Finite Element Modeling Method and Seismic Performance Analysis of Grottoes Based on Point Cloud Data
In order to study the stability and seismic performance of grottoes, a method of reverse modeling is proposed. Based on the 3D laser scanning data of a grotto, a high-precision 3D finite element analysis model of complex grottoes from the physical entity of real space to the virtual space is constructed. Based on ABAQUS, the gravity and seismic dynamic simulation of the grotto are carried out, and the stress and strain characteristics, acceleration response and displacement response of grotto are analyzed. The results show that the grotto is in an elastic state under the effect of gravity and frequent earthquake. Under the effect of rare earthquake, the grotto appears plastic deformation and the arch foot appeared tensile failure. Under the effect of frequent earthquake,the grotto's maximum acceleration and displacement responses were 3. 94 m/s2 and 13mm, respectively. Under the effect of rare earthquake,the grotto's maximum acceleration and displacement responses were 18. 41 m/s2 and 66mm, respectively. Based on the seismic response of grottoes, three suggestions are put forward, including paying attention to the response of vulnerable parts of grottoes under the effect of earthquake, and strengthening seismic and artificial vibration monitoring of grottoes, in order to provide technical support for further monitoring and preventive protection of grottoes.
万方数据
维普
