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| Research on bonding performance of mortar bolt under the coupling action of dynamic load and corrosion |
| WANG Haitao，LIU Wei，TIAN Jiangtao，REN kun，SUN Haoyu，ZHOU Ying |
| (School of Civil Engineering，Dalian Jiaotong University，Dalian，Liaoning 116028，China) |
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Abstract In order to explore the bonding performance of mortar bolts under the coupling action of dynamic load and corrosion，the indoor dynamic pull-out test was carried out on corroded mortar bolts through the rapid corrosion test method of steel bars，and the corrosion effect，corrosion position and loading frequency and other parameters were explored The effect of the bond performance of the mortar-anchor interface is verified by modeling with ANSYS finite element software. The results show that the strain change trend of the rusted specimen and the rust-free specimen is relatively consistent. The strain and bond stress of the steel bar at the loading end increase with the increase of the load level，and expand along the anchoring area to the free end；the corrosion position is opposite to the interface The bonding performance has a greater impact. The surface shape of the steel bar at the front of the anchoring section(loading end) and the interface bonding are the most critical to the overall anchoring quality；the greater the loading frequency，the transmission distance of the strain of the steel bar and the interface bonding stress along the anchoring length also shorter；the compressive stress of the interface contact surface of the rust-free test piece and the uniformly rusted test piece is more evenly distributed along the steel bar，the interface contact pressure stress of the rust-free part of the test piece at different rust positions is larger，and the simulated value of the bonding stress is at the loading end It is slightly larger than the experimental value，and the curve distribution of the numerical simulation bond stress is smoother and uniform，but the overall distribution trend is basically consistent with the experimental results.
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2021, Vol. 40 
