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

卷:

39卷

期数:

2022年02期

页码:

61-68

栏目:

结构工程

出版日期:

2022-03-30

文章信息/Info

Title:

Study on Mechanical Behavior of GFRP-steel Composite Truss Girder with Different Structural Combination Forms

文章编号:

1673-2049(2022)02-0061-08

作者:

郝键铭,刘 远,郝宪武

(长安大学 公路学院,陕西 西安 710064)

Author(s):

HAO Jian-ming, LIU Yuan, HAO Xian-wu

(School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China)

关键词:

GFRP-钢组合桁架梁;  跨中挠度;  构件替换;  共同工作系数

Keywords:

GFRP-steel composite truss girder;  midspan deflection;  member replacement;  common working coefficient

分类号:

TU311

DOI:

10.19815/j.jace.2021.05042

文献标志码:

A

摘要:

为了研究玻璃纤维增强复合材料(GFRP)-钢组合结构的受力性能,根据各向异性体弹性力学理论确定GFRP材料的物理力学参数,依托淮河出海口闸区工作桥工程实例,利用ABAQUS建立基于板壳单元的桁架梁有限元模型,分析其受力特性。采用将部分应力较大的GFRP构件替换成钢构件的结构组合方案,对比分析了结构自重、跨中挠度、单元应力的变化情况,探索合理的杆件替换方案; 引入组合桁架梁统一抗弯刚度的概念,将桁架结构等效为单梁模型进行简化计算; 引入截面的共同工作系数以描述桁架梁腹杆对整体结构的抗弯贡献。结果表明:在基本荷载组合作用下,GFRP桁架梁的各构件应力均远小于材料的强度,有很高的安全储备; 对部分杆件的替换可以有效增加结构竖向刚度,减小在荷载作用下的跨中挠度; 将上下弦杆替换为Q345钢材的方案对增强桁架梁竖向刚度的贡献较大,且结构形式较为合理; 该研究可为类似工程的方案设计提供参考。

Abstract:

In order to study the mechanical behavior of glass fiber reinforced plastic(GFRP)-steel composite structure, the physical and mechanical parameters of GFRP material were determined according to the theory of anisotropic elasticity mechanics. Based on the engineering example of the working bridge in the Huaihe River estuary gate area, the finite element model of the truss girder based on the plate-shell element was established by ABAQUS, and the mechanical behavior were analyzed. The structural combination scheme of replacing some GFRP members with large stress into steel members was adopted, and the changes of structural self-weight, mid-span deflection and element stress were compared and analyzed to explore a reasonable member replacement scheme. The concept of unified bending stiffness of composite truss girder was introduced, and the truss structure was equivalent to single beam model for simplified calculation. The cross-section common working coefficient was introduced to describe the bending contribution of truss girder web member to integral structure. The results show that under the action of basic load combination, the stress of each component of GFRP truss girder is far less than the material strength, and there is a high safety reserve. Replacement of some members can effectively increase the vertical stiffness of the structure and reduce the midspan deflection under load. The scheme of replacing the upper and lower chords with Q345 steel has a great contribution to enhancing the vertical stiffness of the truss girder, and the structural form is reasonable. The research can provide reference for the design of similar projects.

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相似文献/References:

备注/Memo

备注/Memo:

收稿日期:2021-05-11
基金项目:陕西省自然科学基础研究计划项目(2020JM-219); 中央高校基本科研业务费专项资金项目(300102210108)
作者简介:郝键铭(1991-),男,陕西绥德人,讲师,工学博士,E-mail:jianminghao@chd.edu.cn。

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更新日期/Last Update: 2022-03-20