Abstract
This paper gives a contrastive analysis on high temperature fire resistance performance of organic and inorganic adhesive bar-planting concrete, and researches the influence of different anchorage depth and bar-planting adhesive on mechanical performance of chemical planting bar of concrete with laboratory test method. The research conclusions indicate that component surface shows plenty of water vapor during high temperature heating of organic and inorganic adhesive concretes. During high temperature heating of organic adhesive concrete specimen, concrete shows peeling, steel bar shows slipping failure, and cohesive force reduces obviously; during inorganic adhesive concrete test, deflection of planting bar increases gradually, concrete also shows peeling, while steel bar shows no slipping failure. When the external fire temperature is the same, temperature of steel bar beam is basically the same at different measuring points in the same section, and temperature of different section shall increase gradually along with increment of heating time. Regardless of organic adhesive or inorganic adhesive concrete, the shallower the bar planting is, the earlier the time of showing cracking and slipping failure is, and the weaker the ductility is. Organic adhesive concrete shows greater deformation in high temperature, and specimen shows brittle failure finally after suffering tensile stress and compressive stress repeatedly; strength of inorganic adhesive concrete decreases after suffering high temperature effect, and cohesive action of inorganic adhesive declines, while inorganic adhesive does not lose effect fully. When adopting chemical bar-planting anchorage technology, one shall increase anchorage depth in high temperature environment, to promote safety stock of concrete.
