文档介绍：钢筋混凝土预应力
Prestressed reinforced concrete pole when pole bending force, one side of the section compression rod on the o under bending moment reinforced quality than ordinary reinforced concrete pole to light, low cost, less cracking, in order to avoid the bar from corrosion. However, due to the pre stress of concrete and other reasons, it is easy to produce longitudinal cracks. It is easy to break and break under the impact of external forces such as automobiles, which leads to brittle fracture of electric poles.
by comparing the formulas of the bearing capacity of ordinary reinforced concrete and prestressed concrete
It is not difficult for us to make a distinction between the two
Compared with the ordinary, the prestressed pole has the disadvantages of being large and easy to list, because the limit strain of the concrete is low and the stress of the steel bar breaks when it exceeds it.
The prestressed electric pole adopts pre compressive stress in the tension zone, and the pre compressive stress of concrete must be counteracted before compression.
Features: no cracks or delays in the use of loads
reasonable use of high-strength reinforcement and high strength concrete saves material and reduces weight
improve the seismic resistance, thereby enhancing the stiffness and durability of components.
The reinforced concrete poles are divided into ordinary reinforced concre