The plane of 1 should be simple, regular and symmetrical, and have sufficient overall torsional stiffness. The plane should be square, rectangle, polygon, circle, ellipse and other regular planes, and the width and depth of the building should be unified.
In the 2-tube-in-tube structure system, when the outer steel frame column adopts H-beam column, the strong axis direction of the column section should be arranged in the plane of the outer tube; The cross section of corner column should be cross, square or round.
3. Steel-concrete composite floor slab should be adopted for steel frame-concrete tube or steel frame-concrete tube structure; Steel (steel pipe) concrete frame-concrete tube floor can be made of steel-concrete composite floor or ordinary reinforced concrete floor.
4. The main beam of the floor slab should not be supported on the coupling beam, otherwise corresponding strengthening measures should be taken.
The floor beam makes the coupling beam twist, and the coupling beam is very sensitive to shear deformation and prone to shear cracks. In the mixed structure, the vertical load borne by the floor beam is usually large. If it is supported on the coupling beam, it will be very unfavorable to the coupling beam and should be avoided as far as possible. If necessary, the connecting beam can be steel reinforced concrete beam or annular floor beam with a width greater than the wall thickness along the periphery of the core tube. The floor beam bearing at one end of the coupling beam should be considered as hinge bearing.
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