Studi Numerik Random Field - Size Effect dengan Turning Band Method (TBM) terhadap Perilaku Kerusakan Beton Polos dan Beton dengan Tulangan Tunggal (Tension Dominant Behaviour) = Numerical Study of Random Field - Size Effect with The Turning Band Method (TBM) on Damage Behaviour of Plain Concrete and Concrete with Single Reinforcement (Tension Dominant Behaviour)