Wyniki wyszukiwania - BazTech

1

Implementation of GPR and TLS data for the assessment of the bridge slab geometry and reinforcement

Cafiso S., Di Graziano A., Goulias D., Mangiameli M., Mussumeci G.

Archives of Civil Engineering

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2020

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Vol. 66, nr 1

297--308

EN

This paper presents a suggested approach for forensic investigation of bridge decks in which Ground penetrating radar (GPR) consisting of two antennas is used to assess the current conditions. The methodology was tested on a bridge deck in central Sicily. The acquired data were analyzed for identifying the asphalt overlay thickness, concrete cover depth and deck thickness and location of the rebar reinforcement. In the proposed approach for assessing bridge deck conditions the GPR survey was complemented with (i) a site investigation on layer thicknesses for calibration/verification purposes of the GPR response and (ii) a Terrestrial Laser Scanning system (TLS) to verify the bridge design slab curvature. The study shows that this methodology has significant merits on accurately assessing such bridge deck components when bridge design records are non-existing, and by using non-invasive methods such as laser scanning and GPR. The great advantage provided by the TLS technique is the possibility to obtain a 3D output model of the scanned element with the accuracy of the best topographic instruments in order to complement GPR data surveys for bridge inspection.

2

Drgania płyt mostowych pod inercyjnym obciążeniem ruchomym

Litewka P., Sygulski R.

Vibrations in Physical Systems

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2000

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Vol. 19

193--194

3

Static and dynamic analysis of bridge slabs by the finite stript method

Litewka P., Sygulski R.

Archives of Civil Engineering

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1999

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Vol. 45, nr 2

259-273

EN

The paper deals with numerical analysis of the statics and free vibration of bridge slabs by the Finite Strip Method. The multi-span slabs are considered. The intermediate supports are provided in the form of columns. In the numerical analysis the reactions from the column onto the slab are modelled as the equivalent uniformly distributed patch loads. In that way the singularity of the bending moment distribution occuring under the point load can be avoided. The equation of free vibration with the flexibility matrix is adopted. The mass model is the simplest possible with masses concentrated in the nodes of rectangular mesh. The numerical results concern several schemes and prove the efficiency of the method.

PL

Praca dotyczy analizy numerycznej statyki i drgań swobodnych płyt mostowych przy zastosowaniu metody pasm skończonych. Rozważa się płyty wieloprzęsłowe. Podporami pośrednimi są słupy. W analizie numerycznej oddziaływanie słupów na płytę zostało modelowane w postaci obciążenia równomiernie rozłożone na powierzchni prostokątnej. W ten sposób uniknięto osobliwości rozkładu momentów zginających występującej pod obciążeniem skupionym. Przyjęto równanie drgań swobodnych z macierzą podatności oraz najprostszy model z masami skupionymi w węzłach siatki prostokątnej. Wyniki numeryczne dotyczą różnych schematów płyt i wskazują na skuteczność metody.