方钢管再生混凝土界面粘结滑移性能试验研究  

Experimental research on the interface bond-slip behavior of recycled aggregate concrete-filled square steel tube

作　　者：张卫东[1] 王振波[2] 孙文彬[1] 何卫忠[1] 顾文虎[1] 

机构地区：[1]淮阴工学院建筑工程学院,淮安223001 [2]南京工业大学土木工程学院,南京210009

出　　处：《建筑结构》2015年第8期64-68,共5页Building Structure

基　　金：住建部科学技术项目(2008-k1-11);江苏省教育厅自然科学基金项目(11KJD560003);江苏省高校"青蓝工程"优秀骨干教师基金项目;淮阴工学院青年教师基金项目(491713329);固体废弃物再生利用技术重点实验室基金项目(HAP201302)

摘　　要：为研究方钢管与再生混凝土界面粘结滑移性能,以再生粗骨料取代率、再生混凝土强度等级及膨胀剂掺量为变化参数,进行了方钢管再生混凝土试件的推出试验,获取了试件的荷载-滑移曲线,分析了各变化参数对粘结强度的影响。在验证相关粘结强度计算模型适用性的基础上,拟合出方钢管再生混凝土的粘结强度计算公式。研究结果表明,方钢管再生混凝土荷载-滑移曲线具有相似性,均经历了四个阶段,滑移首先出现在加载端,随后发展到自由端;粘结强度随再生粗骨料取代率增大而降低,但影响较小;粘结强度随再生混凝土强度等级提高而增大,但增速趋缓;膨胀剂掺量对粘结强度影响明显,粘结强度随着膨胀剂掺量(0~15%范围内)增加呈现出先增大后降低的趋势。In order to study the interface bond-slip behavior between square steel tube and recycled aggregate concrete( RAC),push-out tests of recycled aggregate concrete-filled square steel tube( RSST) were carried out considering three parameters including the replacement rate of recycled coarse aggregate,grade of RAC and mixing amount of expansive agent. The load-slip curves were obtained and the influences of three parameters on the bond strength were analyzed. Based on the applicability test of practical formulas of bond strength,the fitting bond strength formula of RSST was suggested. The results show that the whole process curves of load-slip are similar and can be divided into four stages as follows. The initial slip at loading end develops earlier than that at the free end. With the increase of replacement rate of recycled coarse aggregate,the bond strength decreases,but the effectis small. The bond strength of RSST increases with the increase of the RAC grade but the increasing speed of bond strength is becoming slower. The mixing amount of expansive agent has significant effect on the bond strength,and the bond strength is in decreasing trend after a steady increase with the mixing amount of expansive agent from 0 to 15%.

关 键 词：方钢管再生混凝土 粘结滑移 推出试验 粘结强度 

分 类 号：TU398.9[建筑科学—结构工程]