brief overview of foundation episode 3 tie beam tie column structural frame elements structural frame elements continuous footing footing design concrete volume of footing tie beam concrete footing ties for foundations structural frame elements foundations detallesconstructivos net footing tie beam design details tie beam reinforcement details footing tie beam design details tie beam reinforcement footing tie beam design details tie beam reinforcement tie beams design concrete design tie beam reinforcement tie beam reinforcement details tie beam reinforcement tie beam reinforcement details new beam and concrete footer pads with tie beams details schedule tie beam reinforcement tie beam reinforcement details