Abstract
The evaluation of the load-carrying capacity of a structure is an important aspect of the structural design. In particular, large seismic events can significantly compromise the performances of structures, or parts of them, due to the formation and accumulation of plastic deformation. In the present paper, we analyse the seismic performance of a thin steel bridge column by means of an unconventional elastoplastic and damage model. The idea is to evaluate the horizontal load-carrying capacity of the pier for different seismic events, analysing the conditions that can compromise the stability of the structure.
Highlights
The evaluation of the capacity of the structure to undergo seismic events, without compromising the stability, is a crucial point for the design
According to the standard design, the seismic performance in large earthquakes is often evaluated with the maximum loading wave that can hit the structure
The criteria can provide, in first approximation, a valid tool to judge the seismic performance of steel bridge columns under unidirectional seismic loading
Summary
The evaluation of the capacity of the structure to undergo seismic events, without compromising the stability, is a crucial point for the design. One complication in the definition of the load is due to the fact that seismic excitations are quite complex Their intensity and direction are quite random and it is difficult to define a standard loading wave. The authors published a work [3] reproducing the same experimental results carried out by Nishikawa and extending the investigations on nonproportional cyclic loading along two horizontal directions. According to the standard design, the seismic performance in large earthquakes is often evaluated with the maximum loading wave that can hit the structure. The application of a series of cyclic loadings, with a smaller amplitude than the one prescribed for the design of the structures, can jeopardize the stability, due to the plastic strain and damage accumulation
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