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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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