Full scale test of a PC bridge to calibrate assessment methods

Abstract

<p>In this paper, experiences on the development of an assessment method for existing bridges are presented. The method is calibrated using the results of full-scale testing to failure of a prestressed bridge in Sweden. To evaluate the key parameters for the structural response, measured by deflections, strains in tendons and stirrups and crack openings, a sensitivity study based on the concept of fractional factorial design is incorporated to the assessment. Results showed that the most significant parameters are related to the tensile properties of the concrete (tensile strength and fracture energy) and the boundary conditions. A finite element (FE) model in which the results of the sensitivity analysis were applied, was able to predict accurately the load-carrying capacity of the bridge and its failure mode. Two additional existing prestressed concrete bridges, that will be used to improve further the method, are also described, and discussed.</p>

Cracking and Fatigue of Heavy Loaded Prestressed Concrete Bridge in Sweden

“…The shear capacity is hard to model correctly with code models, as has been shown in several fullscale tests to failure, see e. g. Bagge et al [6] - [9], Nilimaa et al [10], [11], Bien et al [12], Elfgren et al [13], [14] and Häggström et al [15]. As mentionend, according to the original design there were only very small principle stresses and they could be carried by the concrete.…”