Two-stage damage diagnosis approach for steel frame structures

For the purpose of identifying the damage of steel frame structure,a two-stage damage diagnosis method is presented.At the first stage,the most probable damage area is identified by randomly placing a few sensors.At the second stage,the sensors are placed in probable damage places,and the damage sites and damage extent can be accurately indentified.Using mathematical simulation of a three-layer steel frame structure,the effects of the measurement sites,number of modes,and noise on the precision of identification are assessed.The results demonstrate that even with incomplete measurement information,the two-stage damage diagnosis method can effectively identify the damage sites and extent in the steel frame structure.