In this Paper,the corner effect of four edge simply supPOrted slabs in use for engineering and its influence on limit load-carrying capacity of slab are analysed.

The study of influence of the crossbeam and corner prop on shear-lag in the thin-wall curve box beams;

The influence of the crossbeam and the corner has been explored in the beeline box beams which have different width-to-span ratio.

The effect of different load cases to the stress of hatch corner;

Assessment of fatigue strength of hatch corners in midship area of an 8 530 TEU container ship;

An automatic FEM mesh refining algorithms for the hatch corner is presented,by which the sparse mesh and refined mesh can transit smoothly with transition element,several kings of filleted corners and holes can be created automatically according to the criterion of CCS,and the specified bar elements can be replaced by shell elements.

Based on mathematical calculations,failure criteria of Lade-Duncan,modified Lade-Duncan and Matsuoka-Nakai could be transformed into J 2 = g(θ σ)? f(I1),and the corresponding ridge function g(θ σ)was derived from these failure criteria.

Based on the ridge function derived from Matsuoka-Nakai,Lade-Duncan and Ottosen strength failure criteria,a modified Ottosen failure criterion is proposed and verified by the true triaxial strength test data of concrete and rock.

From the views of meeting boundary conditions, smooth symmetry and convex of yield strength surface under three-dimensional principal stress space, eight different smooth ridge models which are used ingeotecnnical engineering field are commented in detail, and corresponding advanteges and disadvantages of every smooth ridge model are discussed systematically.

The lightweight aggregate concrete four parameter unified intensity destruction criterion,which considers flow plasticity of LWA under high compressive stress is established by the smooth ridge model of double shears unified.