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

卷:

40卷

期数:

2023年06期

页码:

10-18

栏目:

建筑材料

出版日期:

2023-11-30

文章信息/Info

Title:

Analysis on physical properties and corrosion causes of ribbed square steel bars in Gulangyu historic building

文章编号:

1673-2049(2023)06-0010-09

作者:

石建光¹,李国聪¹,胡红梅¹,谢益人²,陈周熠¹,朱 杰¹

(1. 厦门大学 建筑与土木工程学院,福建 厦门 361005; 2. 厦门合立道工程设计集团股份有限公司,福建 厦门 361004)

Author(s):

SHI Jianguang¹, LI Guocong¹, HU Hongmei¹, XIE Yiren², CHEN Zhouyi¹, ZHU Jie¹

(1. School of Architecture and Civil Engineering, Xiamen University, Xiamen 361005, Fujian, China; 2. Xiamen Hordor Engineering Design Group Co., Ltd., Xiamen 361004, Fujian, China)

关键词:

历史建筑;  带肋方形钢筋;  微观测试;  物理性状;  锈蚀物

Keywords:

historical architecture;  ribbed square steel bar;  microscopic test;  physical property;  corrosion product

分类号:

TU375

DOI:

10.19815/j.jace.2021.11117

文献标志码:

A

摘要:

从鼓浪屿历史建筑(1920～1930年)中实地取样了3种带肋方形钢筋,采用统计分析和微观测试方法,对钢筋的物理性状和腐蚀原因进行了深入研究和分析。结果表明:鼓浪屿历史建筑中混凝土构件所用带肋方形钢筋的横肋高、横肋与纵轴夹角满足国内外现行规范要求,但横肋间距、相对肋面积不满足要求; 金相显示所用带肋方形钢筋没有发现有害的带状组织、魏氏组织以及回火马氏体组织; 从化学成分判断,所用钢材品种类似于现代的非合金钢(碳素钢),且多为低碳钢; 多数钢筋中的磷元素和硫元素含量偏高,说明当时的钢材质量等级较低; 不同历史建筑、不同混凝土构件所用方形钢筋的力学性能差异较大,1^#钢筋和2^#钢筋分别满足现行规范对于HRB400和HRB600的性能要求,但3^#钢筋不满足规范对HRB335的性能要求; 结构加固计算分析时不能仅依据钢筋的表面特征划分钢筋级别,需要对其力学性能进行检测、鉴定; 钢筋的铁锈成分比较复杂,包括Fe₃O₄、α-FeOOH、β-FeOOH、Fe₂O₃、Fe(OH)₃等多种成分,据此判断混凝土碳化、海洋环境中的氯盐侵蚀以及二者的共同作用是导致鼓浪屿历史建筑钢筋腐蚀的主要原因。

Abstract:

Three kinds of ribbed square steel bars were sampled from Gulangyu historical buildings(1920-1930),the physical properties and corrosion causes of the steel bars were studied and analyzed in-depth by statistical analysis and microscopic test methods. The results show that the transverse rib height and the angle between the transverse rib and the longitudinal axis of the ribbed square steel bars used in the concrete components of Gulangyu historical building meet the requirements of the current norms at home and abroad, but the transverse rib spacing and the relative rib area do not meet the requirements. Metallography shows that no harmful banded structure, widmanstatten structure and tempered martensite structure is found in the ribbed square steel bars. Judging from the chemical composition, the steel used is similar to modern non-alloy steel(carbon steel), and mostly low carbon steel. However, the content of phosphorus and sulfur in most steel bars is high, indicating that the quality grade of steel is low at that time. The mechanical properties of square steel bars used in different historical buildings and different concrete components are quite different. The 1^# steel bar and 2^# steel bar meet the performance requirements of HRB400 and HRB600 in the current code respectively, but the 3^# steel bar does not meet the performance requirements of HRB335 in the code. Therefore, in the calculation and analysis of structural reinforcement, the steel bars grade cannot be divided only according to the surface characteristics of reinforcement, and its mechanical properties need to be tested and identified. The composition of steel rust is more complex, including Fe₃O₄, α-FeOOH, β-FeOOH, Fe₂O₃, Fe(OH)₃ and other components, according to this, it is judged that concrete carbonation, chloride corrosion in the marine environment and the combined effect of the two are the main causes of steel corrosion in Gulangyu historical buildings.

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相似文献/References:

[1]石建光,郑雪锋,林树枝,等.灰缝厚度及水泥砂浆抹面对历史建筑砌体 结构性能的影响[J].建筑科学与工程学报,2020,37(01):67.[doi:10.19815/j.jace.2019.01017]
　SHI Jian-guang,ZHENG Xue-feng,LIN Shu-zhi,et al.Influence of Mortar Thickness and Cement Mortar Surface Strengthening on Behavior of Masonry Structure in Historical Buildings[J].Journal of Architecture and Civil Engineering,2020,37(06):67.[doi:10.19815/j.jace.2019.01017]

备注/Memo

备注/Memo:

收稿日期:2022-11-25
基金项目:厦门市鼓浪屿万石山风景名胜区管委会项目(XDHT2020145A)
作者简介:石建光(1962-),男,工学博士,教授,硕士生导师,E-mail:jgshi798@xmu.edu.cn。

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更新日期/Last Update: 2023-12-01