prediction of the punching load strength of scs slabs with stud-bolt shear connectors using numerical modeling and gep algorithm

Using bolt shear connectors in steel-concrete-steel (scs) slabs is very important due to producing a complete steel plates connection and adjusting the sandwich thickness desirably. therefore, in the present research, a numerical study is conducted on the flexural behavior of scs sandwich slabs with stud-bolt shear connectors under the effect of the quasi-static concentrated load. for this purpose, first, the experimental specimens extracted from the previously published study were numerically modeled and quasi-statically analyzed using explicit dynamic analysis. then based on the tests, the models were validated. subsequently, the effect of the parameters, including the thickness of steel plates, stud-bolts diameter, the concrete core thickness, center-to-center distance of stud-bolt connectors, and the concrete core strength was evaluated based on the numerical models on the failure modes and the force-displacement curve. finally, using the experimental setup and gene expression programming (gep) algorithm, several numerical models were planned to predict the maximum strength of the slabs and a simple relation was proposed. the maximum strength resulting from the proposed relation and numerical models had an acceptable agreement with an error of 11% based on mean absolute percentage error (mape).