Methods of strengthening existing highway bridges

Due to the increase of traffic flow and the increase of load, bridges are suffering from various diseases and need to be reinforced urgently.

Methods of strengthening existing highway bridges.jpg

Due to the increase of traffic flow and the increase of load, bridges are suffering from various diseases and need to be reinforced urgently.

Reinforcement method	Steel plate bonded	CFRP strengthening	In vitro prestressed reinforcement of steel strand	Pre-stressed CFRP laminate
Influence on the original structure	Increasing the original structure weight and size, may damage the original structural steel bar.	Basically, it will not increase the original structure weight and size, and will not damage the original structure.	Increasing the original structure weight and size, may damage the original structural steel bar.	Increasing the original structure weight and size, may damage the original structural steel bar.
Reducing the deformation of the component or closing the crack	The deformation of the original structure can not be reduced and the cracks can not be closed.	The deformation of the original structure can not be reduced and the cracks can not be closed.	It can reduce the deformation of the original structure and seal the cracks	It can reduce the original structural deformation and reduce or seal cracks.
Construction conditions	Mechanical assistance is required and is not suitable for curved corner reinforcement	Construction is convenient	Construction is convenient	Construction is convenient
Construction period	Short	Short	Long	Short
The labor	Many	Less	Many	Less
Construction quality control	It is not easy to find reinforcement defects, and finding problems is not easy to remedy.	It is easy to find reinforcement defects and find problems easy to remedy.	It is easy to find reinforcement defects and find problems easy to remedy.	It is easy to find reinforcement defects and find problems easy to remedy.
Maintenance	Anticorrosion treatment on a regular basis	Periodic inspection	Periodic inspection	Less maintainance