Detection of initial strain of main ribs of concrete beam (or slab) by bending moment increment method

In the inspection and identification of engineering structures, it is often necessary to understand force state main ribs components. Based on structural performance test, relationship between bending moment concrete beam (or slab) in elastic phase plastic strain rib analyzed. The initial proposed by increment method. By adding a small amount measuring rib, flexural member estimated better member. During detection process, increase does not adversely affect structure.