EARTHQUAKE RESPONSE REDUCTION OF RETICULAR DOMESBY USING INCLINED BRACING ELEMENTSWITH STABLE STRESS-STRAIN CHARACTERISTICS

摘要

The present paper sought and discussed one of the effective measures to reduce earthquake responses for a singlernlayer lattice dome supported, at its circular periphery, by inclined brace elements of ordinary mild steel. For large,rnhigh or wide spatial structures, the effects due to earthquakes are not negligible, even if metal spatial structuresrnare light weight compared with reinforced concrete spatial structures. Considering the cases that such spatialrnstructures are to be built in high seismic regions, measures to reduce the earthquake responses were studied forrninvestigating the effects of inclined braces installed within supporting walls, and revealed that reticular domes ofrnmedium span around 60 meters are sensitive to earthquake motions, however, the domes themselves can resistrnlarge earthquakes more than 500cm/s2 as a peak acceleration if they are designed to endure vertical static loadsrnlarger than two times their own self weight. And the inclined brace elements are shown more effective inrnreducing the horizontal displacements due to earthquake motions, while the braces within an upright wall arernshown to reduce the vertical displacements in lattice domes because of yielding of braces leading a cut off effectsrndue to braces on earthquake forces.