Abstract
The occurrence of unbalanced moment in edge slab-column connections of flat plate structure cannot be avoided and increase the slab shear stress around the column. This paper investigates the effect of M/V ratio on punching shear strength of edge column-slab connections using finite element analysis. The Concrete Damage Plasticity (CDP) and truss model in Abaqus were used to model the nonlinear behavior of concrete and reinforcement, respectively. Ten values of the M/V ratio were applied to a subassembly edge connection model which was part of a properly design of a 5 story flat plate structure. The shear strength prediction of ACI 318-14 code on the effect of unbalanced moment in edge column-slab connection was also studied. The analysis results show that the effect of unbalanced moment on shear strength is not significant for M/V ratio less than 0.3. However, for M/V ratio greater than 0.3, the shear strength is reduced in an exponential order. The ACI 318-14 code overestimates prediction on connection’s shear strength for the M/V ratio less than 0.3. The code predictions are in a good agreement with the analysis results for the edge connection with the M/V ratio greater than 0.3.
Highlights
The existence of an unbalance moment in slab-column connections of flat plate structures due to span differences, uneven gravity load distribution and lateral loads cannot be avoided especially in edge column-slab connections
The results of FE Analysis for ten variations of M/V ratio are plotted in Fig. 3 in term of shear forces and unbalanced moments
When the unbalance moment was increased to have M/V ratio greater than 0.3m, the shear forces decrease with an increase in M/V ratio
Summary
The existence of an unbalance moment in slab-column connections of flat plate structures due to span differences, uneven gravity load distribution and lateral loads (i.e., wind and earthquake loads) cannot be avoided especially in edge column-slab connections. This moment can affect the punching shear capacity of the connections. The magnitude of unbalanced moment acting on the connections varies according to slab adjacent spans, distribution of dead load, the occupancies activity, and magnitude of lateral forces This condition causes the ratio between unbalance moment and shear force (M/V) changed and affected the punching shear stress at slab critical section. The results of the analysis are compared to the ACI 318-14 code prediction
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