(Solved): A A two span continuous concrete girder is subjected to a post-tension force P at both ends. The g ...

A two span continuous concrete girder is subjected to a post-tension force $P$ at both ends. The girder will be post-tensioned prior to the placement of the concrete deck and finishings, which the girder will be supporting. The permanent action is $24\mathrm{kN}/\mathrm{m}$ including the finishing (excluding the selfweight of the concrete girder). The characteristic variable action is $32\mathrm{kN}/\mathrm{m}$ maximum. The girder design will be assuming the following: - Concrete density is $24\mathrm{kN}/{\mathrm{m}}^3$ - Characteristic concrete strength is $50\mathrm{N}/{\mathrm{mm}}^2$ - Design stress limits to Eurocode requirements - SLS load factor for Characteristic Combination $\psi =1.0$ - Prestress loss should be assumed to be $20\%$ For the post-tensioned girder design, you will need to: 1. Determine the bending moment envelope taking into consideration all the load patterns necessary for the two-span girder design, with the given permanent and variable action. 2. For the worst-case moments (both sagging and hogging), determine the minimum section modulus requirement and suggest a suitable section.