__________ is used for tying the steel coloumns to concrete foundation.

ANS:C - Anchor bolts

Anchor bolts are used for tying the steel columns to concrete foundation. Anchor bolts are typically embedded into the concrete foundation during its pouring process. Once the concrete has set, the exposed end of the anchor bolt protrudes from the concrete surface. Steel columns are then positioned over the anchor bolts, and nuts and washers are tightened onto the exposed ends of the bolts to secure the columns firmly to the foundation. This anchoring method provides stability and structural support, ensuring that the columns remain securely attached to the foundation even under load or external forces.