The calculation of theoretic rebound deflection and test standard of deflection in construction;

Bsaed on the theory of bending bond, the paper discussed the equivalency for σ-π type double bond and bending bond, And the some rules for property of bond were explained satisfactorily.

Classical bending theory of beam and plate can only be fit for thin and long beam and thin due to without considering deformed influence of cross shearing.

On the basis of a single series analytical solution of the bending theory, byintroducing the principle of superposition and by the method of expanding the infinite series into an infinite system of linear equations, an analytical solution or the shallow spherical shell with four edges clamped .