Reinforcement of existing Truss frame

Reinforcement of existing Truss frame

Dear all,I am doing a project which involves reinforcing existing truss frame.. I have never done this before and personally do not know anyone who has done this. So if anyone having some experience in subject work can guide… refer to any book… preferable Code… Please note that, the already constructed frame is 3 years old and has undergone deformation due to wind load.I don’t know what is the code allowance for such structure? Design Methodology?Methodology to stress relieve the structure?Do we have to tack weld the new structure initially? Proposed methodology and sequence? Any other step/sequence or precaution needed to be taken during execution?