![]() ![]() The most common deck footing is basically a big chunk of concrete poured in to a hole in the earth. When a deck is attached to a building, the part of the deck that gets supported by the earth needs to have proper frost footings. Here’s one more photo showing major frost heave at a deck. The deck shown below had severe frost heave in the middle and against the house, and had to be completely torn down and rebuilt because the deck was so severely heaved in the middle. ![]() The right side had obviously heaved several inches. The photo below shows a Maple Grove deck that we recently inspected in the middle of an April snow storm. Without a doubt, some of the worst frost heave I’ve come across has been here in Maple Grove. I once lived in a townhouse in Saint Louis Park with a patio that would heave about 4” during the winter it got so bad that I could barely open my storm door during the winter. Wikipedia has a nice illustration of how this works, shown below. When expansive soils freeze and expand, the earth rises. Today I’ll explain how this works, why it matters, and what steps can be taken to help prevent damage from frost heave when building a deck. A sensitivity study on a recently developed monitoring method is also undertaken.One of the most common problems with decks in Minnesota is frost heave. This paper presents a critical review of existing scour monitoring equipments and methodologies with a particular focus on those using the dynamic response of the structure to indicate the existence and severity of the scour phenomenon affecting the structure. Most monitoring regimes are based on expensive underwater instrumentation that can often be subjected to damage during times of flooding, when scour risk is at its highest. Monitoring scour is of paramount importance to ensure the continued safe operation of the aging bridge asset network. In light of current changes in climate, increasing frequency of flooding, coupled with the increasing magnitude of these flood events, will lead to a higher risk of bridge failure. ![]() Scour is a common soil-structure interaction problem. The high profile failure of the Malahide Viaduct in Dublin, Ireland, which is a part of the EU TEN-T network of critical transport links, was caused by foundation scour. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |