1、X88302大跨度空間結構多維多點非平穩(wěn)隨機地震反應分析NonStationaryRandomSeismicResponseAnalysisofLong—SpanSpatialStructuresunderMulti—SupportandMulti—DimensionalEarthquakeExcitation【申請碩士學位】國家杰出青年科學基金(50425824)和國家自然科學基金(50278064)資助項目學科專業(yè)：結構工程研究生：

2、林偉指導教師：李忠獻教授、博導丁陽教授、博導天律大學建筑工程學院二oo五年六月ABSTRACTTheseismicspatialeffectshouldbeconsideredintheseismicresponseanalysisforthelong—spanspatialstructures，becausethesupportnodesmoveununiformlyunderearthquakeexcitationWhilethep

3、resentseismicanalysismethodsinthe“CodeforSeismicDesignofBuildings”(GB500112001)arebasedonthehypothesisofuniformexcitation，SO恤eydonotsuitforlong—spanspatialstructuresSoitisnecessarytostudytheseismicresponsemethodsforlongs

4、panspatialstructuresconsideringseismicspatialeffectinthisthesis，theseismicresponseanalysismethodsforlongspanspatialstructuresundermultisupportandmulti—dimensionalnonstationaryearthquakeexcitationsarestudiedThemainresearc

5、hworkcoversthefollowingaspects：(11Thepseudoexcitationmethodisintroducedtoanalyzetheseismicresponseforlong‘spanspatialstructuresTherandomvibrationapproachforlong—spanspatialstructuresundermultisupportandmulti—dimensionaln

6、onstationaryearthquakeexcitationusingpseudoexcitationisstudied(2)ThesimulationapproachforthestochasticearthquakegroundmotionmodelandparametersandfunctionsofthemodelarestudiedSelfpowerspectrumdensitymutual—powerspectrumde

7、nsityandtimedelayofthemotion，mathematicalmodelofcoherencefimctionbetweentwoexcitations，coherencefunctionbetweenthree—dimensionalearthquakesuitableforthelong—spanspatialstructuresaresummarized(3)Frontmethodisintroducedwhi

8、lecalculatingtherandomresponseoflargeDOFstructuresByusinghismethod，therequirementforthecomputercanbereducedandthecalculatingefficiencycarlbehighlyimproved(4)ComputerprogramfortherandomvibrationanalysishasbeendevelopedAnd

9、randomvibrationanalysisisperformedforTi觚jinOlympicStatusundermultisupportandmultidimensionalnon—stationalearthquakeexcitatioIISComparisonsaremodebetweenmulti—dimensionalandsingle—dimensionalresponse，uniformexcitationandc

10、onsideringtraveling—waveeffectandincoherenceeffects，stationaryresponseandnonstationaryresponseAconclusionisdrawnthattheseismicresponseofthelong—spanspatialstructuresundermultisupportandmultidimensionalnon—stationaryearth