61. STRUCTURE TYPES ROOFS SUPPORTED WITH VERTICAL ELEMENTS SUBJECTS OF COMPRESSION: POST AND BEAM STRUCTURES: - LOAD BEARING WALLS - SKELETON FRAME ROOFS SUPPORTED WITH VERTICAL ELEMENTS SUBJECTS OF TENSION: MASTED STRUCTURES - ARCHES, VAULTED HALLS, AND DOMES - PORTAL FRAMES - TRUSSES - SPACE FRAMES - FOLDED ROOFS - SHELLS - MEMBRANES AND TENTS ROOF STRUCTURES