THE ESTABLISHMENT OF BOUNDARY INTEGRAL EQUATIONS BY GENERALIZED FUNCTIONS

By the theory of generalized functions this paper introduces a specific generalizedfunction δθβ,by which,togehter with its various derivatives,the boundary integralequations and its arbitrary derivatives of any sufficiently smooth function can beestablished.These equations have no non-integral singlarities.For a problem defined bylinear partial differential operators,the partial differential equations of the problem canalways be converted into boundary integral equations so long as the relevant fundamentalsolutions exist.     

扁壳压曲的蠕变效应

本文讨论了混凝土扁壳压曲的蠕变效应.基于弹性薄壳的非线性理论,发现椭圆抛物面扁壳,其荷载-挠度曲线的上临界荷载将随时间而降低,而下临界荷载则随时间而上升.至于扁壳的局部失稳问题,其临界荷载仅取决于压曲发生瞬间材料的弹性模量.