单层网壳结构的动力破坏指数研究
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摘要
为了更加有效地反映单层网壳结构的动力响应特征,建立了一种描述单层网壳结构动力破坏程度的新指标——动力破坏指数,并给出了单层Keiwitt型网壳结构对应不同破坏程度的动力破坏指数分界值.在研究地震作用下单层网壳结构各项耗能的计算方法和变化规律的基础上,结合塑性耗能与最大位移建立了动力破坏指数的表达式,并通过对单层Keiwitt型网壳结构进行大量的参数分析,比较了动力破坏指数同位移、塑性杆件数两个指标的对应关系.结果表明,对于存在局部刚度薄弱的单层网壳结构,动力破坏指数的分析结果更加合理.动力破坏指数是进行单层网壳结构动力响应分析的有效指标.
To describe the dynamical response characters of single layer latticed shell structures more effectively,a new index,i.e.dynamical damage index for describing the dynamical damage extent in the single layer latticed shell structure is set up,and the division index is provided corresponding to different dynamical damage grade.The calculating method and variation law of all kinds of consuming energy under the seismic action in the latticed shell structures are studied.Then the expression of dynamical damage index erected by combining the plastic consuming energy and maximum displacement is presented.Moreover,the comparison among the three index,dynamical damage index,displacement and plastic bar quantity,is completed by large numbers of parameter analysis in the single latticed shell structures.The results show that the dynamical damage index are reasonable to the latticed shell with local weakening stiffness.The dynamical failure index is effective for the quantificational analysis of dynamical failure for single layer latticed shells.
To describe the dynamical response characters of single layer latticed shell structures more effectively,a new index,i.e.dynamical damage index for describing the dynamical damage extent in the single layer latticed shell structure is set up,and the division index is provided corresponding to different dynamical damage grade.The calculating method and variation law of all kinds of consuming energy under the seismic action in the latticed shell structures are studied.Then the expression of dynamical damage index erected by combining the plastic consuming energy and maximum displacement is presented.Moreover,the comparison among the three index,dynamical damage index,displacement and plastic bar quantity,is completed by large numbers of parameter analysis in the single latticed shell structures.The results show that the dynamical damage index are reasonable to the latticed shell with local weakening stiffness.The dynamical failure index is effective for the quantificational analysis of dynamical failure for single layer latticed shells.
引文
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[9]张俊峰,郝际平.基于ANSYS的某拱形刚架极限承载力研究[J].西安建筑科技大学学报:自然科学版,2008,40(2):71-75.ZHANGJun-feng,HAOJi-ping.Research on the ulti mate strength capacity of an arch steel frame using ANSYS[J].J.Xi′an Univ.of Arch.&Tech.(Natural Science Edition),2008,40(1):71-75.
[10]YB9254-95,工业建筑物地震破坏等级划分标准[S].YB9254-95,Division standard grade of earthquake damaged industry buildings[S].
[2]叶继红,沈祖炎.单层网壳结构的动力稳定实验研究[J].空间结构,1997,3(2):34-41.YE Ji-hong,SHEN Zu-yan.Experi mental research on dynamical stability of single layer latticed shell structures[J].space structure,1997,3(2):34-41.
[3]KATO S,SHOUMURA M,MUKAIYAMA M.Study on Dynamic Behavior and Collapse Acceleration of single Layer Reticular Domes Subjected to Horizontal and Vertical Earthquake Motions[J].J.Structural and Construc-tion Engineering,1995,47(7):89-96.
[4]范峰,沈世钊.单层球壳模拟地震振动台试验及结构减震试验研究[J].哈尔滨建筑大学学报,2000,33(3):18-22.FAN Feng,SHENShi-zhao.Study onthe shaking table experi ment and the vibriation reducing experi ment of single layer recticulated shells[J].Journal of HARBIN University of Engineering and architecture,2000,33(3):18-22.
[5]李忠学,沈祖炎,邓长根.杆系钢结构非线性动力稳定性识别与判定准则[J].同济大学学报,2000,28(2):148-151.LI Zhong-xue,SHEN Zu-yan,DENG Chang-gen.Judging criterion on nonlinear dynamical stability for truss struc-tures[J].Journal of Tongji universtiy,2000,28(2):148-151.
[6]杜文风,高博青,董石麟.一种判别杆系结构动力稳定的新方法——应力变化率法[J].浙江大学学报:工学版,2006,40(3):506-510.DU Wen-feng,GAO Bo-qing,DONG Shi-lin.New Judgment Method On Dynamic Instability of Truss Structures:Stress Rate Method[J].Journal of Zhejiang University:Engineer science,2006,40(3):506-510.
[7]PARK YJ,ANG A HS,WEN Y K.Mechanistic seismic damage model for reinforced concrete[J].ASCEJournal of structural engineering,1985,111(4):722-739.
[8]于晓野,范峰,沈世钊.单层球面网壳的抗震性能分析[J].西安建筑科技大学学报:自然科学版,2006,38(4):443-449.YU Xiao-ye,FAN Feng,SHENShi-zhao.Study onthe a seismic performance of single-layer reticulated domes[J].J.Xi′an Univ.of Arch.&Tech.(Natural Science Edition),2006,38(4):443-449.
[9]张俊峰,郝际平.基于ANSYS的某拱形刚架极限承载力研究[J].西安建筑科技大学学报:自然科学版,2008,40(2):71-75.ZHANGJun-feng,HAOJi-ping.Research on the ulti mate strength capacity of an arch steel frame using ANSYS[J].J.Xi′an Univ.of Arch.&Tech.(Natural Science Edition),2008,40(1):71-75.
[10]YB9254-95,工业建筑物地震破坏等级划分标准[S].YB9254-95,Division standard grade of earthquake damaged industry buildings[S].
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