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lets try examples on the initial sizing you are asked to propose a suitable section as a pre-stressed concrete beam having the following specifications the beam have a span of 12 meters there is no limits in terms of the overall depth and the maximum width will be 2.4 meter the member is subjected to nudl gk 7.2 kilo newton per meter and qk of 12 kilo newton per meter the concrete at the transfer stage is 26.7 newton per mm square and at the surface stage will be 40 newton per mm square in terms of the losses the alpha is taken as 0.9 while the beta is 0.75 it is given that the beam is a pre-tension beam and it is meant for full processing where tensile limits at the service state will be equals to zero newton per mm square you may pause the video for a while for you to work out the solution as discussed in the previous videos for the initial sizing of the sections it is built on the basis of the four main stress equations which is derived to calculate the stress in the member these