FINITE ELEMENT DYNAMIC ANALYSIS OF THIN SHELLS SUBJECTED TO ARBITRARY LOADING

A mixture of the compensations of the reduced of Fourier series extension in the third dimensions (semi-analytical procedure) and two-dimensional finite element procedure are adapted to execute dynamic analysis of rotational axisymmetric shells due to random loading types. This procedure is depending for decreases the computer charge and expand the computational competence also time as well as exact results can be obtained. A three-nodded quadratic isoperimetric axisymmetric shell element is selected to mobilize the shell buildings. The computer program called (DAASNL) is established for dynamic and static analysis of arbitrary revolution loaded shells. This program is easy to use with less time for different civil engineering problems with different loading cases. FORTRAN language used for writing this program. Finite element formulation equations of motion are presented and discussed as well as outlined of method solution. The geometry effects, thickness, shallowness, configuration of mesh, boundary conditions and Gaussian integration were presented. Orderly for validate the pertinency for anticipated element depend in the current paper for the dynamic analysis also to explain the improved capability of program in the analysis of axisymmetric bodies under dynamic loading and general static, as well as some cases were presented. The presented cases had been measured in available books and papers so as to comparison of found solution with other analytical solutions for the purpose of verification. Adequate and competent results are found. The study results show that using three node degenerated element conjugate with the semi-analytical standard method is exact dependable also delivers exact solution related to dynamic analysis and astatic even for state of thin shells. For thin shell, an enhancement was appearing in the solution accuracy may accomplished by depending reduced integration method.