assembles 31 the requirement for a dynamic analysis often leads to a direct need by the engineer for a sophisticated general purpose computer software system such as gtstrudl gtstrudl permits the engineer to utilize all of the member finite element graphical display and steel design features available in static analysis in conjunction with the dynamic analysis capabilities in those structures subjected to strong wind seismic heavy truck traffic or vibrating machinery loadings using combinations of these features dynamic analysis results may be obtained for a large variety of structures and loading conditions the dynamic analysis of the shock absorbing support system can best be summarized by fig1 first geometry joint coordinates 101 of the system is input into the computer topology member and finite element incidences support boundary conditions member and finite element boundary conditions material properties and member and finite element properties 102 are also needed for the input dynamic information such as structure damping and dynamic loadings time history or spectrum 103 may be collected from the field or from lab experiment if the dynamic loading is from time history it can be converted to spectrum 104 static loads 108 are inputted to perform static analysis 109 the static analysis result 112 can be outputted independently from dynamic output 107.