高强钢筋与活性粉末混凝土粘结性能试验研究  

Experimental Study of Bond Performance Between High-Strength Rebar and Reactive Powder Concrete

作　　者：孙明德[1] 高日[1] 陈应陶[2] 高明昌[2] 

机构地区：[1]北京交通大学土木建筑工程学院,北京100044 [2]中铁第一勘察设计院集团有限公司,陕西西安710043

出　　处：《桥梁建设》2016年第6期18-23,共6页Bridge Construction

基　　金：中国铁路总公司科技研究开发计划课题(2014G010-D)~~

摘　　要：将高强钢筋应用于活性粉末混凝土结构可充分发挥两者高强度的优势,为了解高强钢筋与活性粉末混凝土的粘结应力的主要影响因素,制作立方体试件进行拔出试验,研究其粘结应力~滑移过程和破坏形式,分析钢筋粘结长度、保护层厚度、活性粉末混凝土养护龄期、钢筋屈服强度、钢筋直径、箍筋等因素对粘结性能的影响规律,并根据试验数据拟合出极限粘结应力和临界锚固长度的计算公式。结果表明:极限粘结应力随钢筋粘结长度的增大而减小;极限粘结应力随钢筋屈服强度、活性粉末混凝土标养龄期的增加而增大;极限粘结应力随钢筋直径的增大而减小,直径越大,钢筋在拔出的同时活性粉末混凝土表面越易产生裂缝;适当增加保护层厚度、配置箍筋,能够提高拔出试件的极限粘结应力。The applying of the structure can bring the advantages o play. To have an understanding of t high strength rebar to the reactive powder concrete （RPC） f the high strength of both the rebar and the RPC to the full he major factors having influences on the bond stress between the high strength rebar and the RPC, the cubic specimens were prepared and the pull-out tests for the specimens were made. The bond stress^slip process and failure modes of the specimens were studied, the laws of the influences of the rebar bond length, concrete cover thickness, RPC stand- ard curing age, rebar yield strength, rebar diameters and the stirrups on the bond performance were analyzed and in accordance with the test data, the calculation formulae for the ultimate bond stress and critical anchor length were fitted. The results demonstrate that the ultimate bond stress decreases with the increase of the rebar bond length, the stress increases with the increase of the rebar yield strength and the RPC standard curing age and the stress decreases with the increase of the rebar diameters. The larger the rebar diameters are, the more easily the cracks will occur in the surfaces of the RPC when the rebar are being pulled out and the appropriate increase of the concrete cover thickness and arrangement of the stirrups can increase the ultimate bond stress of the pull resistance of the specimens.

关 键 词：高强钢筋 活性粉末混凝土 粘结性能 拔出试验 粘结应力 临界锚固长度 

分 类 号：U448.33[建筑科学—桥梁与隧道工程] TU375[交通运输工程—道路与铁道工程]