  The results of a search for gluinos in final states with an isolated electron
or muon, multiple jets and large missing transverse momentum using
proton--proton collision data at a centre-of-mass energy of $\sqrt{s}$ = 13 TeV
are presented. The dataset used was recorded in 2015 by the ATLAS experiment at
the Large Hadron Collider and corresponds to an integrated luminosity of 3.2
fb$^{-1}$. Six signal selections are defined that best exploit the signal
characteristics. The data agree with the Standard Model background expectation
in all six signal selections, and the largest deviation is a 2.1 standard
deviation excess. The results are interpreted in a simplified model where
pair-produced gluinos decay via the lightest chargino to the lightest
neutralino. In this model, gluinos are excluded up to masses of approximately
1.6 TeV depending on the mass spectrum of the simplified model, thus surpassing
the limits of previous searches.
