Hoop stress reduction by using reinforced rivets in steel structures

摘要

This paper considers the stress concentration in an infinite plane loaded by a circular inclusion,which is bonded to a reinforced hole.The pulling force of the inclusion is modeled by distributed body force.The infinite plane,the reinforced ring and the circular inclusion can be of different elastic properties.Airy stress function with body force potential was used to solve the problem analytically.Exact solutions were obtained for the stresses in the circular elastic inclusion,the reinforced ring and the elastic plane.Numerical results show that the maximum tensile hoop stress at the hole boundary in the plane can be reduced to becoming negligible if an optimum stiffness ratio between the plane and the rivet is chosen (normally a harder material for the reinforced ring is needed ocmparing to the plane).However,if the reinforced ring is too stiff,tensile hoop stress develops again at a different position.This result provides a new theoretical basis for designing reinforced rivet hole.In addition,a stiffer and thinner reinforced ring always to a smaller tensile hoop stress concentration.