"reinforce barriers" is correct and usable in written English.
You can use it when you are talking about taking measures to make a boundary stronger or more secure. For example, "The government is taking measures to reinforce barriers along the country's border."
There was a reinforced barrier between the passengers and the driver, and a cage in the rear for the gunman.
Public schools do not just reinforce class barriers, they actively create them, and deserve no state encouragement at all.
The Marines were traveling aboard an American Hercules cargo jet full of sandbags needed to reinforce flood barriers.
In some ways, the swift, almost brutal discombobulating experience of flight serves to reinforce perceived barriers and divides, confronting us joltingly and jarringly with our differences.
Emergency services and volunteers in Hungary are racing to build and reinforce flood barriers, with the River Danube threatening to reach record heights.
ROS can directly reinforce passive barriers against pathogens - for example by chemically modifying plant cell walls - but are also important signal molecules mediating gene activation [28], [29].
Given these implications, we might expect strong selection for factors that promote segregation of the two species in order to reinforce species barriers and complete speciation [ 3][ 45].
Expanding drug laws, without specific concessions to scientists, will only reinforce existing barriers to research and prevent potentially life-changing therapies from being realized.
Conversely, strong isolation or strong selection against hybrids can facilitate assortative mating and reinforce reproductive barriers between parental hybridizing species [ 11, 12].
In this case, excess of nonsynonymous to synonymous substitutions could be a sign of diversifying selection acting to reinforce reproductive barriers between strains 1a and 1c.
