大跨度混凝土斜拉桥抗爆分析

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振动与冲击 ›› 2016, Vol. 35 ›› Issue (23) : 209-215.

论文

大跨度混凝土斜拉桥抗爆分析

胡志坚 1 ，张一峰 1，刘芳 1

作者信息 +

Blast-Resistance Analysis of Long Span Concrete Cable-Stayed Bridges

HU Zhi-jian 1, ZHANG Yi-feng 1, LIU Fang 1

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文章历史 +

摘要

为了研究大跨度混凝土斜拉桥在爆炸荷载下的动力响应和损伤模式，本文建立全桥实体模型和跨中主梁局部模型，开展了不同炸药条件下的斜拉索应力分析和结构动力响应分析。结果表明：1）斜拉索在爆炸荷载下直接破坏的风险较低，只有偏载作用时近爆点斜拉索有断索风险；2）斜拉桥混凝土主梁的局部破坏模式与爆炸位置和TNT当量均有关系；爆炸位置相同时，随着TNT当量增大，破坏模式由弯曲破坏转变为直剪破坏；3）梁体纵向加劲肋在中小爆炸荷载作用下能有效提高梁体的抗爆能力，其与箱梁顶板形成具有相对强弱刚度的熔断体系，有效限制梁体横向破坏面的扩展，降低破坏程度，甚至可改变梁体的破坏模式；4）箱梁结构破坏时冲击波在箱室内传播存在明显的约束效应并引起更严重破坏。

Abstract

In order to study the dynamic responses and failure modes of long span concrete cable-stayed bridges under blast loads, finite element models for the whole bridge and local segment of midspan of the stiffening girder were established to perform dynamic analysis of cables under different TNT weights and different detonation locations. The results show that stayed cables under blast loading are strong enough to resist breaking except for the case of eccentrical blast loading under which the cables close to the detonation may have high risk of break. Local damage modes for concrete girder may be greatly influenced by TNT equivalent weights and its corresponding location. As TNT equivalent weight increase,the damage mode will change from flexural failure to direct shear failure. The stiffening ribs may improve the blast-resistance for concrete girder under the small and medium-blast loading by enlarging its lateral rigidity and inhibiting the expansion of damage areas. More serious damage occurs in the box girder under the blast loads due to confinement effect on shock wave from inner chamber of the girder after its top slab being penetrated.

导出引用

胡志坚 1,张一峰 1，刘芳 1. 大跨度混凝土斜拉桥抗爆分析[J]. 振动与冲击, 2016, 35(23): 209-215

HU Zhi-jian 1, ZHANG Yi-feng 1, LIU Fang 1. Blast-Resistance Analysis of Long Span Concrete Cable-Stayed Bridges[J]. Journal of Vibration and Shock, 2016, 35(23): 209-215

