3. DESIGN OF THE FRAME WITH NOMINALLY PINNED CONNECTIONS (Variant 1)
4. DESIGN OF THE FRAME WITH SEMI-RIGID AND PARTIAL-STRENGTH CONNECTIONS (Variant2)
5. DESIGN OF THE FRAME WITH SEMI-RIGID AND PARTIAL-STRENGTH CONNECTIONS (Variant3)
6. DESIGN OF THE FRAME WITH RIGID AND FULL-STRENGTH CONNECTIONS (Variant 4)