Dynamic Test of a Viaduct on the Orastie–Sibiu Highway

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Dynamic testing of bridges has as target to establish their response on pulse forces between the wheels and unevenness of road surface. Generally, during the tests, real time accelerations or deformations are to be measured and which through successive processing methods lead to other data as velocities, displacements, dynamic impact factor, but also the damping ratio. In order to validate the bridge response following testing, the measured data are compared both with allowable limits existing in standards and with the results obtained using analytical or numerical models.

In Romania, the dynamic testing of bridges is recommended by the current standards, only for important bridges, erected in complex or special solutions and also for large span bridges.

The aim of this paper is to outline the results obtained from the on-site measurements during dynamic testing of a viaduct placed on the motorway A1, sector Orăştie-Sibiu. The bridge superstructure is a composite one, continuous girder on 12 spans: 40+10×60+40 m, the substructure consisting in 11 piers with lamellar elevations and variable height in the range 8.50-24m.

In the paper a finite element model is also presented which was used for time-history analyses using an impulse type load. Finally, the results obtained on the site and using the numerical model are compared and discussed.

[1]. STAS 12504-86: “Railway bridges, viaducts and walkways. Testing of superstructures with test actions”, IRS, Bucharest, 1986.

[2]. “Static and dynamic tests at bridges – between 71 +035.82-71 + 715.82 (object 3) and km 73+040.32 - 73+285.32 (object 5), at the Orăștie – Sibiu highway, batch 4“, UTCB Contract no. 205/2013.

[3]. ISO 5348:1998: “Mechanical mounting of accelerometers”, International Organization for Standardization, Geneva, 1998.

[4]. A. K. CHOPRA: “Dynamics of Structures“, third ed., Prentice Hall, New Jersey, 2006

Romanian Journal of Transport Infrastructure

The Journal of Technical University of Civil Engineering Bucharest

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