索穹顶结构局部断索分析
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摘要
索穹顶结构是由索和杆为基本构成单元,通过预应力提供刚度的一类新型索杆空间结构体系。为考察结构中局部索(杆)破坏对整体结构的影响,以某体育馆索穹顶结构方案为背景,采用动力学方法模拟了各类杆件破断后其他杆件内力的变化和结构最终到达的平衡位置。通过观察局部索(杆)破坏是否引起其它索松弛从而造成较大节点变位来判断结构体系是否安全,通过观察局部索(杆)破坏是否引起其它索杆的强度破坏来判断结构是否连续倒塌,同时区分了不同位置杆件的安全等级。该研究对于该类结构的正常使用和维护有一定的借鉴意义。
A cable dome composed of cables and struts is a new type of cable-strut system whose stiffness is provided by prestress.To investigate the structural behavior after one cable (strut) ruptured,dynamic method was adopted to simulate the process of cable rupture.The change of internal forces of other members and the final equilibrium position of the structure after failure of different members was investigated.The safety of the structure was evaluated by observing if the rupture of local cable caused slack of other cables and large displacement.The ability of anti-continuous collapses of the structure was judged by observing whether the rupture of local cable (strut) caused progressive failure of other members.The safety grade of members in different position was also distinguished.This study would benefit the normal service and maintenance of cable domes.
A cable dome composed of cables and struts is a new type of cable-strut system whose stiffness is provided by prestress.To investigate the structural behavior after one cable (strut) ruptured,dynamic method was adopted to simulate the process of cable rupture.The change of internal forces of other members and the final equilibrium position of the structure after failure of different members was investigated.The safety of the structure was evaluated by observing if the rupture of local cable caused slack of other cables and large displacement.The ability of anti-continuous collapses of the structure was judged by observing whether the rupture of local cable (strut) caused progressive failure of other members.The safety grade of members in different position was also distinguished.This study would benefit the normal service and maintenance of cable domes.
引文
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[15]Pellegrino S.Structural Computations with the Singular Value Decomposition of the Equilibrium Matrix[J].International Journal of Solids and Structures.1993,30(21):3025-3035.
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[2]胡晓斌,钱稼茹.结构连续倒塌分析与设计方法总述[J].建筑结构,2006,36,增刊.
[3]金丰年,蒋美蓉,等.美国世贸大厦破坏分析[J].解放军理工大学学报,2004,4(4):63-66.
[4]韦征,叶继红,沈世钊.基于最大熵法的单层球面网壳在地震作用下的破坏模式预测[J].振动与冲击,2008,27(6):64-69.
[5]董贺勋,叶继红.多点输入下大跨空间网格结构的可靠度分析[J].振动与冲击,2006,25(3):131-137.
[6]钱若军,杨联萍.张力结构的分析设计施工.南京:东南大学出版社,2003.
[7]黄呈伟,陶燕.索穹顶结构的动力特性计算分析[J].空间结构,2001,7(2):27-32.
[8]郑君华,袁行飞,董石麟.两种体系索穹顶结构的破坏形式及其受力性能研究.工程力学,2007,24(1):44-51.
[9]张丽梅,陈务军.基于线性调整理论分析Levy型索穹顶体系初始预应力及结构特性.上海交通大学学报,2008,24(6):979-984.
[10]阚远,叶继红.索穹顶结构施工成形及荷载试验研究[J].工程力学,2008,25(8):205-211.
[11]孙旭峰,董石麟,孙宇坤.降阶谱解法在索穹顶结构风振分析中的应用[J].振动与冲击,2008,27(12):13-17.
[12]吴丽丽,王元清,石永久.单层平面索网结构风振响应的几何非线性特性研究[J].振动与冲击,2007,26(4):30-34,50.
[13]梁鹏,徐岳,等.斜拉索分析统一理论及其应用[J].建筑科学与工程学报,2006,23(6):68-75.
[14]傅学怡,吴兵,等.卡塔尔某超高层建筑结构设计[J].深圳大学学报理工版,2007,24(1):1-8.
[15]Pellegrino S.Structural Computations with the Singular Value Decomposition of the Equilibrium Matrix[J].International Journal of Solids and Structures.1993,30(21):3025-3035.
[16]袁行飞,董石麟.索穹顶结构的新形式及其初始预应力确定[J].工程力学,2005,22(2):22-26.
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