Inverse dynamics method in properties estimation of residual stiffness of multi-story buildings

Abstract

The present paper considers methods and algorithms for determining the values of horizontal stiffness of multi-story buildings based on experimental laser measurements of their natural vibrations. The developments findings are used in determining the residual stiffness of various structures in a certain operation period, subjected to intensive dynamic loading. No need for a close inspection of buildings associated with the inevitable dismantling of enclosures and emptying of the buildings is considered as an advantage of such methods for determining the stiffness parameters of buildings. Direct method for determining the horizontal stiffness of buildings by means of specified displacements and corresponding forces in their elements implies fixing of tension elements in specified nodes – mass centers of structures. However, in some cases, they fail to be implemented. The suggested approach demonstrates its potential in the inspection of a large residential area consistent of buildings under different operating conditions, thus requiring the development of an action plan to ensure the functionality of the structures. In addition, the paper demonstrates that using the dynamic low-size models in the estimation of stiffness parameters implies determining the principles of forming the types of such models.