Method for lengthening columns, adding beams, resisting earthquakes and reinforcing for bottom frame structure

Abstract

The invention relates to a method for lengthening columns, adding beams, resisting earthquakes and reinforcing for a bottom frame structure. According to the method, sections of original frame columns are expanded in the bottom frame structure, so that expanded frame columns extend in a uniform section mode to an upper brick-concrete structure till the top of the brick-concrete structure to form a penetrating whole body. Simultaneously, longitudinal beams and transverse beams are added on a bearing wall body of the original brick-concrete structure, added beams are in rigid connection with newly lengthened constructional columns, steel bars are embedded on the original floor and newly added beam portions, newly added beams are effectively connected with the original floor, and one-piece pouring is conducted for newly added longitudinal beams, newly added transverse beams and newly lengthened constructional columns, so that the original floor, newly added beams and newly lengthened columns form an integrated body. By the aid of the method, the load-carrying system of the structure can be changed, the original bottom frame structure system is changed into the frame structure system, the earthquake resistant strength of the structure is improved, and the integrity of the structure is enhanced.

Description

technical field [0001] The invention relates to an anti-seismic strengthening method for long columns and beams of a bottom frame structure, belonging to the technical field of anti-seismic strengthening. Background technique [0002] The bottom frame structure refers to a multi-storey building in which the bottom layer is frame load-bearing and the upper floors are brick wall load-bearing. The bottom frame structure is a mixed load-bearing structure composed of brick houses and frames. Seismic horizontal force is relatively poor. It can be seen from the principles of seismic design that the bottom frame structure is a frame structure at the bottom and a brick-concrete structure at the top, so the whole building does not form a whole. Collapse, facts have proved that the earthquake damage of this kind of structure is relatively serious in previous earthquakes. Due to the large anti-sway stiffness of the upper part of the bottom frame structure, the anti-sway stiffness of t...

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Problems solved by technology

[0006] (3) Intersecting oblique cracks appear at the corners of the outer wall, and in severe cases, the corners collapse

[0008] 3) In most cases, the earthquake damage of the upper floors is relatively light. If the bottom layer is over-strengthened, the weak layer will be transferred to the second floor, causing damage to the upper brick wall

[0009] 4) Since the inner frame structure of the ground floor is characterized by softness and brittleness, large deformation and poor ductility, the damage of the inner frame structure of the ground floor will be more serious than that of the frame structure of the ground floor

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