低强度混凝土化学植筋有效锚固长度研究.pdf

2016 年 11 月上第 45 卷第 21 期施工技术CONSTUCTION TECHNOLOGY15DOI:10.7672/sgjs2016210015低强度混凝土化学植筋有效锚固长度研究*王永泉1，张军2，景剑3，陈天骄1(1 河海大学水利水电学院，江苏南京210098;2 江苏中南建筑产业集团有限责任公司，江苏南通226100;3 河海大学土木与交通学院，江苏南京210098)摘要化学植筋是一项基于混凝土结构的新型后锚固技术，由于基础使用年限的增加和不断经受大气环境的腐蚀，设备基础混凝土强度严重降低，混凝土强度对化学植筋性能有重要影响，国内外对强度 20MPa 的混凝土化学植筋性能研究较少。为了促进化学植筋能够更加安全、广泛地应用于混凝土结构加固改造中，进行低强度混凝土化学植筋拉拔试验研究，分析了锚固深度对化学植筋极限承载力的影响。同时，采用平均黏结应力计算模型对有效锚固深度进行了理论计算，计算结果与试验值吻合良好。关键词混凝土;低强度;化学植筋;锚固;试验 中图分类号TU375 文献标识码A 文章编号1002-8498(2016)21-0015-04Effective Anchorage Length Study on Bonded ebarin Low Strength ConcreteWang Yongquan1，Zhang Jun2，Jing Jian3，Chen Tianjiao1(1 College of Water Conservancy and Hydropower Engineering，Hohai University，Nanjing，Jiangsu210098，China;2 Jiangsu Zhongnan Architecture Industry Group Co，Ltd，Nantong，Jiangsu226100，China;3 College of Civil and Transportation Engineering，Hohai University，Nanjing，Jiangsu210098，China)Abstract:Bonded rebar in concrete structure is a new technique of post-installed fastenings Because theequipment foundation is subjected to atmospheric environment corrosion and its service life is increasing，the strength of concrete which has an important influence on performance of bonded rebar will decreaseseverely But the study on performance of bonded rebar in concrete whose strength is under 20MPa isinsufficient at home and abroad In order to make bonded rebar be used more securely and widely inconcrete structure s reinforcement and reconstruction，the pull-out tests of bonded rebar in low strengthconcrete is conducted in this paper The influences of anchorage depths on the ultimate bearing capacityis analyzed On the other side，the effective anchorage depth calculated through the average stress modelis obtained to be compared with the test results，and the two results agree wellKey words:concrete;low strength;bonded rebar;anchorages;testing*国家自然科学基金项目(51409084);江苏省自然科学基金项目(BK20130836)作者简介王永泉，副教授，E-mail:wyq_hhu hhu edu cn收稿日期2016-07-040引言混凝土基材强度对化学植筋性能有着重要影响，国内外有关规范对混凝土强度做出规定:我国混凝土结构加固设计规范