According to the fatigue type, use safe-life design method to study tower crane's fatigue, and choose nominalstress approach to estimate the life of tower crane.
The test analysis shows that the fitted slope of test data to nominalstress and hot spot stress S-N curves for aluminum 5083 welded joint with longitudinal fillet welded gusset is 5.
Based on the design code of concrete structure (GBJ10-89), the paper gives the nominal tensile stress method of controlling crack width in prestressed concrete structure of punchy bars.