主动封存CO2 的FRP筋海水海砂混凝土梁正截面受弯承载力计算方法

郭冰冰; GUO Bingbing; 路鹏超; LU Pengchao; 于琦; YU Qi; 王艳; WANG Yan; 牛荻涛; NIU Ditao

doi:10.48014/ems.20231224001

主动封存CO2 的FRP筋海水海砂混凝土梁正截面受弯承载力计算方法

Calculation for Bearing Capacity of FRP-SSC Beams in Positive Section with Active CO2 Storage

工程材料与结构 2024年第3卷第2期页码[25-37] 下载全文[5.1MB] [HTML]

摘要

随着我国“海洋强国”战略的全面实施, FRP增强海水海砂混凝土 (FRP-SSC) 结构能够缓解淡水和河砂等自然资源的日渐枯竭, 具有显著的就地取材优势, 将有广阔的应用前景。而碳化养护FRP-SSC结构, 可实现CO2高附加值利用与主动封存, 且可以降低SSC内部碱性环境对FRP筋长期耐久性的不利影响。本文提出将FRP-SSC梁截面分为碳化区和非碳化区两种力学性能不同的混凝土, 根据梁截面的内力平衡和变形协调, 建立封存CO2的FRP-SSC梁正截面抗弯承载力的计算方法, 并结合有限元数值模型, 研究碳化深度对FRP-SSC梁抗弯承载力的影响规律。结果表明, 对于受压破坏 (较理想破坏模式) 的FRP-SSC梁, CO2封存可提高该破坏模式下承载力的7. 75%; 鉴于当配筋率从0. 74%增加到1. 12%, 理想破坏模式下其承载力仅提高16. 7%, 所以CO2封存在一定情况下可显著提升正截面受弯承载性能。当FRP-SSC梁发生受拉破坏时, CO2封存对其抗弯承载力影响较小。

Abstract

With the comprehensive implementation of the China’s“Maritime Power”strategy, the utilization of FRP reinforced seawater-sea sand concrete (FRP-SSC) structures presents significant potential in alleviating the depletion of natural resources such as freshwater and river sand. The noteworthy advantage lies in its ability to locally sourced materials, thus offering substantial application prospects. Carbonation curing for FRP-reinforced seawater-sea sand concrete (FRP-SSC) structures on the other hand, can achieve highadded- value utilization and active storage of CO2, and reduce the adverse impact of the alkaline environment inside the SSC on the long-term durability of FRP bars. In this paper, it is proposed to divide the section of FRP-SSC beams into two kinds of concrete with different mechanical properties, carbonated and non-carbonated zones. According to the internal force balance and deformation coordination of the beam section, a calculation method for the flexural capacity of FRP-SSC beams with active CO2 storage is established. Finite element numerical model also is employed. Then, the influence law of carbonation depth on the flexural capacity of FRP-SSC beams is discussed. The results show that for FRP-SSC beams subjected to compression failure (more ideal mode of damage) , CO2 storage can increase the flexural capacity by 7. 75%. Considering that the flexural capacity in the ideal mode of damage is increased only by 16. 7% when the reinforcement ratio increases from 0. 74% to 1. 12%, CO2 storage shows a considerable improvement in the flexural capacity of FRP-SSC beams under certain circumstances. When FRP-SSC beams undergo tensile damage, CO2 storage has less effect on their flexural capacity.

DOI

10.48014/ems.20231224001

文章类型

研究性论文

收稿日期

2023-12-24

接收日期

2024-01-21

出版日期

2024-06-28

关键词

FRP筋海水海砂混凝土结构, CO2封存, 受弯承载性能, 理论计算

Keywords

FRP-reinforced Seawater-sea Sand Concrete(FRP-SSC)structure, CO2 storage, Flexural capacity, Theoretical calculation

作者

郭冰冰^1,2,*, 路鹏超¹, 于琦³, 王艳², 牛荻涛^1,2

Author

GUO Bingbing^1,2,*, LU Pengchao¹, YU Qi³, WANG Yan², NIU Ditao^1,2

所在单位

1. 西安建筑科技大学土木工程学院, 西安 150010
2. 西安建筑科技大学绿色建筑全国重点实验室, 西安 150010
3. 青岛青建新型材料集团, 青岛 266041

Company

1. College of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an 150010, China
2. State Key Laboratory of Green Building, Xi'an University of Architecture and Technology, Xi'an 150010, China
3. Qingdao Qingjian New Material Group Co. LTD, Qingdao 266041, China

浏览量

523

下载量

206

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引用本文

郭冰冰, 路鹏超, 于琦, 等. 主动封存CO2 的FRP筋海水海砂混凝土梁正截面受弯承载力计算方法[J]. 工程材料与结构, 2024, 3(2): 25-37.

Citation

GUO Bingbing, LU Pengchao, YU Qi, et al. Calculation for bearing capacity of FRP-SSC beams in positive section with active CO2 storage[J]. Engineering Materials and Structures, 2024, 3(2): 25-37.