C型外包花纹钢-混凝土界面粘结强度推出试验研究  

Push⁃out experimental study on bond strength of checkered C⁃shaped encased steel⁃concrete interface

作　　者：陈丽华[1] 周璐洁 徐海波 董丽娟 CHEN Lihua;ZHOU Lujie;XU Haibo;DONG Lijuan(School of Civil and Hydraulic Engineering,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]合肥工业大学土木水利工程学院,合肥230009

出　　处：《建筑结构》2024年第1期17-24,共8页Building Structure

基　　金：国家自然科学基金资助项目(51778202);安徽省自然科学基金资助项目(1608085ME114)。

摘　　要：为探究带拉条式C型外包花纹钢-混凝土的粘结强度及粘结滑移性能,考虑钢板的花纹高度、混凝土强度、拉条间距、截面宽度和翼缘截面形式对试件粘结强度的影响,设计制作了12个带拉条的C型外包花纹钢-混凝土推出试件。分析各试件的破坏过程、荷载-滑移曲线、钢板应变沿纵向分布规律及特征粘结强度;综合考虑各影响因素,统计回归得出特征粘结强度的计算公式。研究结果表明:增大花纹高度是改善粘结性能最有效的途径;特征粘结强度随着混凝土强度的增大呈增大趋势,随着截面宽高比和拉条间距的增大呈减小趋势;在同等条件下,翼缘内翻试件的粘结性能优于翼缘外翻试件;特征粘结强度的回归公式能够较好地拟合试验结果。In order to investigate the bond strength and bond⁃slip properties of the checkered C⁃shaped encased steel⁃concrete with braces,and the effect of the pattern height of steel plate,concrete strength grade,the brace spacing,section width and flange form on the bond strength of specimens were taken into consideration,a total of 12 checkered C⁃shaped encased steel⁃concrete push⁃out specimens with braces were designed.The failure process,load⁃slip curves,strain of steel pipe distributed along the longitudinal direction and the characteristic bond strength of each specimen were analyzed;the calculation formula of characteristic bond strength was regressed statistically under the consideration of different effects.The experimental results show that increasing the pattern height is the most beneficial way to improve the bond strength;the characteristic bond strength increases with the increase of the concrete strength,and decreases with the increase of the section width⁃height ratio and brace spacing;under the same conditions,the bond performance of the specimens with the inward⁃bent flange is better than that of the specimens with the outward⁃bent flange.The regression formula of characteristic bond strength can well fit the test results.

关 键 词：C型外包钢 花纹钢板 特征粘结强度 推出试验 荷载-滑移曲线 

分 类 号：TU398.9[建筑科学—结构工程]