抗震Dynamic Serviceability in Lightweight Engineered TimberFloors.pdfVIP

Dynamic Serviceability in Lightweight Engineered Timber Floors Erik Stefan Bernard1 Abstract: Vibration of lightweight engineered timber floors ETFs is a problem occasionally reported by occupants of dwellings constructed with such floors. Vibration of timber floors has been studied extensively in the past resulting in the development of design criteria to prevent dynamic serviceability problems. Nevertheless, unsatisfactory serviceability continues to be reported. The present experimental investigation has examined several lightweight ETF configurations and found that most satisfy existing design criteria intended to preclude bodily oscillations under foot traffic. However, these same floors failed to display satisfactory performance with respect to vibrational disturbances such as drumminess and shaking. Common variations in design such as changes in fasteners or the inclusion of blocking have little effect on vibrational disturbances. Instead, experimental evidence suggests that minimum levels of structural damping may be required to control such phenomena. DOI: 10.1061/ASCE0733-94452008134:2258 CE Database subject headings: Vibration; Damping; Serviceability; Wood floors; Timber construction. Introduction Review of Literature Excessive vibration in response to foot traffic has been an occa- The causes of unsatisfactory dynamic serviceability in ETF sys- sional problem associated with lightweight engineered timber tems remain unclear. Numerous studies have previously examined floors ETFs. The low mass of these floors relative to the im-