期刊论文

Experimental Investigation of Strong Torsion Damage to Box Girder of a Concrete Cable-Stayed Bridge

中文

桥梁建设

1003-4722

2017

47

6

78-83

10.3969/j.issn.1003-4722.2017.06.014

(2015CB057706):国家重点基础研究发展计划(973计划)项目 (51678068,51678070):国家自然科学基金项目 (Program 973)(2015CB057706):Project of National Key Fundamental Research Development Program (51678068,51678070):Projects of National Natural Science Foundation of China

本校为第一机构

某大跨斜拉桥主梁采用预应力混凝土箱梁,在施工过程中因火灾烧断主梁一侧9根斜拉索导致主梁强受扭损伤。为研究主梁强受扭损伤后的受力性能,设计制作相似比为1∶4的节段模型进行强受扭损伤模拟试验,并采用有限元程序Abaqus对模型梁的受扭损伤过程进行模拟分析,研究断索后主梁的强受扭损伤状态,评估主梁损伤后的抗扭承载力及索力恢复后的弯曲性能。结果表明:模型梁强受扭损伤后的裂缝宽度、间距和角度与实桥高度相似,与有限元计算的损伤状态也一致;模型梁实测扭转变形与计算扭转变形及实桥控制截面扭转变形吻合较好;实桥断索时主梁所受最大扭矩荷载约为其抗扭承载力的75%;索力恢复后,主梁的抗弯刚...

The main girder of a long span cable-stayed bridge is the prestressed concrete box girder. In the construction of the bridge, 9 stay cables on the one side of the girder were burnt and broken in a fire and the breaking of the cables caused the girder to suffer the strong torsion damage. To investigate the mechanical behavior of the girder after the torsion damage, the sectional model beam of a similarity ratio of 1∶4 was designed and fabricated and the simulation tests of the damage were carried out. The torsion damage process of the beam was ...