Nowadays, which type of softwares and codes are using by structural engineer for drawing, analysis and design of structures.?

for structural engineering the best software of analysis is '' autodesk structural analysis robot " .

for codes , you should use the country code or that area code , however structural mechanics are the same its origin from one physics , but using area code mean that you are taking in consideration area settings , geological nature and seismic activity 

For drawing ! of course autodesk Autocad or one of his family ( Civil 3D ... )