砖石古塔的动力特性分析模拟及抗震性能评估

Analysis and simulation of dynamic behavior and seismic performance of ancient masonry tower

为了模拟泉州六胜古塔的结构动力特性,进而评估其抗震性能。采用时域分析与频域分析方法对古塔结构的脉动和爆破观测数据进行处理,计算分析了古塔结构的动力特性;创建古塔有限元结构模型,通过拟合实测与理论计算爆破波加速度时程进一步验证有限元模型的准确性,并运用有限元模型分析了古塔的结构动力响应。研究结果表明:在地震力作用下,古塔第四层和第五层的层间位移角有较显著突变现象,且在应力分析过程中,此两层的梁体出现明显拉应力,这为古塔的抗震加固提供了有利参考。

To simulate the structural dynamic characteristics and evaluate the seismic performance of Liusheng ancient tower in Quanzhou accurately,time domain analysis and frequency domain analysis method were used to process the environmental random records and blasting records,then the dynamic characteristic parameters of this tower was calculated.The finite element model of the tower was built,then the accuracy of the three-dimensional model was improved by fitting acceleration versus time of the measured and theoretical blasting data,and the finite element model was used to assess the seismic performance of this ancient tower.The results show that the displacement angle of the 4th and 5th storey of the tower has significant mutations under the seismic force,and significant tensile stresses appear in the beams of the two storeys in the process of stress analysis,which provides useful references for the seismic resistance of the ancient tower.