ESTIMATED MASS AND STIFFNESS MATRICES OF SMEAR BUILDING FROM MODAL TEST DATA

A method that estimates mass and stiffness matrices of shear building from modal test data is presented in this paper. The method depends on only measurable points that are less in number than the total structu ral degrees of freedom, and on the first two orders of structural mode measured. So it is applicable to most of the general test. Based on t his method modal data of unmeasurable points are estimated, then globa l mass and stiffness matrices of structure are obtained by using the f irst two orders of modal data. Taking advantage of iteration the optim um global mass and stiffness matrices are gained. Finally, an example is studied in this paper. Its result shows that this method is reliabl e. (C) 1998 John Wiley & Sons, Ltd.