STUDY ON SHAKING TABLE TEST OF FREESTANDING STONE CAVE DWELLING

According to the on-site investigation, taking the typical three-arch freestanding stone cave dwelling in Jingle County, Shanxi Province as the research object, the paper designed and manufactured a 1/4 model, and then carried out a shaking table test for it. The natural vibration frequency, damping ratio, acceleration amplification factor, maximum relative displacement, lateral displacement angle, base shear force and structural energy dissipation were analyzed. Test results show that the weak parts under the earthquake action are the dome and the middle kiln leg at the entrance of the side cave. With the increase of the peak acceleration of input seismic wave, the natural vibration frequency of the model decreases and the damping ratio increases. The dynamic amplification coefficients of the model changes little with the increase of the input peak acceleration. The largest dynamic amplification coefficient in the x-direction and y-direction occurs at the arch roof and kiln roof, respectively. When the input peak acceleration is 70 gal (frequent earthquakes), 200 gal (fortification earthquakes) and 440 gal (rare earthquakes), the maximum lateral displacement angle of the model occurs in the arch roof, which is 1/1618, 1/491 and 1/255, respectively. When the input peak acceleration is 600 gal, the maximum lateral displacement angle occurs in the kiln roof, which is 1/102. When the input peak acceleration is 800 gal, the maximum torsion angle of the model is 0.0037 rad. The bottom shear force and energy dissipation of the model increase with the increase of the peak acceleration of input seismic wave.