Parameter Analysis Of Seismic Spatial Correlation Effects On Single-layer Reticulated Domes

Along with the great development of science and technology, as an important formof spatial structures, single-layer reticulated shells are widely applied in station, airportbuilding, opera house, gallery, which are landmarks of cities or areas and shelters forthe earthquake. Therefore, the requirement for their safety and anti-seismic capacityimporves. The surface movement of an earthquake is a complicated process in time andspaces. considering for wave-passage effect、incoherence effect、site-response effectand attenuation effect, different support of the structure receives the ground motionvarying in frequency and amplitude. Simple support excitation is unreasonable forseismic analysis of long-span structures，relative to multiple support excitations. Theproject of parameter analysis includes7spans,3ratios of rise to span,3levels of roofweight,3seismic inputs,6PGA,13apparent velocity. The time history analysis ofsingle-layer reticulated domes under wave-passage effect, incoherence effect and theircoupling effects is completed40thousand times. The effect discipline and mechanismof spatial correlation are found by large parameter analysis. The thesis consists of thefollowing sections:1.The dissertation expounds the main factors influencing spatial correlation. Theparameters are classified as two sorts, structural parameters and the parameters ofground motion. The parameters and levels are confirmed according to the discipline forchoosing the parameters. A span of90m single-layer reticulated domes under multiplesupport excitations is calculated for the index of spatial correlation, with the ways toevaluate the spatial correlation.2.By changing the parameters, the structural response under wave-passage effectwere derived by records of ground motion in comparison with the structural responseunder simple support excitation. The dissertation obtains the law and the discipline toeffect the structural response under spatial correlation.3. The non-stationary ground motion under wave-passage effect, incoherenceeffect and their coupling effects was simulated based on phase difference spectrum. Byanalysis of structural response under the effect above, conclusion is received byfollowing: the coupling effects of wave-passage effect and incoherence effect can betreated as the addition of single effect. The effect law is different with the proportion ofeach other. And the coupling effects on single-layer reticulated domes are unfavorable.