大跨度混凝土斜拉桥抗爆分析

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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。

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	胡志坚 1
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关键词 ：大跨度混凝土斜拉桥, 爆炸荷载, 局部破坏模式, 约束效应, 加劲肋

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.

Key words： long span concrete cable-stayed bridge blast loads local damage modes confinement effects stiffening ribs

收稿日期: 2015-12-08 出版日期: 2016-11-25

引用本文:

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. JOURNAL OF VIBRATION AND SHOCK, 2016, 35(23): 209-215.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2016/V35/I23/209

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