Active strengthening method of multi-span ordinary reinforced concrete beam bridge

The invention discloses an active strengthening method of a multi-span ordinary reinforced concrete beam bridge, wherein a steel arch sheet is added under the multi-span ordinary reinforced concrete beam to be strengthened, a steel support column is arranged between the steel arch sheet and the ordinary concrete beam, and steel tie rods are arranged between the arch feet on both sides of the steelarch sheet. A method for increase arch sheet. A rigid restrained bracing system is formed between the reinforced arch and the original reinforced concrete beam, and a rigid restrained bracing systemis formed between the reinforced arch and the original reinforced concrete beam. The internal force of the beam is reduce, the bearing capacity of the bridge can be greatly improved, the overall rigidity of the bridge to be strengthened can be increased, the crack width of the beam body can be effectively contracted, the durability of the bridge can be improved, and the steel tie rods arranged atthe steel arch legs are fav