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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

42卷

期数:

2025年01期

页码:

148-156

栏目:

桥隧结构

出版日期:

2025-01-20

文章信息/Info

Title:

Mechanism analysis of force transfer at joint of asymmetric V-shaped steel pylon and concrete base of cable-stayed bridge

文章编号:

1673-2049(2025)01-0148-09

作者:

肖逸鹏,周朝阳,何 畅,陈世杰,刘一江

(中南大学 土木工程学院,湖南 长沙 410075)

Author(s):

XIAO Yipeng, ZHOU Chaoyang, HE Chang, CHEN Shijie, LIU Yijiang

(School of Civil Engineering, Central South University, Changsha 410075, Hunan, China)

关键词:

斜拉桥;  钢-混结合部;  有限元分析;  界面应力;  传力机理

Keywords:

cable-stayed bridge;  steel-concrete joint;  finite element analysis;  interfacial stress;  force transfer mechanism

分类号:

U443

DOI:

10.19815/j.jace.2023.04133

文献标志码:

A

摘要:

为缓解塔柱到基座的刚度陡变,提出了在钢塔底部箱形截面内设置U形加劲肋的局部构造优化方式并建立了有限元模型,计算了混凝土承台、基座、钢锚箱及钢塔临底区域的应力,在此基础上,分析了塔底-承压板连接处应力以及箱内焊缝缺陷的影响,研究了承压板与混凝土基座之间的界面应力,探讨了各部件对结合部内力传递的贡献。结果表明:在钢塔底部箱内设置U形加劲肋可有效降低钢塔底部应力峰值,在典型最不利荷载组合下,钢-混结合部各部分应力均未超限; 在最小轴力和最大弯矩工况下,柱底壁板、肋板与承压板之间焊缝沿线以受压为主,且满足焊缝强度要求; 当柱底箱内焊接存在质量缺陷时,附近壁板和承压板应力增加,但肋板与承压板连接处仍能传递部分压力; 两种工况下承压板与混凝土基座之间均无脱开风险; 塔底竖向压力主要依靠承压板直接传给混凝土,而剪力大多通过锚箱传递。

Abstract:

In order to alleviate the stiffness steep change from the pylon column to the base, a local structural optimization method of setting U-shaped stiffeners in the box section at the steel pylon bottom was proposed and the finite element model was established. The stress of the concrete cap, base, steel anchor box and steel pylon bottom area were calculated. On the basis, the stress at the connection between the pylon bottom and bearing plate and the influence of the weld defects in the box were analyzed. The interfacial stress between the bearing plate and the concrete base was studied, and the contribution of each component to the internal force transfer of the joint was discussed. The results show that setting U-shaped stiffeners in the bottom box of the steel pylon can effectively reduce the peak stress. Under the typical most unfavorable load combination, the stresses of each part of the steel-concrete joint do not exceed the limit. Under the condition of minimum axial force and maximum bending moment, the weld between the column bottom panel, the rib plate and the bearing plate is almost under pressure and can meet the weld strength requirements. When there are quality defects in the welding inside the column bottom box, the stress in the nearby panel and bearing plate increases, but part of the pressure can still be transmitted at the connection between the rib plate and the bearing plate. There is no detachment risk between the bearing plate and the concrete base under two load conditions. The vertical pressure at the pylon bottom is mainly transmitted to the concrete directly by the bearing plate, while the shear force is mostly transmitted through the anchor box.

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备注/Memo

备注/Memo:

收稿日期:2023-04-15
基金项目:长沙市政府采购研究项目(CSCG-202107060066)
作者简介:肖逸鹏(1995-),男,工学博士研究生,E-mail:1062911131@qq.com。
通信作者:何 畅(1992-),男,工学博士,副教授,E-mail:hechang@csu.edu.cn。Author resumes: XIAO Yipeng(1995-), male, doctoral student, E-mail: 1062911131@qq.com; HE Chang(1992-), male, PhD, associate professor, E-mail: hechang@csu.edu.cn.

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更新日期/Last Update: 2025-01-20