| | Damage level | Performance level | Damage of structures and components |
| | I | Intact | The main bearing walls are basically intact. The roof or vault is in good condition. Some non-load-bearing components are slightly damaged, such as slight cracks in some doors and windows, sliding tiles on the roof, etc. The structure functions normally and can be used without repair. | | II | Slight damage | The bearing wall has no damage or some slight cracks in some cases. The roof and arch are basically intact. Some non-load-bearing members have slight damage or some obvious damage, such as some non-load-bearing walls have slight cracks, some have obvious cracks, the gable slightly flashes outside, the roof tiles slide, etc. The basic function of the structure is not affected, and it can be used with little or no repair. | | III | Moderate damage | Most of the load-bearing walls have slight cracks, some walls have obvious cracks, some walls have serious cracks, and many cave arches have cracks. There are obvious cracks in some roofs and vaults. Some non-load-bearing components have obvious damage, such as many parts of the wall plastering fall off, some roof tiles fall off, etc. The basic function of the structure is affected to some extent, and it can be used after repair. | | IV | Severe damage | Most of the load-bearing walls have obvious cracks, and some of them have serious damage, such as wall dislocation, breakage, internal or external tilt, or local collapse. Uplift or collapse of roof or vault, local collapse, or the entire structure is obviously inclined. The basic function of the structure is seriously affected, and even part of the function is lost, which is difficult to repair or has no repair value. | | V | Collapse | Most of the walls are seriously broken or collapsed, and the roof or vault is seriously damaged and collapsed. The structure is on the verge of collapse or completely collapsed. The function of the structure no longer exists and there is no possibility of repair. |
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