高强钢筋与超高性能混凝土黏结性能试验研究  

Bond characteristics between high strength bars and ultra-high performance concrete

作　　者：胡翱翔 梁兴文[2] 史庆轩[2] 陈宜言[3] 陈宝春[3] 王群[1] 李睿璞[1] HU Aoxiang;LIANG Xingwen;SHI Qingxuan;CHEN Yiyan;CHEN Baochun;WANG Qun;LI Ruipu(School of Architecture and Environmental Engineering,Shenzhen Polytechnic,Shenzhen 518055,China;School of Civil Engineering,Xi′an Univ.of Arch.&Tech.,Xi′an 710055,China;College of Civil Engineering,Fuzhou University,Fuzhou 350108,China)

机构地区：[1]深圳职业技术学院建筑与环境工程学院,广东深圳518055 [2]西安建筑科技大学土木工程学院,陕西西安710055 [3]福州大学土木工程学院,福建福州350108

出　　处：《西安建筑科技大学学报（自然科学版）》2021年第4期534-544,610,共12页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：国家自然科学基金项目(51278402,52078305,20YJCZH074)。

摘　　要：为研究高强钢筋与超高性能混凝土(UHPC)的黏结性能,考虑钢筋直径、锚固长度以及保护层厚度等因素对黏结性能的影响,设计了15组45个常温养护条件下的中心拔出试件;通过中心拔出试验,观察试件在静力荷载作用下的破坏过程、裂缝的产生、试件破坏形态以及黏结应力-滑移曲线特征等.结果表明:高强钢筋与UHPC黏结强度较大,约为48~73 MPa;与普通混凝土不同的是钢筋与UHPC的黏结强度随着钢筋直径的增加而增加;黏结强度与保护层厚度成正比,与黏结长度成反比;保护层厚度对试件破坏模式影响较大,保护层厚度较薄时,试件发生劈裂;保护层厚度较大时试件发生拔出破坏.钢筋在拔出的过程中黏结应力-滑移曲线与坐标横轴围成的面积较大,表明其耗能能力较强.基于试验结果,结合黏结机理分析提出了黏结强度计算模型以及黏结-滑移本构方程,理论计算结果与试验结果吻合较好.Pullout test was conducted to investigate the bond characteristics of high strength steel bars embedded in Ultra-High Performance Concrete(UHPC)considering bar diameter,bar embedment length and concrete cover.Measurements included pullout force and slip at free end of the rebar,and crack patterns were monitored and bond failure modes were observed.Some new results had been found in this test.The bond strength increased with an increase in the bar diameter.The thickness of concrete cover had a significant effect on the bond failure type.UHPC had tremendous energy absorb capacity due to the debonding and pullout of steel fibers from the concrete.Analytical models for the evaluation of bond strength and constitute relationship of the bond stress-slip curves are proposed based on the test results,which agree well with the experimental results.

关 键 词：高强钢筋 UHPC 中心拔出试验 黏结应力-滑移本构方程 

分 类 号：TU375[建筑科学—结构工程]