|
|
- 2017
弦支穹顶局部环索断索动力冲击效应试验
|
Abstract:
针对弦支穹顶结构在使用过程中可能遇到的环索断索问题, 对弦支穹顶模型开展了局部环索断索动力冲击效应试验．通过对比环索不同初始预应力和不同索撑节点约束条件下的断索动力冲击效应, 得到了局部环索断索对结构杆件内力和位移的影响及其规律. 试验结果表明：断索点附近的杆件受到断索的影响会发生一定的运动和震荡, 其内力也会发生波动, 且索力越大、节点约束越弱, 波动幅度越大; 当索撑节点处无约束时, 局部断索会引起结构整体的剧烈震动, 且拉索在索撑节点处会发生较大的滑移, 造成整圈环索内力大幅降低, 严重影响结构安全; 对于弦支穹顶结构, 杆件内力的动力放大系数与结构杆件类型、位置、环索初始预应力水平、节点约束等均有关, 需通过试验研究或动力分析等方法来准确获得．
Dynamic impact effect experiment on a suspendome subjected to local hoop cable rupture was conducted considering that hoop cable rupture might happen during the service life. The dynamic impact effects caused by cable rupture under different cable forces and different constraint conditions of cable-strut joints were compared，and thus the influence and rules of the change of member internal force and displacement caused by cable rupture were obtained. Results showed that due to cable rupture，the members located near the rupture spot suffered a certain movement and vibration and the internal force of those members fluctuated after the rupture. The bigger the cable force was，and the weaker the constraint conditions of cable-strut joints were，the more dramatically the internal force fluctuated. With no constraint in cable-strut joints，local rupture would cause intense vibration of the whole structure，and significant cable sliding would occur in cable-strut joints，which would lead to a great decrease of cable force in the whole hoop cable，thus threatening the safety of the structure. For suspendome structures，the dynamic amplification factor of member internal force is related to the type of member，location，initial cable force of hoop cable，constraint condition of cable-strut joints and so on，which needs to be determined by experimental studies or dynamic analyses
| [1] | Yin Zhixiang, Li Jun, Zhao Sida. Antiknock performance of large-span dual-directional beam string structure[J]. <i>Journal of Tianjin University</i>:<i>Science and Technology</i>, 2014, 47(Suppl):64-68(in Chinese). |
| [2] | Mozos C M, Aparicio A C. Parametric study on the dynamic response of cable stayed bridges to the sudden failure of a stay, part Ⅱ:Bending moment acting on the pylons and stress on the stays[J]. <i>Engineering Structures</i>, 2010, 32(10):3301-3312. |
| [3] | collapse with snap-through[J]. <i>International Journal of Non-Linear Mechanics</i>, 2012, 47:751-768. |
| [4] | Zong Zhongling, Guo Zhengxing. Experimental research on mechanical properties and cable broken of levy cable dome[J]. <i>Engineer Mechanics</i>, 2013, 30(1):271-276(in Chinese). |
| [5] | 陈志华. 弦支穹顶结构[M]. 北京:科学出版社, 2010. |
| [6] | Chen Zhihua. <i>Suspendome Structure</i>[M]. Beijing:Science Press, 2010(in Chinese). |
| [7] | 陈志华, 刘红波, 王小盾, 等. 弦支穹顶结构研究综述[J]. 建筑结构学报, 2010, 31(增1):210-215. |
| [8] | Yu Yujie, Chen Zhihua, Wang Xiaoxiang. Refined simplified finite element model of cable and its sensitivity analysis[J]. <i>Journal of Tianjin University</i>:<i>Science and Technology</i>, 2015, 48(Suppl):96-101(in Chinese). |
| [9] | Zhou Yufen, Chen Suren. Time-progressive dynamic assessment of abrupt cable-breakage events on cable-stayed bridges[J]. <i>Journal of Bridge Engineering</i>, 2014, 19(2):159-171. |
| [10] | 宗钟凌, 郭正兴. 葵花型索穹顶结构力学性能及拉索破断试验研究[J]. 工程力学, 2013, 30(1):271-276. |
| [11] | Zhu Mingliang, Dong Shilin, Yuan Xingfei. Failure analysis of a cable dome due to cable slack or rupture [J]. <i>Advances in Structural Engineering</i>, 2013, 16(2):259-271. |
| [12] | Chen Zhihua, Yan Renzhang, Wang Xiaodun, et al. Experimental researches of a suspen-dome structure with rolling cable-strut joints[J]. <i>Advanced Steel Con-struction</i>, 2015, 11(1):15-38. |
| [13] | 陈志华, 王霄翔, 董成林, 等. 一种建筑结构拉索瞬间断开装置:中国, ZL2014104906636[P]. 2016-02-03. |
| [14] | 殷志祥, 李军, 赵思达. 大跨度双向张弦梁结构抗爆性能[J]. 天津大学学报:自然科学与工程技术版, 2014, 47(增):64-68. |
| [15] | 余玉洁, 陈志华, 王霄翔. 拉索半精细化有限元模型及其敏感性分析[J]. 天津大学学报:自然科学与工程技术版, 2015, 48(增):96-101. |
| [16] | Shekastehband B, Abedi K, Dianat N, et al. Experimental and numerical studies on the collapse behavior of tensegrity systems considering cable rupture and strut |
| [17] | Chen Zhihua, Wang Xiaoxiang, Dong Chenglin, et al. A New Kind of Cable Rupture Device for Building Engineering:CN, ZL2014104906636[P]. 2016-02-03(in Chinese). |
| [18] | Chen Zhihua, Liu Hongbo, Wang Xiaodun, et al. Review and forecast of suspendome structures [J]. <i>Journal of Building Structures</i>, 2010, 31(Suppl1):210-215(in Chinese). |
| [19] | Sun Guojun, Longman R W, Betti R, et al. Observer Kalman filter identification of suspen-dome [J]. <i>Mathematical Problems in Engineering</i>, 2017(3):1601534-1-9. |
| [20] | Wolff M, Starossek U. Cable loss and progressive collapse in cable-stayed bridges[J]. <i>Bridge Structures</i>, 2009, 5(1):17-28. |
| [21] | Mozos C M, Aparicio A C. Parametric study on the dynamic response of cable stayed bridges to the sudden failure of a stay, part Ⅰ:Bending moment acting on the deck[J]. <i>Engineering Structures</i>, 2010, 32(10):3288-3300. |
| [22] | 蔡建国, 朱奕锋, 江超, 等. 基于应力比值法的张弦结构动力放大系数研究[J]. 建筑结构学报, 2015, 36(1):116-126. |
| [23] | Cai Jianguo, Zhu Yifeng, Jiang Chao, et al. Research on dynamic magnification factor of string structures based on stress ratio method[J]. <i>Journal of Building Structures</i>, 2015, 36(1):116-126(in Chinese). |
