Investigation into the damage of a building structure is carried out after a conflagration;the capability of the structures after the fire is inspected.By analyzing the result of inspections

an evaluation is made of the degree of damages of the structure.Corresponding scheme of strengthening the damaged structures are proposed including reinforcing beams and columns with the method of bonding steel and replacing the damaged hollow slab by cast-in-site concrete slabs.After strengthening the structure resumes its complete functions.The experiences gained in this work is of reference value to other similar projects.