Other criteria for unsafe building identification

I. Beam specifications

1. Single girder or the central part of a connected girder exhibits transverse cracking, either extending upwards to more than 3/2 of the girder height with the protective layer falling off, accompanied by vertical cracks below.

2. The frame beam shows significant vertical or diagonal cracks at the fixed end, or interlaced cracks appear.

3. Significant diagonal cracks appear at the ends of simply supported beams and continuous beams, and significant vertical or diagonal cracks appear at the roots of the cantilevers.

4. Cracks appear around the edges of the tamping board, or interlaced cracks appear underneath.

5. Significant vertical cracks have appeared under the prefabricated board.

6. Various plate protective layers have fallen off, over half of the main reinforcement is exposed, severe rusting, and cross-sectional reduction

7. Various beams and plates exhibit deflection exceeding 1/150 of their span, and the crack widths in the tension zone are greater than 1mm.

8. Prestressed prefabricated panels exhibit vertical through cracks; or the concrete at the ends is loose, exposing steel bars, with a length exceeding 100% of the main steel bars.

Section 2: Wall Column Specifications

1. Significant interlaced cracks appear in the center of the wall, possibly accompanied by the detachment of the protective layer.

2. Cracks in wall columns or the falling off of protective layers. The primary reinforcement is exposed, or there are significant horizontal cracks, crushing, etc.

3. Columns and wall concrete are crumbling, carbonizing, and bulging; the damaged area exceeds one-third of the total surface area, and the main reinforcement is exposed with severe corrosion and reduced cross-section.

4. Columns and walls exhibit tilting, with the tilt exceeding 1/100 of their height.