For truss structures with breathing cracks,a high-precision local damage identification method was pro-posed.The finite element simulation of cracked members was carried out,and the reduction of tensile stiffness of damaged truss members was taken as the damage factor.The internal force of damaged members was replaced by unknown load.The bilinear dynamic equilibrium equation of breathing cracks was established.The integral equation load identification method was used to identify the internal force of the damaged member,so as to calculate the damage factor of the mem-ber.The results show that the damage identification effect under different excitation is good,and the identification accura-cy under harmonic load is the highest.When trigonometric function or exponential function is selected as virtual displace-ment function,the recognition accuracy of the algorithm is the best.
damage identificationtruss structurebilinear respiratory fissurevirtual work principle
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