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Nonlinear analysis for proposing limit state criteria of reinforced concrete road bridge superstructures

Thi Thuy Van Tran, Bich Quyen Vu Thi

Archives of Civil Engineering

2023

Vol. 69, nr 1

495--512

In the research of long-time operating road bridge superstructures, it should note that when the internal forces in the beam elements reach specific values, the stiffness of the cross-section of these elements should decrease. Besides that, if there are damaged places in the beam-element of the road bridge superstructures, the element could not work normally, and the redistribution of internal forces between elements in the whole system would happen. This phenomenon was not taken into account in the initial design calculation. In practice, it shows that many road bridges are subjected to greater loads than the calculated loads in the design process, but they still normally operate. This article proposes the other limit state criteria in evaluating the load capacity reserve of road-bridge superstructures using nonlinear analysis based on nonlinear deformational models of modern construction codes. The proposed calculation procedure is established to explain the load capacity reserve of long-time operating road bridge superstructures in the case of the lack of experimental evaluation. From the obtained results, the suitable limit state criteria for road bridge superstructures are suggested, and the conclusions about the accuracy of the proposed approach of nonlinear structural analysis are recommended.

Limit Condition for Anisotropic Materials with Asymmetric Elastic Range

Ostrowska-Maciejewska J., Pęcherski R. B., Szeptyński P.

Engineering Transactions

2012

Vol. 60, iss. 2

125-138

In the paper a new proposition of an energy-based hypothesis of material effort is introduced. It is based on the concept of influence functions introduced by Burzyński and on the concept of decomposition of elastic energy density introduced by Rychlewski. A new proposition enables description of a wide class of linearly elastic materials of arbitrary symmetry exhibiting strength differential effect.