Method and device for determining thickness of protection layer of light ultra-high performance concrete member

The invention provides a method and device for determining the thickness of a protection layer of a light ultra-high performance concrete member, and the method comprises the steps: determining a critical steel bar corrosion model, and determining the critical steel bar corrosion depth based on the critical steel bar corrosion model; determining the rust expansion cracking life of the first protective layer in a general environment and the rust expansion cracking life of the second protective layer in a chloride environment; determining a first relational expression and a second relational expression between the rust expansion cracking life of the protective layer and the thickness of the protective layer based on the critical steel bar corrosion depth, the rust expansion cracking life of the first protective layer and the rust expansion cracking life of the second protective layer; and the designed service life is obtained, and the first target protective layer thickness of the light ultra-high performance c