LI Cihang.Experimental Investigation on Dynamic Response of BFRP Anchorage Structure under Earthquake Effect[J].Journal of Disaster Prevention and Mitigation Engineering,2021,41(06):1212-1221.
LI Cihang.Experimental Investigation on Dynamic Response of BFRP Anchorage Structure under Earthquake Effect[J].Journal of Disaster Prevention and Mitigation Engineering,2021,41(06):1212-1221. DOI: 10.13409/j.cnki.jdpme.201907029.
Experimental Investigation on Dynamic Response of BFRP Anchorage Structure under Earthquake Effect
The study on dynamic response of the anchoring system under seismic loading mainly emphasizes on the dynamic interaction mechanism of the anchor cable and the grouting body, or the grouting body and the surrounding rock, which is the research focus and development trend in the rock and soil anchoring engineering. Through the large-scale shaking table model test, the dynamic response of the BFRP cable in anchorage body under seismic loading is studied. Using the strain gauges attached to the anchor cable, the strain waves on different anchor cable sections and different anchorage depth during dynamic loading are measured, and the axial force amplitude and residual deformation of the BFRP anchor cable caused by seismic action are analyzed. The results showed that: (1) The dynamic response of the anchor cable caused by the earthquake is basically consistent with the occurrence time and duration of the strong seismic section of the input seismic wave acceleration time history curve; (2) With the increase of the input seismic dynamic load, the peak force of the BFRP anchor cable varies with the yielding state of the slope structure, especially in the first half part of the anchorage section. (3) With the increase of the relative height of the measuring points in the anchoring structure, the influence of seismic motion on the residual axial force of the anchor cable is significant, and the phenomenon is more obvious near the end of the anchoring section. According to the preliminary distribution law of the vibration energy of the anchor cable obtained by wavelet packet decomposition, the transmission characteristics of the main frequency of the anchor cable along the anchorage depth are further discussed, and the damage mode of the BFRP anchor cable anchored structure under dynamic action is revealed.
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