低强度混凝土化学植筋有效锚固长度研究

Effective Anchorage Length Study on Bonded Rebar in Low Strength Concrete

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。

Bonded rebar in concrete structure is a new technique of post-installed fastenings. Because the equipment 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 decrease severely. But the study on performance of bonded rebar in concrete whose strength is under 20MPa is insufficient at home and abroad. In order to make bonded rebar be used more securely and widely in concrete structure＇ s reinforcement and reconstruction, the pull-out tests of bonded rebar in low strength concrete is conducted in this paper. The influences of anchorage depths on the ultimate bearing capacity is analyzed. On the other side, the effective anchorage depth calculated through the average stress model is obtained to be compared with the test results, and the two results agree well.