带衬套灌浆锚杆在砖砌体中拉拔性能试验研究
Experimental Research on Pull-Out Performance of Grouted Anchor Rods with Bushings Inside Brick Masonry
敬登虎 1朱其一 1石运 2汪方勇3
作者信息
- 1. 东南大学土木工程学院,南京 211189
- 2. 中国建筑科学研究院有限公司,北京 100013
- 3. 江苏筑镹营造科技有限公司,南京 210019
- 折叠
摘要
带衬套灌浆锚杆是一种可用于加固修复且不改变大体积砖砌体文物建筑外貌的新型技术.为了研究带衬套灌浆锚杆在砖砌体中的拉拔性能,以灰缝饱满度、锚固深度、钻孔直径以及锚固方向为研究参数,设计并完成了 21 根锚杆的拉拔试验,分析了锚杆的破坏形态、拔出力-滑移曲线、锚筋应变和界面黏结应力分布以及峰值拔出力.试验结果表明:带衬套灌浆锚杆与砖砌体的拔出力-滑移曲线呈现明显的四段线特征;锚杆中锚筋不易屈服;灰缝饱满度和钻孔直径对锚杆的破坏形态有直接影响;锚杆的峰值拔出力与锚固深度存在非线性增长关系;灰缝饱满度高、钻孔直径大,锚杆的峰值拔出力高;竖向锚杆的峰值拔出力明显高于水平向锚杆.
Abstract
The technique of grouted anchor rods with bushings is a new strengthening and repair technique that can be used for repairing mass brick masonry ancient buildings without damaging their appearance.In order to study the pull-out performance of grouted anchor rods inside historic masonry,pull-out tests on 21 anchor rods with the fullness of mortar joints,anchoring depth,drilling diameter and anchorage direction as research parameters were designed and completed,and the failure modes of anchor rods,pull-out force-slip curves,the distribution of anchor bar strains as well as interface bonding stresses and peak pull-out forces were analyzed.The test results showed that the pull-out force-slip curves of grouted anchor rods with bushings exhibited distinct four-stage characteristics;the anchor bars within the anchor rods showed resistance to yielding;the failure modes of anchor rods were directly affected by the fullness of mortar joints and the drilling diameter;the peak pull-out forces of anchor rods had a non-linear growth relation with the anchorage depth;the peak pull-out forces of anchor rods with high fullness of mortar joints and large drilling diameter were high;and compared with horizontal anchor rods,the peak pull-out forces of vertical anchor rods were significantly higher.
关键词
带衬套灌浆锚杆/砖砌体/灰缝饱满度/锚固深度/钻孔直径/拉拔性能Key words
grouted anchor rod with bushing/brick masonry/fullness of mortar joint/anchoring depth/drilling diameter/pull-out performance引用本文复制引用
出版年
2024
NETL
NSTL
维普
万方数据