(1 合肥工业大学土木与水利工程学院, 合肥 230009; 2 中国电子工程设计院, 北京 100142)

摘要: 为改善型钢与混凝土之间的粘结性能和协同工作能力,将花纹钢板引入型钢混凝土组合结构中,利用花纹钢板的凸起花纹来提高接触面的粘结强度. 制作了 10 个花纹工字型钢混凝土试件和 1 个普通型钢混凝土试件进行推出试验,研究花纹高度、花纹钢板设置位置和横向配箍率三个因素对粘结滑移性能的影响. 对试件的破坏过程、破坏机理以及加载端荷载⁃滑移曲线、型钢应变沿其锚固长度的分布曲线进行了分析,回归拟合出各特征粘结强度的计算公式. 试验结果表明,将花纹钢板引入型钢混凝土结构中,可显著提高型钢与混凝土接触面的粘结强度,同时试件的极限粘结强度和残余粘结强度随花纹高度和配箍率的增大而增大;花纹钢板设置在型钢不同位置时,对粘结强度的贡献不同,其中设置在型钢外翼缘对粘结强度的提高最为有利,设置在型钢内翼缘次之,设置在型钢腹板最小;建立的特征粘结强度计算公式能够较好地预测试验结果.

关键词: 型钢混凝土; 花纹型钢; 花纹钢板; 推出试验; 粘结强度

DOI:10. 19701 / j.jzjg.20190708

Bond⁃slip push⁃out test and bond strength study of checkered steelreinforced concrete composite structure

CHEN Lihua1, WANG Shiye1, LI Shuting1, LOU Yu2

(1 College of Civil Engineering, Hefei University of Technology, Hefei 230009, China;2 China Electronics Engineering Design Institute, Beijing 100142, China)

Abstract:In order to improve the performance of bond and cooperation between shape steel and concrete, checkered steelplate is introduced into steel reinforced concrete composite structure. The bond strength of the interface can be improved byusing raised figure of the checkered steel plate. Ten I⁃shape checkered steel reinforced concrete specimens and one commonsteel reinforced concrete specimen were made for push⁃out tests, and the influence of three factors such as height ofcheckered pattern, the position of checkered steel plate and the transverse stirrup ratio on the bond⁃slip performance wasstudied. The failure process, failure mechanism, load⁃slip curves at the loaded end, the curves of shape steel strain alongsteel embedded length were analyzed, and computational formulas of characteristic bond strength were deduced by statisticalregression method. The test results show that the interface bond strength between checkered steel and concrete have beensignificantly improved by introducing the checkered steel plate into the steel reinforced concrete structure, at the sametime, the ultimate bond strength and residual bond strength of specimens increase with the increase of the height ofcheckered pattern and the transverse stirrup ratio. The bond strength is different when the checkered steel plate is on thedifferent places of the shape steel, the checkered steel plate was set on the outside flange of shape steel is most beneficial tothe bond strength, the inside flange of shape steel is the second and the web of shape steel is minimal; the establishedcomputational formulas of characteristic bond strength can better predict the test results.

Keywords:steel reinforced concrete; checkered steel; checkered steel plate; push⁃out test; bond strength

∗国家自然科学基金(51778202),安徽省自然科学基金(1608085ME114).

第一作者:陈丽华,博士,副教授,主要从事钢与组合结构研究,Email:hfclh1972@ hfut.edu.cn.

[引用本文] 陈丽华,汪士也,李淑婷,等. 花纹型钢混凝土组合结构粘结滑移推出试验及粘结强度研究[ J]. 建筑结构,2022,52(8):88⁃98. CHEN Lihua,WANG Shiye,LI Shuting,et al. Bond⁃slip push⁃out test and bond strength study ofcheckered steel reinforced concrete composite structure [J]. Building Structure,2022,52(8):88⁃98.