Ancient architecture is an important historical and cultural heritage in China, and wood structure is the main structural form. Wood beams in the structure will rot, crack and tenon failure during their service, so it is necessary to repair and reinforce them. Many existing reinforcement methods can repair the beam to a certain extent, but have their limitations, and carbon fiber reinfroced polymer(CFRP) strengthening can be widely used in the reinforcement of the wooden beams of the ancient buildings because of their good repair effect and the features that have no influence on their appearance.

As the main force component of timber structure, wood beam is very important to the safety of the whole structure. Because wood is an anisotropic natural material, its shear strength and tensile strength are very low, and the timber beams in the ancient buildings have long longitudinal cracks in the wooden beams because of the long-term effect of load. This paper mainly studies the possible failure forms of wooden beams in ancient buildings, and discusses the strengthening methods of wooden beams.

Main forms of destruction of wood beams

• Decadent destruction

• Cracking and failure

• Tenon breaking

The method of reinforcing wooden beams

The reinforcement principle of wooden beams in ancient buildings

The reinforcement of wooden beams in ancient buildings mainly follows the "original truth, the necessity and the reversibility" of the historic building protection, so as to maintain the original style and features of the ancient architecture to the maximum, and satisfy the repair principle of "repair the old as the old".

Existing repair methods 

• Mending and embedding

• Reinforcement with iron hoop

• Reinforcing steel rod reinforcement

• Clamping and supporting method strengthening

It can be seen from the above review that the repair methods in the existing engineering can not substantially enhance the overall performance of the wood beams, or have durability problems under the long-term environment of the environment, or are only suitable for the good material of the wood itself, or have great influence on the appearance of the components, and all of these methods have shortcomings and limitations.

Modern reinforcement technology----carbon fiber reinfroced polymer(CFRP) composite for strengthening

•  flexible 

•  high strength 

•  high modulus 

•  easy to install

•  long shelf life 

•  light self weight 

•  high toughness 

•  anti high temperature

•  environmental-friendly 

•  for shear strengthening, confinement strengthening, flexural strengthening