate is 3.978 mm. The density was assumed as 1.71 g/cm 3 . The core is made of a PET foam.…”

Section: Description Of Segmentmentioning

confidence: 99%

Section: Description Of Segmentmentioning

confidence: 99%

See 1 more Smart Citation

Dynamic tests of composite footbridge segment – experimental and numerical studies

et al. 2019

View full text Add to dashboard Cite

show abstract

“…Especially, improvements in the behavior of structures, with regard to their susceptibility to a variety of human-induced dynamic impacts, were examined [1,2]. Other considerations, like aerodynamic behavior, correlation of numerical results with measured dynamic properties, and seismic assessment [3][4][5][6][7] were also investigated. After the earthquake in New Zealand in September 2010, severe damages of footbridges were observed [8].…”

Section: Introductionmentioning

confidence: 99%

Seismic Assessment of Footbridges under Spatial Variation of Earthquake Ground Motion (SVEGM): Experimental Testing and Finite Element Analyses

Drygala

Dulińska

Polak

2020

Sensors

Self Cite

View full text Add to dashboard Cite

In this paper, the seismic assessments of two footbridges, i.e., a single-span steel frame footbridge and a three-span cable-stayed structure, to the spatial variation of earthquake ground motion (SVEGM) are presented. A model of nonuniform kinematic excitation was used for the dynamic analyses of the footbridges. The influence of SVEGM on the dynamic performance of structures was assessed on both experimental and numerical ways. The comprehensive tests were planned and carried out on both structures. The investigation was divided into two parts: in situ experiment and numerical analyses. The first experimental part served for the validation of both the finite element (FE) modal models of structures and the theoretical model of nonuniform excitation as well as the appropriateness of the FE procedures used for dynamic analyses. First, the modal properties were validated. The differences between the numerical and the experimental natural frequencies, obtained using the operational modal analysis, were less than 10%. The comparison of the experimental and numerical mode shapes also proved a good agreement since the modal assurance criterion values were satisfactory for both structures. Secondly, nonuniform kinematic excitation was experimentally imposed using vibroseis tests. The apparent wave velocities, evaluated from the cross-correlation functions of the acceleration-time histories registered at two consecutive structures supports, equaled 203 and 214 m/s for both structures, respectively. Also, the coherence functions proved the similarity of the signals, especially for the frequency range 5 to 15 Hz. Then, artificial kinematic excitation was generated on the basis of the adopted model of nonuniform excitation. The obtained power spectral density functions of acceleration-time histories registered at all supports as well as the cross-spectral density functions between registered and artificial acceleration-time histories confirmed the strong similarity of the measured and artificial signals. Finally, the experimental and numerical assessments of the footbridges performance under the known dynamic excitation generated by the vibroseis were carried out. The FE models and procedures were positively validated by linking full-scale tests and numerical calculations. In the numerical part of the research, seismic analyses of the footbridges were conducted. The dynamic responses of structures to a representative seismic shock were calculated. Both the uniform and nonuniform models of excitation were applied to demonstrate and quantify the influence of SVEGM on the seismic assessment of footbridges. It occurred that SVEGM may generate non-conservative results in comparison with classic uniform seismic excitation. For the stiff steel frame footbridge the maximum dynamic response was obtained for the model of nonuniform excitation with the lowest wave velocity. Especially zones located closely to stiff frame nodes were significantly more disturbed. For the flexible cable-stayed footbridge, in case of nonuniform excitation, the dynamic response was enhanced only at the points located in the extreme spans and in the midspan closely to the pillars.

show abstract

“…In the case of road overpasses, this is particularly important as these are buildings important from the point of view of the functioning of urbanized areas. Road viaducts and footbridges in the aspect of dynamic interactions were the subject of scientific papers [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

The impact of predicted vibrations from mining shocks on the viaduct – case study

Pachla¹

2019

Vib. proced.

View full text Add to dashboard Cite

The paper presents the results of dynamic calculations of a road viaduct subjected to loads resulting from mining shocks. The response spectrum method and the spatial MES model were used for the calculations. The calculations were carried out for predicted accelerations of ground vibrations. The results of calculations may in future be used in the assessment of dynamic resistance of similar structures.

show abstract

Vibration serviceability assessment of GFRP pedestrian bridges

Cited by 30 publications

References 20 publications

Dynamic tests of composite footbridge segment – experimental and numerical studies

Dynamic tests of composite footbridge segment – experimental and numerical studies

Seismic Assessment of Footbridges under Spatial Variation of Earthquake Ground Motion (SVEGM): Experimental Testing and Finite Element Analyses

The impact of predicted vibrations from mining shocks on the viaduct – case study

Contact Info

Product

Resources

About