STATIC LOADING TESTS ON IN-PLANE SHEAR BEHAVIOR OF GRID-TYPE SYSTEM CEILINGS AND EVALUATION OF THEIR SEISMIC RESPONSES

Abstract

Grid-type system ceilings are widely used in Japan, but those seismic performances have not been clarified sufficiently yet. In this report, static loading tests are conducted to clarify in-plane shear behaviors and collapse states of system ceilings. Based on the test results, an analytical model with corresponding restoring force characteristics is established. Seismic response analyses under moderate earthquakes show that in-plane deformations are less than about 20% of the one corresponding to maximum bearing capacity in the test. It is noteworthy that brace layout and number of earthquakes can be factors to increase shear deformations.