Why do buildings need to be reinforced?

In fact, building reinforcement is a very normal thing, because anything used for a long time, there will be damage. In the building reinforcement, you will find the need to reinforce the building are some of the problems, 1: to take the reinforcement of the technical means of transformation can improve the service life of existing buildings. 2: to take the reinforcement of the technical means of transformation can meet the existing building to change the use of the functional safety. 3: to take the reinforcement of the technical means of transformation can ensure the safety of the building surrounding environment.