Abstract
Using circumferential constraint action of steel tube to concrete, steel tube concrete makes concrete be in the condition of three-dimensional pressure, to increase the strength of concrete and enhance the plastic performance. Due to the existence of the concrete could prevent or delay the steel tube from crippling, it makes steel tube material performance can be fulfilled. Steel tube concrete can not only make up two materials their shortcomings, but also give full play to the advantages of both. With high bearing capacity, good plasticity, convenience to construction and good refractory performance, and many other advantages, steel tube concrete make the loss in the fire reduced, and play a certain role in fire prevention and mitigation
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