Why does the steel thread have longitudinal ribs?
The main function of the longitudinal ribs is the force to improve the performance of the transverse ribs, the stress of support surface transverse rib in the longitudinal direction, reducing flange stress concentration, so as to improve the mechanical strength of the reinforced rib, deformation of bond between concrete and steel reinforced concrete, the collaborative work and better.
The effect of the longitudinal ribs is indirect, which improves the mechanical properties of the transverse ribs and indirectly enhances the bond with the concrete.
The main function of the longitudinal ribs is the force to improve the performance of the transverse ribs, the stress of support surface transverse rib in the longitudinal direction, reducing flange stress concentration, so as to improve the mechanical strength of the reinforced rib, deformation of bond between concrete and steel reinforced concrete, the collaborative work and better.The effect of the longitudinal ribs is indirect, which improves the mechanical properties of the transverse ribs and indirectly enhances the bond with the concrete.
Thread steel is inaccurate, commonly known as standard "deformed steel bars"". Hot rolled ribbed steel production in China, the surface usually with two longitudinal ribs and transverse ribs along the length direction of the uniform distribution, when the longitudinal section transverse rib crescent, and does not intersect with the longitudinal ribs, called crescent rib reinforced; when the longitudinal section is equal to the height, and with the intersection of longitudinal ribs, said for high ribbed bar. The second and third grade ribbed bars commonly used in engineering usually adopt the crescent rib surface shape.Similar to the screw thread, our country did not produce, it is said that there is such a shape abroad.If it is necessary to say that it is possible to strengthen the tensile and shear strength, because after all, the longitudinal rib expands a little of the cross section of the steel bar. But this is not the purpose of rolling longitudinal rib, the purpose of longitudinal rib is to improve the mechanical performance of the transverse rib.