参考文献

[1] 胡志坚, 胡钊芳. 桥梁结构爆炸荷载特性研究[C].中国土木工程学会桥梁结构分会. 第十九届全国桥梁学术会议论文集. 北京:人民交通出版社, 2010:771-776.
Hu Zhi-jian, Hu Zhao-fang. Study of Blast Loading Characteristics for Bridge Structures[C]. Proceeding of 19th national bridge symposium, Beijing: People’s Communication Press, 2010:771-776. (in Chinese)
[2] 胡志坚, 唐杏红, 方建桥. 近场爆炸时混凝土桥梁压力场与响应分析[J]. 中国公路学报, 2014,29(5):141-147,157.
Hu Zhi-jian, Tang Xing-hong, Fang Jian-qiao. Analysis of pressure field and response for concrete bridges under close blast loading.[J]. China Journal of Highway, 2014, 29(5): 141-147,157. (in Chinese)
[3] 蒋志刚, 王赟, 严波,等. 爆炸荷载作用下悬索桥竖弯响应的数值模拟[J]. 振动与冲击, 2012, 31(2):123-128.
Jiang Zhi-gang,Wang Yun,Yan Bo.Numerical simulation for vertical bending response of a suspension bridge under air explosion loading.[J].Journal of Vibration and Shock,2012, 31(2):123-128.(in Chinese)
[4] 蒋志刚, 朱新明, 严波,等. 钢箱梁爆炸冲击局部破坏的数值模拟[J]. 振动与冲击, 2013, 32(13):159-164.
Jiang Zhi-gang,Zhu Xin-ming,Yan Bo.Numerical simulation for local failure of a steel box girder under blast loading.[J].Journal of Vibration and Shock, 2013, 32(13):159-164.(in Chinese)
[5] Tang EKC, Hao H. Numerical simulation of a cable-stayed bridge response to blast loads, Part I: Model development and response calculations. Engineering Structures, 2010, 32:3180-3192.
[6] Hao H, Tang EKC. Numerical simulation of a cable-stayed bridge response to blast loads, Part II: damage prediction and FRP strengthening. Engineering Structures, 2010, 32:3193-3205.
[7] 邓荣兵, 金先龙, 陈向东, 等. 爆炸冲击波作用下桥梁损伤效应的数值仿真[J]. 上海交通大学学报, 2008,Vol.42,No.11:1927-1934
Deng Rong-bing, Jin Xian-long, Chen Xiang-dong, et al, Numerical Simulation for the Damage Effect of Bridge Subjected to Blast Wave[J]. Journal of Shanghai Jiaotong University, 2008,Vol.42,No.11:1927-1934. (in Chinese)
[8] 张涛, 马如进, 陈艾荣. 爆炸荷载作用下斜拉桥的结构特性[J]. 重庆交通大学学报(自然科学版), 2013,Vol.32,Sup.1:784-787.
Zhang Tao, Ma Ru-jin, Chen Ai-rong. Structural Characteristics of Cable-Stayed Bridge under Blast Loads.Journal of Chongqing Jiaotong University( natural science), 2013,Vol.32,Sup.1:784-787. (in Chinese)
[9] 王新敏. ANSYS工程结构数值分析[M]. 北京:人民交通出版社, 2007.
Wang Xin-min. ANSYS numerical analysis of engineering structures[M]. Beijin: China communication press, 2007.
[10] 李国平. 斜拉索非线性分析的状态修正法[J]. 同济大学学报(自然科学版), 2000, 28:1-4.
LI Guo-ping, State Revision Method in Nonlinear Analysis of Stay Cable[J].Department of Bridge Engineering,Tong ji University, Shanghai, 2000, 28:1-4. (in Chinese)
[11] 陈网桦, 彭金华, 胡毅亭. 爆炸动力学讲义[M]. 南京:南京理工大学, 2005
Chen Wang-hua, Peng Jin-hua, Hu Yi-ting. Explosion dynamics[M]. Nanjing: Nanjing University of Science and Technology, 2005
[12] 周孟波斜拉桥手册[M]. 北京:人民交通出版社, 2004:38
Zhou Meng-bo Cable-stayed Bridge Handbook[M]. Beijin: China communication press, 2004:38
[13] 刘超. 预应力混凝土桥梁爆炸荷载作用效应研究[D]. 武汉理工大学, 2012.
Liu Chao. Study of blast loads action effect for prestressed concrete bridge[D]. Wuhan:Wuhan University of Technology,2012. (in Chinese)
[14] Tu Z, Lu Y. Evaluation of typical concrete material models used in hydrocodes for high dynamic response simulations[J]. International Journal of Impact Engineering, 2009, 36(1):132-146.
[15] Williamson E.B., Bayrak O., Davis C. et al. Performance of Bridge Columns Subjected to Blast Loads. Ⅰ: Experimental Program [J]. Journal of Bridge Engineering, ASCE, 2011, 16(6): 693–702.
[16] AUTODYN Theory Manual, Revision 6.1[M]. Century Dynamics, San Ramon, California,2006.
[17] Analyzing the effects of blast loads on bridges using probability, structural analysis, and performance criteria by Mahoney, Erin Elizabeth, M.S., University of Maryland, College Park, 2007, 139 pages; 14.
[18] 刘鹏, 袁明, 陈克坚,等. 熔断机制在摇摆桥墩连续刚构桥中的应用[J]. 铁道工程学报, 2014, 31:69-73.
LIU Peng, YUAN Ming, CHEN Ke -jian, et al. Application of Fusing Mechanism in the Continuous Rigid Frame Bridge with Rocking Piers[J]. China Railway Eryuan Engineering Group Co.Ltd,Chengdu,Sichuan 610031,China, 2014, 31:69-73. (in Chinese)
[19] Son J, Astaneh-Asl A. Blast Resistance of Steel Orthotropic Bridge Decks[J]. American Society of Civil Engineers, 2014, 17(4):589-598.