周朝阳, 肖逸鹏, 何畅,等.斜拉桥非对称V形钢塔-混凝土基座结合部构造设计优化[J].河南理工大学学报（自然科学版）,2024,43(4):177-185.

ZHOU C Y, XIAO Y P, HE C, et al.Design optimization of joint between asymmetric V-shaped steel tower and concrete base for a cable-stayed bridge[J].Journal of Henan Polytechnic University(Natural Science) ,2024,43(4):177-185.

斜拉桥非对称V形钢塔-混凝土基座结合部构造设计优化

周朝阳, 肖逸鹏, 何畅, 王兴国

1.中南大学 土木工程学院，湖南 长沙  410075;2.河南理工大学 土木工程学院，河南 焦作  454000

摘要:某空间异型斜拉桥主塔钢柱与斜撑在底部形成非对称V形结构，钢构件轴线严重偏离下部混凝土基座顶面垂线，给结合部构造设计带来困难。 目的  为了确定所采用构造方案中的众多参数，缓解塔柱到基座的刚度陡变，降低结合部各部件的应力最大值， 方法 基于精细化非线性有限元模拟，通过改变参数取值，对多种典型工况下各部件的应力进行分析、对比、验算，对于锚杆设置这一参数的影响，还研究了承压板与混凝土基座之间的界面应力。 结果 研究结果表明：张拉1~4号索的施工极端工况和平面内外弯矩绝对值相加最大的使用工况最为关键，基座混凝土主拉应力常起控制作用，塔根应力比较接近规范限值；加厚承压板、适当提高混凝土强度有利于控制锚箱钢板和基座混凝土应力；原方案锚箱中部纵横向钢板作用很小；锚杆布置位置合理远比数量重要，弯矩作用下受拉侧施加预应力能够起到有益作用。 结论 最终优化方案大量减少了锚箱钢板块数和锚杆根数，预应力分布也更合理。研究结果兼顾安全、适用和经济，对相关工程具有借鉴意义。

关键词:斜拉桥;钢塔-混凝土;预应力;有限元模拟

doi:10.16186/j.cnki.1673-9787.2023040040

基金项目:国家自然科学基金资助项目（51878664）；长沙市政府采购研究资助项目（CSCG-202107060066）

收稿日期:2023/04/20

修回日期:2023/06/16

出版日期:2024/07/15

Design optimization of joint between asymmetric V-shaped steel tower and concrete base for a cable-stayed bridge

ZHOU Chaoyang, XIAO Yipeng, HE Chang, WANG Xingguo

1.School of Civil Engineering， Central South University，Changsha  410075，Hunan，China;2.School of Civil Engineering， Henan Polytechnic University，Jiaozuo  454000，Henan，China

Abstract:An asymmetric V-shaped steel structure forms due to the intersection of a tall column and a pillar both inclined at the bottom of the main tower of a special-shaped cable-stayed bridge， and the axis of the steel member is seriously deviated from the vertical line of the top surface of the lower concrete base. These bring difficulties to the structural design of the steel-concrete joint.  Objectives In order to determine the many parameters of the adopted structural scheme， alleviate the steep change in stiffness from the pylon column to the base， and reduce the maximum stresses of each component of the joint.  Methods Based on the refined nonlinear finite element simulation， the stresses of each component under a variety of typical loading cases were analyzed， compared， and checked by changing the parameter values. The interfacial stresses between the bearing plate and the concrete base were studied for the influence of the parameter of the anchor rods setting.  Results The results show that there are two most critical loading cases，which are the extreme loading case of tensioning cables 1 to 4 and the maximum sum of the absolute values of in-plane and out-of-plane bending moments. The main tensile stresses of the concrete base often play a controlling role，and the stresses of the tower root were close to the standard limits. Thickening the bearing plate and improving the strength of concrete are beneficial to controlling the stresses of the anchor box steel plate and base concrete. However， considering the cost， moderation is key. In the original scheme， the transverse and vertical steel plates in the middle of the anchor box had little effect. A reasonable arrangement of anchor rods is far more important than quantity， and prestress applied on the tensile side under the action of bending moment can play a beneficial role.  Conclusions The final optimization scheme greatly reduces the number of anchor box steel plates and anchor rods， and the prestress distribution is more appropriate. The research results take into account safety， applicability， and economy， and have reference significance for related projects.

Key words:cable-stayed bridge;steel-concrete joint;prestress;finite element simulation