大跨度空間結(jié)構(gòu)多維多點(diǎn)非平穩(wěn)隨機(jī)地震反應(yīng)分析.pdf

1、X88302大跨度空間結(jié)構(gòu)多維多點(diǎn)非平穩(wěn)隨機(jī)地震反應(yīng)分析NonStationaryRandomSeismicResponseAnalysisofLong—SpanSpatialStructuresunderMulti—SupportandMulti—DimensionalEarthquakeExcitation【申請(qǐng)碩士學(xué)位】國(guó)家杰出青年科學(xué)基金(50425824)和國(guó)家自然科學(xué)基金(50278064)資助項(xiàng)目學(xué)科專(zhuān)業(yè)：結(jié)構(gòu)工程研究生：

2、林偉指導(dǎo)教師：李忠獻(xiàn)教授、博導(dǎo)丁陽(yáng)教授、博導(dǎo)天律大學(xué)建筑工程學(xué)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