First , I am Very Happy to Participate in Forum Such As This Forum , I need to Make Engineering Discussion With These Questions   1.       Why We Make Scale Factor Between Static And Dynamic Seismic Analysis ? 2.       After Scale Factor We Design By Load Combinations Included Dynamic Cases Only           Or Static Load Only Or Dynamic And Static ? 3.       What is Diaphragm And What is Importance of Diaphragm In Seismic And Wind? 4.       When We Define Diaphragm? And We Define As Rigid