As we all know, concrete material i

As we all know, concrete material in engineering design performance has good plasticity, modularity, durability and fire resistance, coupled with the good integrity of cast-in-place reinforced concrete structure, a large number of steel-concrete structure is widely used in modern social engineering construction On the contrary, the disadvantages of concrete structure has yet to be improved, to the ultimate tensile strain of concrete and the ultimate compressive strain of the gap is huge, the latter is nearly 20 times of the former, which makes it has a low tensile strength, poor crack resistance were insufficient, secondly because the requirements, such as high strength and high stiffness of concrete structure from major, generally structure gravity load of more than 70% ~ 80% As far as most concrete construction is concerned, the construction period is longer, the template consumption is larger, and the construction is affected by the climate and season, and the new and old concrete is not easy to connect, etc. It is the concrete structure design and construction to be improved, and the focus should be paid attention to avoid accidents in the project