斜拉桥无拉板式索塔锚固结构的疲劳性能分析  

Fatigue Performance Analysis of the Anchorage Structure of Cable Pylon Without Tension Plate in Cable-stayed Bridges

作　　者：郑宏利 王晓岭 陈恒 王晓明[2] ZHENG Hongli;WANG Xiaoling;CHEN Heng;WANG Xiaoming(China Railway 16th Bureau Group Road&Bridge Engineering Co.,Ltd.,Beijing 101520,China;School of Highway,Chang'an University,Xi'an,Shaanxi 710064,China)

机构地区：[1]中铁十六局集团路桥工程有限公司,北京101520 [2]长安大学公路学院,陕西西安710064

出　　处：《公路工程》2025年第1期80-88,共9页Highway Engineering

基　　金：国家自然科学基金资助项目(52178104)。

摘　　要：斜拉桥的索塔锚固部位受力集中、构造复杂,在桥梁运营过程中受到循环往复的荷载作用,其疲劳性能成为控制结构安全的关键因素之一。部分桥塔因造型空间线性限制、两侧吊索角度方向不对称及桥塔高度方向差异,常采用无拉板式索塔锚固结构,此结构因其独特的构造特征和受力响应,使得研究大部分聚焦在其受力特征和传力机理上,较少进行疲劳性能的研究。为防止此类结构发生脆性的疲劳破坏,更好地适应现代桥梁造型的需要,以某斜拉桥为例通过现行规范及标准、ABAQUS、FE-SAFE有限元模拟及实测对照对此结构进行疲劳性能探讨和参数优化,探寻不同工况下此结构的疲劳寿命。研究结果表明:无拉板式索塔锚固结构的钢塔壁部分截面承受着非常不规则拉应力和压应力的交替变化,钢桥塔塔壁有明显的向平面内外两侧的鼓曲变形;疲劳寿命最低部位出现在钢锚箱与钢塔壁连接部位的焊缝处;相较于初始板厚40 mm,增加板厚将会提高结构的疲劳寿命,在锚固梁厚度为45 mm时疲劳寿命的计算结果上升幅度较大,由45 mm增加到50 mm时,计算结果与45 mm时无明显变化,因此在锚固梁厚度为45 mm时疲劳性能最佳,且比50 mm时节省钢材用量,可达到优化的效果。研究可为此类结构在工程应用上的疲劳设计提供有益借鉴。The anchorage part of the cable tower of a cable-stayed bridge is subjected to concentrated forces and complex structures,and is subjected to cyclic loads during bridge operation.Its fatigue performance has become one of the key factors controlling structural safety.Due to linear limitations in the shape space,asymmetry in the angle and direction of the suspension cables on both sides,and differences in the height and direction of the bridge towers,some bridge towers often adopt a non tension plate cable tower anchoring structure.Due to its unique structural characteristics and stress response,most research focuses on its stress characteristics and transmission mechanism,and there is less research on fatigue performance.In order to prevent brittle fatigue failure of such structures and better adapt to the needs of modern bridge design,this article takes a cable-stayed bridge as an example to explore the fatigue performance and parameter optimization of this structure through current specifications and standards,ABAQUS,FE-SAFE finite element simulation,and actual measurement comparison,and to explore the fatigue life of this structure under different working conditions.The research results indicate that the section of the steel tower wall of the anchor structure of the non tension plate cable tower bears a very irregular alternating change of tensile and compressive stress,and the steel bridge tower wall has obvious bulging deformation towards the inner and outer sides of the plane;the lowest part of fatigue life occurs at the weld joint between the steel anchor box and the steel tower wall;compared to the initial plate thickness of 40 mm,increasing the plate thickness will improve the fatigue life of the structure.When the anchor beam thickness is 45 mm,the calculated fatigue life increases significantly.When the anchor beam thickness increases from 45 mm to 50 mm,there is no significant change in the calculated results compared to 45 mm.Therefore,when the anchor beam thickness is 45mm,the fatigue performance is

关 键 词：桥梁与隧道工程 斜拉桥 钢桥塔索塔锚固结构 无拉板式钢锚箱 疲劳分析 结构优化 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]