An algorithm for tetrahedron mesh that can approach to the conicoid boundary during the refined process was presented.

Based on the distributed plasticity approach,a new kind of beam element,3-D materially nonlinear beam element with meshed sections,was presented to analyze the materially nonlinear behaviour of frame structures accurately,and a numerical example for the elasto-plastic analysis of a cantilever beam was given to illustrate the accuracy and efficiency of this approach.

Dividing Grid unit is the number of digital urban management information system is an important basis of the preliminary work,and other cities in the success of the pilot,in the western city of Urumqi,and dividing grid unit relevant to the work of meshing the basis of lack of information on line,more work Difficulties.

Study on rationaldeterm ination ofthe grid unit in city and tow n land classification;