Abstract
With the advances in computational analysis techniques and development of new design methods, new interests have arisen in structural engineering. In the last few years, with the increasing numbers of terrorist attacks, the study of robustness, progressive structural collapse and ultimate resistance of structures has grown exponentially, with various studies being published all over the world. In order to perform this study through computational analysis, it was necessary to develop a calibrated numerical model capable of representing the behaviour of structures in their final stage of resistance. This article presents an evaluation of semi-rigid connections through a numerical model considering the implementation of collapse and damage progression criteria calibrated against experimental tests. Afterwards, a parametric study was developed by varying the bolt diameters and endplate thickness of a flush endplate semi-rigid connection. The main parameters and criteria that rules the simulation of flush end-plate joints subject to damage were assessed, allowing that many different kind of studies with similar components could be performed, such as impact, explosion and column loss analysis. As an outcome, the bending moment-rotation curves of these connections are presented and it is shown that those with a larger bolt diameter were able to produce greater rotation, while an increase in the endplate thickness was able to provide a greater bending moment capacity.
Highlights
Structural connections play a key role in the overall behaviour of steel structures
They are responsible for the load transmission between the elements and are often the limiting factors for the ultimate capacity of steel structures, since they correspond to points where there is high stress concentration
Using the suggested parameters to transform the analysis into a quasi-static analysis, the structure behaved satisfactorily, and the results presented by the standard connection in an explicit analysis with progressive damage implemented coincides with that of the nonlinear static analysis without damage
Summary
Structural connections play a key role in the overall behaviour of steel structures They are responsible for the load transmission between the elements and are often the limiting factors for the ultimate capacity of steel structures, since they correspond to points where there is high stress concentration. The overall behaviour of the connection in relation to the bending moment versus rotation curve is defined by the interaction between each of these components. This method does not consider the ultimate capacity of the materials, considering only that after a resistance limit, the materials begin to deform infinitely without ever failing. These do not present strain hardening and resistance gain, whereby it is necessary to carry out further investigation to have the full connection capacity
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