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Blast Design - The secret is in assessing the loading correctly and detailing the structural connections properly. I worked on a nuclear bomb shelter many years ago in the Middle East and we used American Military Codes TM....to undertake the design. Also more recently since 9/11 blast loading from terrorist attacks has become norm for important buildings in western countries. The attached two papers will help you - one American, one European. I would look at the European JRC (Joint Research Centre) paper first. With blast each component fixing needs to be checked for the loading. Provided the structural frame is detailed properly with loading sharing redundancies in design and detailing (for accidental damage such as gas explosion where a column may be removed and structure must still stay standing) and with sufficient connections design (steel structures) or reinforcement lap lengths (concrete structures). Also in a wall add a secondary smaller size reinforcement mesh to control concrete cover thickness splintering after a blast. Make sure the façade cladding components are designed for the element loading, especially their connection to the frame. EU_Calcualtions of Blast Loads for structrual buildings.pdf Concrete buildings under blast loading_SU02003FU.pdf

While Calculating vu (Punching Shear Stress) safe also takes into account effect of moments also. Please go through attached file. It explains in detail how Safe calculates punching shear. ftn01-03.pdf