Abstract
This research investigates the effect of unbalanced moment directions on the behaviour of edge column slab connections using a finite element analysis. The analyses were done on subassembly edge column slab connections that were designed according to Indonesian Concrete Standard (SNI 2847:2013). Three unbalanced moment directions were considered namely perpendicular, parallel and inclined 45° to the slab free edge. The concrete damage plasticity (CDP) and truss elements in Abaqus were utilized to model and analyse the behaviour of concrete and reinforcement bars, respectively. The modelling techniques were first validated using an experimental result available in the literature. There are five parameters in the CDP model need to be validated to get convergent results with the experimental data. Using the CDP validated parameters, then seven specimen models were analysed under combined shear force and an unbalanced moment in three directions. The ratio of M/V was kept constant of 0.3. The results show that the punching failure capacity of connections having an unbalanced moment inclined 45° is smaller than that of an unbalanced moment perpendicular to the slab free edge, but higher than that of an unbalanced moment parallel to the slab free edge. The patterns of concrete strain are consistent with the moment directions. All tension rebars passing through column sections yield at the connection failures.
Highlights
Punching shear failures around a column is a complex phenomenon
Deformations of slab in three locations (A, B, and C) identified in Figure 2(a) are plotted against the vertical loads (V) up to connection failure as shown in Figure 3 together with the model’s capacities. It shown that the connection capacity is affected by the unbalanced moment direction
The results of numerical analysis using concrete damage plasticity (CDP) model in Abaqus shows that the punching capacity of the connections decreases from the moment direction of 0o, 45o and 90o to the slab free edge
Summary
Punching shear failures around a column is a complex phenomenon. It becomes more complex when unbalanced moment has to be transferred from the slab to the column that cannot be avoided at edge column slab connections. The unbalanced moment can be due to span discontinuity at the slab free edge, or lateral loads caused by earthquake and wind loads. A good correlation in deformation, capacity and crack pattern were found by [2]
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