Applying the step by stepapproximation, this paper deduces the theory and formulas of calculating the limit carrying capacity of arch bridge on the condition of four hinged destruction.
以四铰破坏为条件，推导引用逐次逼近法计算拱桥极限承载力的理论方法及计算公式。
2
Then the new step function space is introduced and stability problem for the finite difference scheme is discussed by means of variational approximation method.
然后引入新的步长函数空间，并在这个空间上，采用变分近似法讨论该格式的稳定性问题。
3
By the gaussian approximation and local mode-coupled theory, fused splice loss of step and parabolic index single mode elliptic core fibers have been analyzed, calculated and discussed.