大跨度钢管混凝土系杆拱桥吊杆索力分析

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振动与冲击 ›› 2023, Vol. 42 ›› Issue (17) : 306-313.

论文

大跨度钢管混凝土系杆拱桥吊杆索力分析

王宪玉1,2，王兴武2，梁孝3，周敏4，杜永峰1

作者信息 +

Analysis of suspension cable force of large-span steel tube concrete tied arch bridge

WANG Xianyu1,2, WANG Xingwu2, LIANG Xiao3, ZHOU Min4, DU Yongfeng1

Author information +

文章历史 +

摘要

针对大跨度钢管混凝土系杆拱桥吊杆索力问题，在基于能量法推导不同约束条件索力公式的基础上，结合工程实例，从吊杆设计阶段索力的优化、成桥阶段索力的实测、运营阶段索力抗弯刚度的影响三个方面进行系统分析并给予相应优化建议。研究结果表明：应用能量法推导的索力公式是可行的；设计阶段优化后吊杆索力更为均匀、系梁位移更加合理；应用频率法测试吊杆索力时，测试点位宜放在吊杆L/6~L/4处，尽可能远离吊杆两端并避免放在阵型的模态节点处，以减少端部低频信号对基频的影响及出现“漏频”现象；吊杆计算抗弯刚度与运营阶段实际抗弯刚度存在差异，导致索力测量值与结构实际索力存在较大差异，针对这一问题提出成桥阶段应测量吊杆实际抗弯刚度的方法，可有效减小索力测量误差，为桥梁运营阶段索力的准确测试提供计算依据。

Abstract

Aiming at the problem of hanger forces of long-span concrete-filled steel tube tied arch bridges, the solution to this problem should be based on the derivation of the cable force formulas with different constraints which is based on the energy method, combined with engineering examples. System analysis and corresponding optimization suggestions should also be given in three aspects: Firstly, the optimization of the cable force during the design phase of the suspender. Secondly, the actual measurement of the cable force during the bridge formation. Thirdly, the influence of the bending stiffness of the cable force in the operation stage. The analysis results show that the cable force formula derived by the energy method is feasible. After optimization in the design phase, the cable force of the boom is more uniform and the displacement of the tie beam is more reasonable. When the frequency method is used to test the cable force of the boom, the test point should be placed At L/6~L/4 of the boom, which should be stayed as far away from the two ends of the boom as possible and avoid placing it at the modal node of the formation to reduce the impact of the low-frequency signal at the end on the fundamental frequency and the phenomenon of "leakage". There is a difference between the calculated flexural stiffness of the suspender and the actual flexural stiffness in the operation stage, which leads to the great difference between the measured cable force and the actual structural cable force. Aiming at this problem, the method of measuring the actual flexural stiffness of the suspender in the completion stage is proposed, which effectively reduces the measurement error of cable force, and provides calculation basis for accurate measurement of cable force in bridge operation stage.

导出引用

王宪玉1,2，王兴武2，梁孝3，周敏4，杜永峰1. 大跨度钢管混凝土系杆拱桥吊杆索力分析[J]. 振动与冲击, 2023, 42(17): 306-313

WANG Xianyu1,2, WANG Xingwu2, LIANG Xiao3, ZHOU Min4, DU Yongfeng1. Analysis of suspension cable force of large-span steel tube concrete tied arch bridge[J]. Journal of Vibration and Shock, 2023, 42(17): 306-313

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