基于足尺地震试验的木骨泥塑数值模拟方法研究OA

Most major cave-temple sites in China are located in seismic design zones of intensity VI or higher,where earthquakes pose a severe threat to fragile statues.The Maijishan Grottoes have histori-cally been significantly affected by strong earthquakes.To clarify the seismic response mechanisms and failure modes of timber-armature clay statues,this study selected the Rahula statue in Cave 133 of the Maijishan Grottoes as the representative object,as it has the highest scale proportion and the most typical structural characteristics.Based on three-dimensional scanning and nondestructive investiga-tion,a full-scale two-legged standing timber-armature clay sculpture model was fabricated.Shaking-ta-ble tests were conducted to simulate its response and damage characteristics under historical earth-quake actions in high-intensity seismic regions.The results showed that,although the model under-went large rocking displacements during earthquakes,it exhibited good overall seismic performance.Both acceleration and displacement were amplified by several times along the height.The overall dam-age evolution proceeded through four stages:(1)tension cracking at variable-section regions,(2)crack propagation to through-cracks,(3)splitting of the surface layer of the wooden armature,and(4)shear fracture of the armature.During loading,the natural frequency decreased progressively with structural damage,and the largest reduction occurred after the splitting of the surface layer of the wooden arma-ture.Based on the experimental data,a numerical-simulation-based evaluation methodology for tim-ber-armature clay sculptures was established,providing a theoretical basis for health diagnosis and safety assessment of such statues.