On the basis of Cangkou Navigational Cable-Stayed Bridge located at Qingdao Bay,a simplified calculation method which is named the equivalent plate thickness method is adopted to analyze the mechanical behavior of anchorage zone under the most unfavorable cable load in general working condition and broken cable condition and under the biggest compression stress in top web of steel box girder.

Non-linear finite element analyses of steel anchor box used in cable-girder anchorage zone,steel anchor box,for Cangkou Navigational Bridge of Qingdao Bay Bridge are carried out by two different methods which are equivalent plate thickness method and non-liner contact element method.

With the concept of equivalent plate thickness, we calculated the periodic electric field in a chain and the periodic charger in the plate surfaces.

In order to determine the optimum thickness of antifreezing layer of highway tunnel in cold region,the thickness was computed by separately using equivalent thickness conversion method,weather analytic method and finite element simulation method.

The fatigue life of different welding shapes between plates of unequal thickness in pressure vessel was investigated from the point of local stress concentration at welding position.

To study the equivalent thickness,and effects of superposition throttle slices to damper characteristics,the bending deformation is analyzed at the throttle mouth radius r_k,and the equivalent thickness formula deduced.

An equivalent thickness conception is proposed to consider the crack closure effects and the three-dimensional stress constraints along the crack front by use of the theory obtained for the straight through thickness crack.

Through finite element analysis on point-supported midhollow glass with various thicknesses,the value of equivalent thickness of mid-hollow glass given in Technical Specification for Point Supported Glass Curtain Wall is revised and corresponding revised coefficient is given.