ملخص
Abstract
In this thesis, the formulation of curved mixed finite strip element for cylindrical shells was developed utilizing the cubic –B3 spline function .Which is referred to in this thesis as a mixed finite strip method.The curved shell element is divided into a number of longitudinal curved strips and each strip element has two nodal line with four knot amended splines in addition to the existing of interference between the first and last ends amended splines in the whole three elementals .At each nodal line and each knot six degree of freedom in the form of three displacement components and three Moments or stress couples .These formulations are applied through selected two types of cylindrical shell roofs , which are circular cylindrical roofs and north light roofs.A software is developed to validate results and it can be used to handle one of boundary condition (simple- simple). The results obtained from the numerical formulation were compared with the analytical solution, where the accuracy and the convergence results were studied for different problems.