NEHRP Clearinghouse
- Title
- Analytical and Experimental Studies of Suspended Floor Structures with Coulomb Friction Elements.
- File
- PB85168870.pdf
- Author(s)
- Malthan, J. A.; Masri, S. F.; Hata, O. T.
- Source
- National Science Foundation, Washington, DC., November 30, 1984, 188 p.
- Identifying Number(s)
- AA-R-8121-5617
- Abstract
- This report introduces the problem of studying suspended floor structures, especially with regard to the more general mathematical models that may be used to investigate their seismic response when taken as a system of structural elements. Past analytical studies are summarized. Analytical studies were conducted by means of a simplified nonlinear multidegree-of-freedom (MDOF) system consisting of two bodies interconnected by a Coulomb friction element. These studies were aimed at developing guidelines for performing reliable finite-element computer analysis of the transient dynamic response of structures possessing such highly nonlinear characteristics. Experimental studies revealed that the nature of the structural response is heavily dependent on the details of the 'switching' mechanism associated with the change in the direction of the system velocity. Such details involve the duration of the switching process, the deviation of the true friction forces from the simple assumptions used in the conventional Coulomb model, and the presence of slip-stick mechanisms.
- Keywords
- Floors; Earthquake resistant structures; Seismic waves; Mathematical models; Graphs (Charts); Buildings; Earthquake engineering; Suspended structures; Coulomb friction; Structural analysis