Overhanging wall cap building structure system for shear wall barrel of high-rise building

The invention discloses an overhanging wall cap building structure system for a shear wall barrel of a high-rise building. The building structure system consists of the shear wall barrel, frame beams, secondary beams, frame columns, outer-circle frame beams, floor slabs and wall caps, wherein the shear wall barrel is positioned at the central position of the high-rise building; the frame columns are positioned on the periphery of the shear wall barrel; the two ends of the frame beams are erected on the frame columns and the shear wall barrel respectively; the secondary beams are erected on the outer-circle frame beams and the shear wall barrel respectively; each wall cap is a closed annular cap edge-shaped structural body which is arranged on the outer wall of the corresponding layer of the shear wall barrel in an enclosing way and outwards and horizontally extends along the radial direction of the shear wall barrel; inner-end reinforcement bars of the wall caps are arranged in the shear wall barrel, and are connected and cast integrally with reinforcement bars of the shear wall barrel; the outer ends of the wall caps are shaped like cantilevers, and are fixedly connected with the corresponding frame beams or the corresponding secondary beams or the corresponding floor slabs. According to the building structure system, under the conditions of large beam span and limited sectional heights, the rigidity and the bearing capacity of the beams can be effectively improved, and the rigidity of a shear wall can be improved.