大跨混凝土斜拉桥施工过程中结构的断索动力响应

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振动与冲击 ›› 2021, Vol. 40 ›› Issue (5) : 237-246.

论文

张羽 1，方志 1,2，卢江波 3，向宇 4，龙海滨 3

作者信息 +

Broken cable-induced dynamic response of long-span concrete cable stayed bridge during construction

ZHANG Yu1, FANG Zhi1,2, LU Jiangbo3, XIANG Yu4, LONG Haibin3

Author information +

文章历史 +

摘要

为研究大跨混凝土斜拉桥施工过程中结构的断索动力响应，以湖南赤石特大桥火灾后九根拉索断裂的事故为背景，采用有限元软件建立了赤石特大桥的非线性动力实体有限元分析模型，通过对比灾后检测得到的索力、主梁和索塔位移及裂缝开展情况与有限元模型中相应的计算结果，证明了模型的有效性。基于已验证的有限元模型，对斜拉桥结构在多根拉索断裂过程中的动力响应进行了分析。结果表明：（1）拉索静态断裂只会对断索区域附近的截面内力和索力造成影响，而拉索骤断引起的冲击作用则会导致全桥结构都产生较大内力变化；（2）单侧索面部分拉索断裂导致主梁顶板及腹板受到扭矩和双向弯矩的共同作用而产生大量裂缝，裂缝在第五根拉索断裂后出现；（3）主梁扭矩、竖向弯矩和横向弯矩最不利截面在断索过程中的动力放大系数分别在1.09~1.55、1.21~2.05及1.21~1.76之间，最大主压应力动力放大系数在1.02~1.58之间；（4）预应力筋及拉索最大拉应力的动力放大系数分别在1~1.9及1.05~1.4之间；（5）索塔塔顶位移动力放大系数在1.23~1.65之间。

Abstract

To study the dynamic response of a long-span cable-stayed bridge to cable loss during construction, the structural behavior of the Chishi Bridge subjected to nine-cable loss caused by a fire accident was investigated in detail by dynamic nonlinear finite element simulation. The cable tension, and the displacements and damage state in the girder and pylon were measured to verify the finite element model. A comprehensive numerical study was then conducted to analyze the dynamic behavior of the cable-stayed bridge throughout the multiple-cable loss process. The results showed that: (1) the obvious change in the internal force of structure occur in only the remaining cables and part of girder within and around the cable loss area when the cable statically broken, whereas the dynamic loss of a cable cause significant responses on the entire bridge structure; (2) the loss of nine cables in the local area cause the combined action of torsion and biaxial bending in the girder, and result in dense distribution of diagonal cracks in the top slab and box girder webs, the concrete cracking may occur after the loss of five cables; (3) the dynamic amplification factors (DAF) of the maximum torque, longitudinal and transverse bending moment of girder during the accident are 1.09-1.55, 1.21-2.05 and 1.21-1.76, respectively, the DAF of maximum principal compressive stress is ranged from 1.02 to 1.58; (4) the DAF of the tensile stresses in the prestressed tendons and remaining cables are 1-1.9 and 1.05-1.4, respectively; (5) the DAF of the longitudinal displacement of the pylon top is ranged from 1.23 to 1.65.

导出引用

张羽 1，方志 1,2，卢江波 3，向宇 4，龙海滨 3. 大跨混凝土斜拉桥施工过程中结构的断索动力响应[J]. 振动与冲击, 2021, 40(5): 237-246

ZHANG Yu1, FANG Zhi1,2, LU Jiangbo3, XIANG Yu4, LONG Haibin3. Broken cable-induced dynamic response of long-span concrete cable stayed bridge during construction[J]. Journal of Vibration and Shock, 2021, 40(5): 237-246

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