This document describes the simulation framework used in the Snowmass Energy Frontier studies for future Hadron Colliders. An overview of event generation with {sc Madgraph}5 along with parton shower and hadronization with {sc Pythia}6 is followed by a detailed description of pile-up and detector simulation with {sc Delphes}3. Details of event generation are included in a companion paper cited within this paper. The input parametrization is chosen to reflect the best object performance expected from the future ATLAS and CMS experiments; this is referred to as the Combined Snowmass Detector. We perform simulations of $pp$ interactions at center-of-mass energies $sqrt{s}=$ 14, 33, and 100 TeV with 0, 50, and 140 additional $pp$ pile-up interactions. The object performance with multi-TeV $pp$ collisions are studied for the first time using large pile-up interactions.
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