The main method of bridge strengthening

Pasting steel plate； FRP composites strengthenig；Enlargement section；Replacement of main beam method； Strengthen the lateral contact of bridge deck；Imposing external prestress method

Girder bridge strengthening -- simply supported beam, slab bridge

Insufficient bending ability, the deflection is too large	The external prestress method was applied; Enlarging the section method; Simple support variable continuous method.
When the increase of the bearing capacity is small	Pasting steel plate FRP composites strengthenig
The disease of individual main girder is serious and other main girder is good	Replacement of main beam method
Lack of transverse connections between beams and slabs	Reinforcing beam Strengthen the lateral contact of bridge deck; Adding lateral prestress
The shear of the oblique section is insufficient	Increase the cross section; Imposing external prestress Pasting steel plate FRP composites strengthenig
Longitudinal cracking along the position of a prestressed steel beam	Closed fracture Durability treatment

Continuum girder bridges, continuous rigid frame bridges

Lack of rigidity of box girder,severe flinch	Imposing external prestress method Change the structure system method
Insufficient shear strength and bearing capacity of box girder	Enlargement section Adding vertical prestress Pasting steel plate FRP composites strengthenig
Lack of bending bearing capacity of box girder	Pasting steel plate FRP composites strengthenig Enlargement section Imposing external prestress method
The partial compression of the tooth plate causes the failure of the tooth plate or the partial cracking of the box girder in anchorage zone.	Enlargement section Pasting steel plate
Crack of bridge leg	Pasting steel plate FRP composites strengthenig Imposing external prestress method
Longitudinal cracks of roof and floor of box girders due to insufficient bearing capacity	Pasting steel plate FRP composites strengthenig Set up cross ribs

Arch bridge strengthening

Masonry arch bridge	Increase the main arch section adjust the dead load on the arch enhance the lateral integrity.
Double curved arch bridge	Increasing cross section or changing section form Sticking steel plate Fiber composite material to enhance transverse integrity.
Truss, rigid frame arch bridge	Enhanced lateral integrity Pasting steel plate FRP composites Imposing external prestress Enlarging member section
Reinforced concrete box (ribs) arch bridge	Enlargement section Adjusting the constant load of the arched building Increase arch rib Enhanced lateral integrity Carbon fiber composite material
Concrete-filled steel tube arch bridge	Enlargement section of concrete filled steel tube FRP composites Replacement of a hanger or a tie Improving the structure of bridge deck system Enhanced lateral integrity

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