There are several types of structural elements and systems used in buildings. Structural elements include columns, beams, walls, arches, vaults, and domes which carry and transmit structural loads. Common structural systems include wall-bearing, trabeated, arcuated, and framed systems. Wall-bearing construction uses masonry walls to support beams and floors, while trabeated and arcuated systems employ arches, lintels, and post-and-lintel construction. Framed systems like timber, steel, and concrete framing provide rigid structures using interconnecting load-bearing members.