非对称独塔斜拉桥的换索敏感性研究  

Sensitivity research on cable replacement for asymmetric single-pylon cable-stayed bridge

作　　者：王贤 余钱华 石桦睿 WANG Xian;YU Qianhua;SHI Huarui(College of Civil Engineering,Changsha University of Science&Technology,Changsha 410000,Hunan,China)

机构地区：[1]长沙理工大学土木工程学院,湖南长沙410000

出　　处：《工程建设》2025年第3期12-17,共6页Engineering Construction

摘　　要：为确保结构的安全并维持斜拉桥的正常运营,在其服役过程中不可避免地需要进行换索操作。然而,斜拉索的拆除会导致结构发生变化,而不同的换索方案又会直接影响换索施工过程的安全性。文章基于分区优化的理念,综合考虑拉索长度和拉索力对斜拉桥进行分区,并根据各换索方案在不同区域的敏感性表现,选取敏感性较高的指标作为评价依据,并结合施工效率,在各区域内进行方案比选。结果表明:1)在换索施工过程中,塔偏、主梁挠度以及索力变化表现得较为敏感,而主塔和主梁的应力则表现出较低的敏感性;2)长索区和中长索区索力较大,换索对结构的影响显著,施工风险较高;短索区的索力较小,换索对结构影响相对较低。本文成果可为换索方案的确定以及换索施工提供一定的借鉴与参考。In order to ensure the structure safety and maintain the normal operation of the cable-stayed bridge,it is inevitable to replace the cable during its service.However,the removal of the cable-stayed cable will lead to structural changes,and different cable replacement schemes will directly affect the safety of the cable replacement construction process.Based on the concept of zoning optimization,considering the cable length and the cable force,the cable-stayed bridge is partitioned,and according to the sensitivity performance of each cable replacement scheme in different areas,the index with higher sensitivity is selected as the evaluation basis,and the scheme is compared and selected in each area in combination with the construction efficiency.The results show that:1)In the process of cable replacement,the deviation of the tower,the deflection of the main beam and the replacement of cable force are more sensitive,while the stress of the main tower and the main beam shows a lower sensitivity.2)The cable force in the long cable area and the medium long cable area is large,and the impact of cable replacement on the structure is significant,and the construction risk is high.The cable force in the short cable area is small,and the impact of the cable replacement on the structure is relatively low.The results can provide certain references for the determination of the cable replacement scheme and the construction of the cable replacement.

关 键 词：非对称独塔斜拉桥 换索 敏感性分析 有限元分析 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]