多肢钢管-钢管混凝土复合主塔钢混结合段受力性能分析  

Mechanical Performance Analysis of Steel-Concrete Composite Section in Multi-Limb CHS-CFST Built-Up Main Tower

作　　者：吴庆雄[1,2] 李博 袁辉辉 黄育凡[1] WU Qingxiong;LI Bo;YUAN Huihui;HUANG Yufan(l.Department of Civil Engineering,Fuzhou University,Fuzhou 350116,China;Fujian Provincial Key Laboratory on Multi-Disasters Prevention and Mitigation in Civil Engineering,Fuzhou 350116,China;Key Laboratory of Civil Engineering-Fujian Province University,Fuzhou 350116,China)

机构地区：[1]福州大学土木工程学院,福州350116 [2]福建省土木工程多灾害防治重点实验室,福州350116 [3]工程结构福建省高校重点实验室,福州350116

出　　处：《结构工程师》2021年第3期11-18,共8页Structural Engineers

基　　金：国家自然科学基金面上项目(51978169);福建省交通运输科技项目(202034);福州市科技计划项目(2019-G-41)。

摘　　要：某部分斜拉桥的异型主塔采用多肢钢管-钢管混凝土复合结构,在其塔底钢混结合段5根钢管混凝土塔柱相贯焊接在钢筋混凝土塔座的加劲板上,结构十分复杂。为分析钢混结合段的受力性能,利用通用有限元软件ABAQUS建立精细化三维实体有限元模型,并充分考虑结构复杂的空间几何形状、网格划分精度材料非线性、部件之间的接触关系以及边界条件等问题。最不利荷载工况下的荷载分析结果表明:钢混结合段整体受力较为均衡,变形连续协调;塔柱钢管应力均小于屈服强度,中塔柱与次塔柱相贯处出现较为明显的应力集中现象,管内混凝土局部出现较大的拉应力;管底钢板和加劲板的应力由边缘至中心逐渐增加,最大应力点均位于中塔柱和次塔柱交界处;混凝土塔座未出现开裂或压碎现象,但与管底钢板和加劲板相交处易出现应力集中现象。研究结果可为其他相似工程中钢混结合段的设计与施工提供参考。The irregular-shaped pylon of an extradosed cable-stayed bridge adopted multi-limb CHS-CFST built-up structure.At the bottom of the pylon,five CFST limbs were intersected and welded to the stiffening plate embedded in the reinforced concrete(RC)tower base to form a complex steel-concrete composite section.To analyze the mechanical performance of the steel-concrete composite section,the common finite element software ABAQUS was used to establish a refined 3D solid finite element model,and fully considered the complex spatial geometry,meshing accuracy,material nonlinearity,contact relationship between components and boundary conditions.The stress analysis results under the most unfavorable load conditions showed that the steel-concrete joint section had been stressed uniformly and deformed coordinately.The stress of the steel pipe of the tower limb was less than the yield strength.The obvious stress concentration occurred at the intersection of the middle and the secondary tower limbs,and the concrete inside the tube had a relatively large tensile stress.The stress of the bottom steel plate and stiffening plate gradually increased from the edge to the center,and the maximum stress points were located at the junction of the middle and the secondary tower limbs.The concrete tower base had no cracking or crushing phenomenon,but stress concentration was prone to occur at the intersection of the bottom steel plate and stiffening plate.The research results of this paper could provide reference for the design and construction of steel-concrete composite sections in other similar projects.

关 键 词：多肢钢管混凝土 异型主塔 钢-混结合段 三维实体有限元模型 应力分析 

分 类 号：U441[建筑科学—桥梁与隧道工程]