1. The limit state of filter cloth refers to the critical state in which a structure or component can satisfy a certain functional requirement specified in the design. If the structure or component exceeds the limit state, it will no longer meet the design requirements.
2. The ultimate bearing capacity state is the ultimate state when the structure or member reaches the maximum bearing capacity or reaches the deformation unsuitable for carrying on.
3. The limit state of normal use is the limit state when the structure or component reaches a specified limit value of normal use.