Analysis of Stability Bearing Capacity of Framework with Cuplok Brackets Under the Condition of Ground Frost Heave

As a temporary steel structure in construction, the importance of treatment for the foundation of framework is often neglected in engineering. Due to many factors such as the decrease of temperature and the high moisture content of soil, the foundation of framework is prone to heave which seriously endangers the construction safety of supporting frame. In order to study the actual mechanical properties of framework with cuplok brackets on the heave foundation, the relations between the height of framework and the allowable heave displacement was analyzed based on the theory of multi-segment continuous compression bars, and the model of framework with cuplok brackets was established with ABAQUS. The results showed that the stability bearing capacity of the framework decreased up to 57.92% after the foundation was heaved, which was the instability failure of a single rod; when failure occurred, the stability bearing capacity of the framework was less related to the number of heave members than to the stiffness of the heave members; the allowable heave displacement was the smallest under the condition of heave of upright rods at foundation corner while the allowable heave displacement was the maximum under the condition of heave of upright rods at the middle of foundation; the allowable heave displacement of the uprighty rods increased with the height of the framework.