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Verify collector calculated

hey everybody in this video i'm going to be showing you how to calculate the seismic force on a structures diaphragm this example problem falls under section 3 seismic forces for building structures of the boards test plan so let's get started first off what's a diaphragm what's a cord what's a collector well simply foot simply put a diaphragm is a horizontal element that takes seismic force generated in your structure and transfers that through in-plane shear to your lateral force resisting system whether that be a moment frame or shear walls or brace frames etc uh in this case for this problem we're presented with some diaphragm force we've got a flexible diaphragm that's transferring load to special reinforced concrete shear walls and it's doing so with the help of a couple collectors 60 foot in length on either side that i'm going to go ahead and highlight here okay so a diaphragm it can bend in plane and what that looks like is i'm going to go ahead and just draw an orange here when the load is generated in the diaphragm for a flexible diaphragm it's going to cause it to bend in plane just like so right kind of like a deep beam and what that happens you're going to expect just like a deep beam or just like a beam to have some compression in the top there right and then some tension there in the bottom and so typically you're going to want to be checking that perimeter element or designing a permanent element specifically to take that axial load okay and so this problem is asking us to find what that maximum force is and the force appears in the chord element so just like that top element you have in a truss that's seeing either compression on the top or tension on the bottom of that truss as the truss spans over some length you're going to have a cord element at the top and the bottom of your diaphragm if you will so this problem is asking us to find that maximum chord force along the north south edges so the the top here and the bottom here as i've drawn it out and then also to find the diaphragm shear force right so we're given the force f sub px in the north side direction and it's asking us to find the diaphragm shear force and drawn in red that diaphragm shear force is going to act along the edges here it's going to transfer that load to the lateral force resistance system as we said that is special reinforced concrete shear walls okay all right so we've covered two of the three that i mentioned i mentioned diaphragms chords and collectors okay we covered diaphragms we covered quartz and now we're going to talk about collectors so what is a collector a collector um it's exactly what it sounds like it is right it collects load from the...