Stress Monitoring in Main Girder of Pre-stressed Concrete Cable-stayed Bridge by Considering Shear Lag Effect
柳舒甫 LIU Shu-fu
（黄河财产保险股份有限公司，兰州 730050）
（Yellow River Property & Casualty Insurance Co.，Ltd.，Lanzhou 730050，China）
摘要：预应力混凝土斜拉桥主梁应力监控时，若考虑剪力滞效应，进行主梁应力的监测，则理论应力与实测应力更加吻合。在某斜拉桥的施工控制中，将基于能量变分法导出的每节点两剪力滞自由度的有限梁段法理论应用到主梁的应力监控中，取得了较好的效果。因此得出在大跨度预应力混凝土桥梁的施工监控中开展剪力滞效应研究，不但突破了剪力滞理论仅应用于桥梁设计的局限性，而且进一步完善了桥梁施工监控的内容。
Abstract: When monitoring the stress of the main beam of a pre-stressed concrete cable-stayed bridge, if the shear hysteresis effect is considered and the stress of the main beam is monitored, the theoretical stress is more consistent with the measured stress. In the construction control of a cable-stayed bridge, the finite beam segment method theory based on the energy variational method with two shear lag degrees of freedom at each node was applied to the stress monitoring of the main beam, and achieved good results. Therefore, conducting research on shear hysteresis effect in the construction monitoring of large-span pre-stressed concrete bridges not only breaks through the limitations of shear hysteresis theory only applied to bridge design, but also further improves the content of bridge construction monitoring.
关键词：预应力混凝土斜拉桥；施工控制；剪力滞；应力监控
Key words: pre-stressed concrete cable-stayed bridge；construction control；shear lag；stress monitoring
中图分类号：U448.27 文献标识码：A 文章编号：1006-4311（2024）26-129-04 doi:10.3969/j.issn.1006-4311.2024.26.038
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