Experimental study and finite element analysis on elastic properties of GFRP-RPC composite double deck traffic beam bridge

ZHU Mingqiao; LI Jun; LI Zhibin

doi:10.11835/j.issn.2096-6717.2021.082

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Experimental study and finite element analysis on elastic properties of GFRP-RPC composite double deck traffic beam bridge

Civil Engineering | 更新时间：2023-06-25

- Experimental study and finite element analysis on elastic properties of GFRP-RPC composite double deck traffic beam bridge
- Journal of Civil and Environmental Engineering Vol. 45, Issue 1, Pages: 199-208(2023)
- 作者机构：
  
  1.湖南科技大学，土木工程学院，湖南湘潭 411201
  2.湖南科技大学，湖南省智慧建造装配式被动房工程技术研究中心，湖南湘潭 411201
- 作者简介：
  
  ZHU Mingqiao (1968- ), PhD, professor, main research interest: bridge engineering, E-mail: 1531290279@qq.com.
- 基金信息：
  
  National Natural Science Foundation of China(51578236);Open Fund of Key Laboratory Foundation of Hunan(19K033);Natural Science Foundation of Hunan Province(2020JJ4313)
- DOI：10.11835/j.issn.2096-6717.2021.082
  CLC： U443.35;U448.12
- Received：18 December 2020，
  
  Published：25 February 2023
- 稿件说明：
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ZHU Mingqiao, LI Jun, LI Zhibin. Experimental study and finite element analysis on elastic properties of GFRP-RPC composite double deck traffic beam bridge[J]. Journal of Civil and Environmental Engineering, 2023, 45(1): 199-208.
DOI：

ZHU Mingqiao, LI Jun, LI Zhibin. Experimental study and finite element analysis on elastic properties of GFRP-RPC composite double deck traffic beam bridge[J]. Journal of Civil and Environmental Engineering, 2023, 45(1): 199-208. DOI： 10.11835/j.issn.2096-6717.2021.082.

摘要

设计了一种面向双层交通的GFRP-RPC组合梁桥，该梁桥由GFRP材质的两榀桁架及带肋平板通过胶栓混合连接而成，通过浇筑自密实RPC混凝土形成组合梁桥整体。对组合梁桥缩尺模型（1:8）进行多工况的拟静力加载试验和有限元分析，并对其弹性工作性能进行研究。结果表明：浇筑RPC后，梁桥的刚度约提高2.6倍，表明此类GFRP、混凝土组合形式有利于结构合理受力，下部加载时，梁桥变形约增大10%，对结构较不利；弦杆受力符合平截面假定，组合结构受力合理；上、下弦杆分别为压弯、拉弯受力状态，上、下部加载时，下弦杆拉应力分别约为上弦杆的1.5倍和2.5倍，下弦杆为薄弱弦杆；斜腹杆受拉，直腹杆基本呈受压状态，上、下加载方式影响直腹杆的受力形式，下部承载设计时需考虑局部拉、压应力较大的情况；顶板侧面混凝土受压，底板侧面混凝土受拉，腹杆设置有利于板面混凝土均匀受力。

Abstract

A GFRP-RPC composite beam bridge for double deck traffic is designed. The bridge is composed of two GFRP trusses and ribbed plates

which are connected by glue bolts. The composite beam bridge is formed by pouring self compacting RPC concrete. The scale model (1:8) of composite beam bridge is tested and analyzed by quasi-static loading test and finite element method

and its elastic performance is studied. The results show that: After pouring RPC

the stiffness of the beam bridge increases about 2.6 times

which indicates that the combination of GFRP and concrete is conducive to the reasonable stress of the structure

and the deformation of the beam bridge increases about 10% when the lower part is loaded

which is unfavorable to the structure; the chord stress accords with the assumption of plane section

and the stress of composite structure is more reasonable; the upper and lover chords are in the force state of compression bending and tensile bending respectively

when the upper and lower chords are loaded

the tensile stress of the lower chords is about 1.5 and 2.5 times of that of the upper chords

and the lower chords are weak chords; when the diagonal web member is in tension

the straight web member is basically in compression state

and the loading mode of up and down affects the stress form of the straight web member. The design with larger local tensile and compressive stress should be considered for the lower bearing; the concrete on the side of the top plate is compressed

while the concrete on the side of the bottom plate is tensioned

indicating that the setting of the web member is conducive to the uniform stress of the slab concrete.

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