全局迭代的实时子结构试验方法及其验证

发布时间：2019-07-09 16:21

【摘要】：针对传统实时子结构试验方法存在数值积分稳定性和伺服加载时滞等问题,提出了全局迭代的实时子结构试验方法。该方法的数值计算和试验加载分别在动力荷载地震作用时间段内独立进行,它们之间传递整个时间段的位移计算结果或试验恢复力,迭代进行;中间子时间步不存在数据交互,这就避免了对数值积分方法显式格式和稳定性及精度的苛刻要求,伺服加载的时滞效应也不存在。以高速铁路32 m常用跨径简支梁桥的简化模型为例,对所提试验方法进行了验证。结果表明随着迭代的进行,试验趋于收敛。经过5次迭代之后,不同工况的收敛指标值均小于2%,满足工程精度要求。进一步分析了数值模型初始误差对迭代次数的影响,结果表明,初始误差越小,迭代收敛的速度越快,达到误差限值所需的迭代次数越少。最后指出了本文方法的适用范围。本文所提全局迭代的实时子结构试验方法是可行和有效的,将为工程结构的试验提供新的有效途径。
[Abstract]:In order to solve the problems of numerical integral stability and servo loading delay in traditional real-time substructure test methods, a global iterative real-time substructure test method is proposed. The numerical calculation and experimental loading of this method are carried out independently in the seismic action time period of dynamic load, and the displacement calculation results or experimental restoring force of the whole time period are transferred between them and carried out iteratively. There is no data interaction in the intermediate time step, which avoids the strict requirements for the explicit scheme and stability and accuracy of the numerical integration method, and the time delay effect of servo loading does not exist. Taking the simplified model of 32 m span simply supported beam bridge for high speed railway as an example, the proposed test method is verified. The results show that the experiment tends to converge with the iteration. After five iterations, the convergence index values of different working conditions are less than 2%, which meets the requirements of engineering accuracy. The influence of the initial error of the numerical model on the number of iterations is further analyzed. the results show that the smaller the initial error is, the faster the convergence speed of the iteration is, and the less the number of iterations needed to reach the error limit is. Finally, the applicable scope of this method is pointed out. The global iterative real-time substructure test method proposed in this paper is feasible and effective, and will provide a new and effective way for the test of engineering structures.
【作者单位】：石家庄铁道大学土木工程学院;石家庄铁道大学河北省大型结构健康诊断与控制重点实验室;河北省减隔震技术与装置工程技术研究中心;
【分类号】：U442.5

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