Hey fellow engineers, 
i have three questions 
  
1. Acoustic design for a suspended slab according to any standard? 
  
2. Any idea about  unilateral support system for a bridge deck? 
  
3. how to model a CHS space tubular section in SAP 2000 according to BS5400? 
  
Please let me know with whatever informations/knowledge you have. thanks!!! no google materials because i already have ample info from google. i just want to get an insight in respect to experienced engineer. thanks