多點輸入下大跨空間結(jié)構(gòu)動力穩(wěn)定性分析*
劉志欽1,劉欽2,馬乾瑛3
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劉志欽1,劉欽2,馬乾瑛3(1 河南城建學(xué)院土木與材料工程系, 平頂山 467036;2 河南城建學(xué)院建筑工程管理系, 平頂山 467036; 3 長安大學(xué)土木工程學(xué)院, 西安 710064)[摘要]大跨空間結(jié)構(gòu)屬于缺陷敏感性結(jié)構(gòu)形式,在進行地震動輸入時需要考慮時空相干性對結(jié)構(gòu)動力響應(yīng)的影響。為分析這類結(jié)構(gòu)的動力穩(wěn)定性,將隨機振動方法和時程分析方法結(jié)合,將包含了場地統(tǒng)計規(guī)律的功率譜函數(shù)轉(zhuǎn)化為時程分析方法的荷載輸入,人工合成具有概率意義且考慮空間相干性的地震波,對實際工程中的大跨空間結(jié)構(gòu)進行多點輸入。結(jié)果表明:多點輸入下的地震相干效應(yīng)使結(jié)構(gòu)失穩(wěn)峰值加速度明顯小于一致輸入對應(yīng)的失穩(wěn)峰值,該方法適用于大跨度空間結(jié)構(gòu)的動力穩(wěn)定分析。[關(guān)鍵詞]大跨空間結(jié)構(gòu); 動力穩(wěn)定性; 多點輸入; 相干性中圖分類號:TU3113,TU3933文獻(xiàn)標(biāo)識碼:A文章編號:1002848X(2012)11012305Dynamic stability analysis of large-span spatial structures under multi-support excitationLiu Zhiqin1, Liu Qin2, Ma Qianying3(1 Department of Civil and Material Engineering, Henan University of Urban Construction, Pingdingshan 467036, China; 2 Department of Construction Engineering Management, Henan University of Urban Construction, Pingdingshan 467036, China; 3 School of Civil Engineering, Chang'an University, Xi'an 710064, China)Abstract: Large-span spatial structure belongs to defect sensitivity structural type, and time-space coherence effects on structural dynamic response should be taken into account under seismic inputs. For analyzing the dynamic stability of the structure, random vibration was combined with time history analysis. Power spectrums which include law of site statistic were translated into load input of time history analysis. Seismic wave were synthesized including probability meanings and spatial coherence for large-span spatial structure of practical engineering projects under multi-support excitation. The results show that structural instability peak acceleration under seismic coherence effect of multi-support excitation is obviously smaller than instability peak under uniform excitation. The method can be used in structural dynamic stability analysis.Keywords: large-span spatial structure; dynamic stability; multi-support excitation; coherence*河南省科技攻關(guān)重點項目(112102210361)。作者簡介:劉志欽,博士,副教授,Email: zhiqin0801@126.com。參考文獻(xiàn)[1] 劉文華. 大跨復(fù)雜結(jié)構(gòu)在多點地震動激勵作用下的非線性反應(yīng)分析[D].北京: 北京交通大學(xué),2007.[2] 孫建梅. 多點輸入下大跨空間結(jié)構(gòu)抗震性能和分析方法的研究[D].南京:東南大學(xué),2005.[3] 林家浩,張亞輝. 隨機振動的虛擬激勵法[M]. 北京: 科學(xué)出版社,2004:282.[4] WANG JUNJIE,CHEN HU. A new spatial coherence model and analytical coefficients for multisupport response spectrum combination[J]. Earthquake Engineering and Engineering Vibration,2007,6(3):225235.[5] SU LIANG,DONG SHILIN,KATO SHIRO. Seismic design for steel trussed arch to multisupport excitations[J]. Journal of Constructional Steel Research,2007,63(6):725734.[6] 歐進萍,王光遠(yuǎn). 結(jié)構(gòu)隨機振動[M]. 北京:高等教育出版社,1998:412.[7] 孫建梅,葉繼紅,程文瀼. 考慮空間相干的虛擬激勵法在大跨度空間結(jié)構(gòu)隨機振動分析中的應(yīng)用[J]. 鐵道科學(xué)與工程學(xué)報,2007,4(5):1121.[8] 劉先明,葉繼紅,李愛群. 多點輸入反應(yīng)譜法的理論研究[J]. 土木工程學(xué)報,2005,38(3):1722.[9] 王恒知,石玉成,盧育霞,等. 人工擬合地震動時程參數(shù)對場地反應(yīng)的影響分析[J]. 西北地震學(xué)報,2009,31(2):126130.[10] 張傳成. 大跨空間結(jié)構(gòu)多維多點地震反應(yīng)分析[D]. 北京:北京工業(yè)大學(xué),2008.