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（1 北京交通大學土建學院 100044；2 哈爾濱工業(yè)大學土木學院 150090）
【提要】 地震內(nèi)力系數(shù)法是一種適用于空間網(wǎng)格結(jié)構(gòu)的簡潔有效的抗震設(shè)計方法，但應(yīng)用于單層網(wǎng)殼結(jié)構(gòu)時需要改進。根據(jù)單層網(wǎng)殼結(jié)構(gòu)的受力特點，考慮彎矩影響，修正了傳統(tǒng)地震內(nèi)力系數(shù)的定義，并選取大量單層柱面網(wǎng)殼算例進行了常遇三維地震作用下的時程分析，觀察其桿件地震內(nèi)力系數(shù)取值隨矢寬比、長寬比、桿件截面等參數(shù)的變化規(guī)律，發(fā)現(xiàn)在文中研究范圍內(nèi)，單層柱面網(wǎng)殼結(jié)構(gòu)地震內(nèi)力系數(shù)取值隨長寬比增大有逐漸增大的趨勢，隨矢寬比的增大有逐漸減小的趨勢。在大量統(tǒng)計分析的基礎(chǔ)上，歸納出可供實際工程設(shè)計參考的
地震內(nèi)力系數(shù)建議取值。
【關(guān)鍵詞】 單層柱面網(wǎng)殼結(jié)構(gòu) 地震內(nèi)力系數(shù) 矢寬比 長寬比 桿件截面
Analysis on Seismic Response of Singlelayer Latticed Cylindrical Shells Due to Multiencountered 3dimension Earthquakes/Xing Jihui1,Qian Hongliang2,Fan Feng2,Shen Shizhao2(1 School of Civil Engineering and Architecture,Beijing Jiaotong Univ.,Beij
ing 100044,China; 2 School of Civil Eng.,Harbin Institute of Technology,Harbin 150090,China)
Abstract:Seismic force coefficient method should be improved when it is used for singlayer space frames. According to the characteristic of singlelayer space frames,the traditional definition of seismic force coefficient employing the effect of bending moment on the stress of members is modified. Large scale timehistory analysis is performed for a lot of singlelayer latticed cylindrical shells due to multiencountered 3dimension earthquakes. The
seismic force coefficients of such structures increase with the increasing of lengthspan ratios and the decreasing of risespan ratios in general in the research range. Based on the analysis result,practical seismic force coefficients for singlelayer latticed cylindrical shells are proposed.
Keywords:singlelayer latticed cylindrical shell; seismic force coefficient; risespan ratio; lengthspan ratio; member size
*國家自然科學基金資助項目(50608002)；北京交通大學“十五”專項科技基金項目(2004SM030)。