Performance level | Calculation method and limits |
Limited damage limit condition (LD) | 1) Linear calculation method used; a) Calculated strengths subjected to vertical loads and undamped projected earthquakes not exceeded. b) The sidesway ratio under undamped earthquake loading does not exceed the 0.3% limit. |
Controlled damage limit condition (CD) | 1) Linear calculation method used; a) Calculated strengths subjected to vertical loads and projected earthquakes damped by Ra ≤ 3 not exceeded. b) The sidesway ratio under undamped earthquake loading does not exceed the 0.7% limit. |
2) Nonlinear calculation method used; a) The sidesway ratio does not exceed the 0.7% limit. b) The deformation capacities of the materials not exceeded. | |
Pre-collapse limit condition (PC) | 1) Linear calculation method used; a) Calculated strengths subjected to vertical loads and projected earthquakes damped by Ra ≤ 3 may be exceed to some extent (~1.5 times). b) The sidesway ratio under undamped earthquake loading does not exceed the 1% limit. 2) Nonlinear calculation method used; a) The sidesway ratio does not exceed the 1% limit. b) The deformation capacities of the materials may be exceeded by a limited amount (~1.2 times). |