Menu
Contact Us Search
Organization Title

Degradation of Plywood Roof Diaphragms Under Multiple Earthquake Loading

by J. Bouwkamp, R. Hamburger and J. Gillengerten

Bouwkamp, J., R. Hamburger and J. Gillengerten (1991). Degradation of Plywood Roof Diaphragms Under Multiple Earthquake Loading . SMIP91 Seminar on Seismological and Engineering Implications of Recent Strong-Motion Data, p. 6-1 - 6-10.

Click on the link below for the full text:

PDF (Adobe PDF (SIZE 435 KB)) - Requires Adobe Acrobat Reader or other PDF viewer.


Abstract

This paper summarizes the interim findings of research examining the recorded response of three buildings with concrete walls and plywood roof diaphragms to repeated strong motion events. Observed stiffness characteristics of the diaphragms are compared for each successive event and with that predicted by design formula and available data from static tests. Recorded response of the diaphragms indicates an initial dynamic stiffness substantially in excess of that predicted by static tests and design formulae. Damping for these diaphragms is determined to be low, on the order of 5% or less. Degradation of dynamic stiffness, of highly stressed diaphragms with large aspect ratios is apparent. However, the observed degraded stiffness of these diaphragms is still in excess of that predicted by conventional design formulae. Research was performed under a grant from the California Division of Mines and Geology.