摘要
为探究斜拉桥混合塔结合段在偏心荷载作用下的受力特点及传力机理,以福安市栖云大桥混合塔的钢-钢壳混凝土结合段为研究对象,借助试验与数值分析手段,明确结合段在偏心荷载作用下的受力性能与传力机理,并对结合段传力效率的影响因素进行参数分析。研究表明:后承压板式的斜拉桥混合塔结合段安全系数高,工作性能可靠,应力水平较低;竖向偏心荷载作用下,结合段受力性能符合偏心受压构件的受力特点,应变在截面上呈对称分布;结合段构件传力顺畅,荷载传递效率受承压板厚度及剪力连接件抗剪刚度的影响较大,传递效率随着承压板厚度或剪力连接件抗剪刚度的增大呈现先增大后趋于稳定的规律,当剪力键刚度增大至原设计抗剪刚度10倍以上或承压板厚度≥16 mm时,荷载传递效率基本保持不变;竖向偏心荷载在结合段内的传递存在明显的传力长度,超过该传力长度后,钢壳与填芯混凝土的承载比与结合段的截面刚度比基本接近,传力结束后钢壳与混凝土各自承担约50%左右的竖向荷载。
This study considers the joint segment of the hybrid tower of Qiyun Bridge in Fuan City as the research object to explore the mechanical characteristics of the hybrid tower joint segment of a cable-stayed bridge under eccentric load.It clarifies the mechanical performance and force transmission mechanism of the joint segment under eccentric load and the reasonable range of parameters affecting the force transmission efficiency using test and numerical analysis.The results indicated that the high safety coefficient,reliable working performance,and low stress level are the main characteristics of the bearing capacity of the hybrid tower joint segment with the rear bearing plate.The stress performance of the joint segment under the action of vertical eccentric load conforms to the force characteristics of eccentric compression components,and the strain is symmetrically distributed in the section.The bearing plate and the shear connector play a vital role in the load transfer,as demonstrated by the strain change of the steel plate(shell)near the bearing plate,and the shear force borne by the shear key near the bearing plate is greater than that of the stud shear key.In addition,the vertical load is effectively transmitted in the joint segment.The transfer efficiency of the load in the joint segment is greatly affected by the thickness of the bearing plate and the shear stiffness of the shear connector.The transfer efficiency in-creases initially and then tends to stabilize with the increase in the thickness of the bearing plate or the shear stiffness of the shear connector.When the shear key stiffness increases to more than 10 times the original design shear stiffness or the thickness of the bearing plate exceeds 16 mm,the load transfer efficiency remains basically unchanged.In addition,there is an apparent transmission length within the joint segment,which is about 3 m.Beyond this length,the bearing ratio of the steel shell and the filled concrete is basically close to the section stiffness ratio of the joint segment.The steel shell and the concrete,respectively,bear about 50%of the vertical load after the force transfer.The research results provide guidance and reference for the design of similar projects.
作者
孙颖
郑佳龙
卓卫东
林道锦
苏绍铃
SUN Ying;ZHENG Jialong;ZHUO Weidong;LIN Daojin;SU Shaoling(College of Civil Engineering,Fuzhou University,Fuzhou 350108,China;China Communications Highway Planning and Design Institute Company Limited,Beijing 100088,China;Fu'an City Construction Management Company Limited,Ningde 355099,China)
出处
《工程科学与技术》
北大核心
2025年第3期171-183,共13页
Advanced Engineering Sciences
基金
福建省建设科技研究开发项目(2020-K-114)。
关键词
斜拉桥混合塔
结合段
受力性能
传力机理
模型试验
有限元分析
hybrid tower of cable-stayed bridge
joint segment
force performance
load transfer mechanism
model test
FE analysis
作者简介
孙颖(1981—),女,助理研究员.研究方向:新型桥梁结构体系结构性能、桥梁耐久性、桥梁抗震性能.E-mail:sunying@fzu.edu.cn;通信作者:卓卫东,教授,E-mail:zhuowd@fzu.edu.cn。
