This design is: the structural design drawings of an office building include: general description of structural design, plane positioning layout of dug piles, description of dug piles and detail drawings, detail drawing of dug piles in the annex building, plane positioning drawing of columns, plane positioning drawing of basement columns, reinforcement drawing of basement columns, plane positioning drawing of columns, reinforcement drawing of columns, reinforcement drawing of transverse beams of floor There are 47 drawings in total, including floor slab bottom reinforcement drawing, floor slab support reinforcement drawing, insulation floor slab bottom reinforcement drawing, insulation floor slab support reinforcement drawing, tower floor column plane positioning drawing, tower roof slab reinforcement drawing, tower roof truss structure drawing, and stair structure detail drawing.