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See detailStructural properties of steel-concrete composite joints
Duarte da Costa, Job UL

Doctoral thesis (2018)

The performance of steel and concrete composite frames is influenced by the structural properties of beam-to-column composite joints. The accurate assessment of these properties constitutes therefore an ... [more ▼]

The performance of steel and concrete composite frames is influenced by the structural properties of beam-to-column composite joints. The accurate assessment of these properties constitutes therefore an important element for a realistic representation of the structural behaviour at serviceability and ultimate limit state. However, the structural joint properties are not equally covered by current design standards; analytical guidance is provided to assess the resistance and stiffness of composite joints, whereas for the rotation capacity an experimental proof is required. Due to the additional effort required to determine the rotation capacity, the global plastic analysis finds little application in the design of composite frames, resulting in a lack of efficiency and material optimization in the final design. In the present work, an analytical model to calculate the rotation capacity of composite joints is derived. Based on the knowledge developed in this research, an improvement of the current design rules for the joint stiffness is proposed. This model is based on an experimental test campaign comprising eight full-scale beamto- column joints with composite slim-floor beams. Besides, a finite element model was developed with the software Abaqus, which has been validated by the experimental tests. Numerical simulations were performed to investigate in-depth the conducted experiments and to analyse the behaviour of additional composite joints with different reinforcement properties. This research has resulted in new analytical design rules for the joint stiffness and rotation capacity. The reliability of these new design rules has been demonstrated for different joint typologies using experimental and numerical data. The development of an analytical method for the rotation capacity of composite joints allows composite beams with composite beam-to-column joints to be designed according to the global plastic analysis without need of experimental evidence. Furthermore, the improvement of the current design rules for the stiffness of composite joints induces a more accurate assessment of the action effects at serviceability and ultimate limit state. This thesis provides therefore a complete methodology to design beam-to-column composite joints. [less ▲]

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