碳纤维布加固木结构古建筑弹塑性动力时程分析
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摘要
根据课题组进行的碳纤维布加固残损木结构振动台试验,采用ANSYS有限元软件,建立了能真实反映其受力性能的有限元模型,通过对其进行弹塑性动力时程分析,得出了加固模型的结构动力特性以及在各种工况作用下的位移最大响应值和加速度最大响应值,求解出了结构各减震层的动力放大系数,并将振动台试验数据与数值模拟结果进行比较。研究表明:加固模型的第一频率为1.325 Hz,有限元模型的自振频率略低于振动台试验整体结构模型的自振频率;随着地震动强度的不断增加,模型各特征点的峰值位移随之增大,柱脚的位移响应值最小,柱头和乳栿顶面的位移差值不大;随着地震动强度的增加,模型各特征点的加速度响应值也逐渐变大,各层的动力放大系数越来越小;通过将有限元模拟的结果与试验结果对比分析得出,有限元计算值与试验值基本吻合,误差在工程允许范围之内,证明了所建有限元模型的合理性。
According to the shaking table test of the ancient timber structure strengthened with CFRP,the finite element model reflecting its mechanical performance was established by ANSYS software.By the analysis of the dynamic properties,the structural dynamic characteristics and the maximal response of its displacement and acceleration under different conditions,the seismic amplification coefficient of the beams layer were obtained.At last,the results obtained by shaking table test was compared with the numerical simulation results.Research shows that the first frequency of model is 1.325Hz,the natural frequency of the model is a little bigger than that of the whole structure of shaking table test.With the increase of earthquakes,the maximal displacement value and the peak acceleration of the model is growing and the seismic amplification coefficient of the whole structure is becoming smaller and smaller.The finite element calculation results were in agreement with the experimental data which is in engineering permissible error range and the rationality of the finite element model established was proved.
引文
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