Started by NathanS, May 13, 2016, 11:04:09 AM
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QuoteSliding snow will reduce the load on the roof of origin, but can impose significant static and dynamic loads on a lower receiving roof. Ansi standards prescribe using the entire snow load from the upper roof to adjust the value of the lower roof and defines no distribution of the load on the lower roof.
Quote from: ChugiakTinkerer on October 19, 2016, 03:23:20 PMHey that's great news! When the numbers are in your favor it's not a boo-boo, it's planning for the unpredictable. When you run those calculations with the 2015 SYP, make sure to use snow loads that are specific to your roof. The ASCE 7-10 applies a standard 0.7 factor to the ground load because roofs don't collect as much snow as the ground. Additionally there is a roof slope factor based on the thermal properties as well as the roof material. The bottom line is your main roof snow load will likely be about 50% of the ground load. This means that a slide-off event that dumps on the shed roof should probably be based on that design load.I'm exploring snow loads because I'm in a 70 psf ground snow load area. I stumbled onto this page that looks like a college engineering class: http://www.civil.utah.edu/~cv5450/roofload/SNOWLOAD.htmIt's a helpful tutorial in navigating the ASCE 7 material. It illustrates unbalanced snow loads well, and there is this gem about secondary roofs:If I had a structure like yours I would calculate the snow loads for each roof based on uniform snow load. I would then calculate the load for the lower roof by adding the weight of all the snow from the main roof that will land on the shed roof. Just the static load, I'm still puzzling out how to do a dynamic load calculation. I'm also grasping the nettle of the different load durations and how to add them together. I know Don_P has explained it but it's taking a while to crack into my thick skull. Finally, I would look at prevailing winter wind direction and make some assumptions about unbalanced snow loading and work up some worst case scenarios.
Quote from: NathanS on October 20, 2016, 05:51:08 PM...Still trying to find some more information on snow impact load.
Quote from: NathanS on November 06, 2016, 07:24:49 PMI'm worried that the stove won't fit in the bucket. I almost almost bought a fork attachment for the loader but was worried about fitment.. I think I will have a lot of use for those forks but it is also hard to spend money on something like that right now.This is our stove - but it will be crated.My neighbor is letting me borrow his flatbed trailer and some dolly type wheels. We were thinking we could have the freight truck lower the stove onto the trailer, and he could probably just use his pallet forks to slide it onto the trailer, or i could winch it. Then drive the trailer to our french door opening, jack the pallet up with my car jack and then push it onto the slab.Open to any ideas.
Quote from: NathanS on November 06, 2016, 08:25:35 PMYou've got me thinking now. Thanks.I do have ratchet straps. Get the bucket up around it as tight as possible, ratchet'er on there and giddyup.One thing I'm worried about is pulling back on the bucket lever and the rear wheels lifting off . That has happened more than once with a full load of stone/and or dirt. I know, put weight on the 3 pt hitch, but I don't want to spend time on that right now while I have a house to weatherproof.