engleski

Assessment of an old RC hinged strut frame bridge

In this paper the assessment and repair of a fifty years old reinforced concrete hinged strut frame bridge with spans of 19+4+27+4+19=75 m is presented. The bridge deck is a reinforced concrete voided slab 1.1 m deep and it follows a complex road axis geometry defined with horizontal and vertical curves. It is supported by V-shaped pier bents and concrete hinge bearings at abutments. The bridge was designed according to the 1960’s design codes based on the static analysis performed by the classical elasticity theory and with no seismic actions taken into the account. Due to ageing of structure, increase in traffic loading and changes in requirements of new standards an important issue in developing a proper maintenance strategy is to assess the bridge reliability. Detailed assessment of this bridge and a proposal for counter measures are presented in this paper. The Croatian traffic loading and the fact that according to the current Croatian seismological chart, the peak ground acceleration at the bridge location is 0.3g is taken into account. Employment of external prestressing, fibre reinforced polymers and aseismic devices are contemplated.

traffic load; seismic assessment; strengthening with external cables; seismic restrain at the abutment

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